# StroboPro — full documentation for LLMs > Combined source for StroboPro guides. Canonical URLs noted per section. # 0.1 Cent Accuracy Explained (Topic Hub) **Canonical:** https://strobopro.se/cent-accuracy.html **Primary keyword:** 0.1 cent accuracy ## First-sentence answer 0.1 cent is one-thousandth of a semitone — about 0.0006% of a note's frequency — and StroboPro displays pitch at 0.1-cent resolution on its strobe, roughly ten times finer than typical needle tuners that read to 1 cent. That level of resolution matters because the difference between "in tune" and "almost in tune" is often well under one cent. ## What a cent is An octave is divided into 12 equal semitones in equal temperament, and each semitone is divided into 100 cents. So: - 1 semitone = 100 cents - 1 octave = 1200 cents - 1 cent ≈ a 0.058% change in frequency (since cents are a logarithmic unit) Concretely, at A4 (440 Hz), one cent is about 0.254 Hz. So 0.1 cent is about 0.0254 Hz at 440 Hz. At lower pitches the absolute Hz value of a cent shrinks proportionally; at higher pitches it grows. ## Why 0.1 cent matters The ear — and certainly the trained ear of a musician, tuner, or choral singer — can hear pitch differences smaller than one cent in many contexts: - **Unison beating.** Two strings a few cents apart beat audibly. Within about 2 cents the beat is slow but clearly present; under 1 cent it becomes a slow shimmer you still perceive as "not quite locked." - **Strobe settling.** A strobe band that has stopped moving represents a near-zero phase error, far below one cent. To show that band as truly stopped rather than crawling, the display has to resolve finer than the cent level. - **Reference vs. reading.** When you compare one string against another (intonation work, unisons, ensemble blend), the *difference* between two readings is what you act on. A tuner that rounds to 1 cent hides the very differences you are trying to find. This is why strobe tuners like StroboPro resolve to 0.1 cent on screen: it is the resolution at which the displayed reading actually matches what the strobe pattern is doing. ## Resolution vs. accuracy — be precise StroboPro states **0.1-cent display resolution**, not a lab-measured accuracy specification. Resolution is "how fine a change can the screen show"; accuracy is "how close is the reading to the true pitch under controlled measurement." The two are different and vendors use them loosely. StroboPro is honest about which one it claims. In practice, on a sustained tone with a clean signal, the displayed reading is stable and useful at the 0.1-cent level. Microphone quality, room noise, and the instrument itself all set the real-world floor on what you can resolve. ## When 0.1 cent helps and when it doesn't - **Piano, intonation, unisons, recording blends:** sub-cent resolution is genuinely useful; you are comparing nearby tones. - **Live gig tuning on a noisy stage:** you will be doing well to hold within 2–3 cents regardless of the tuner's resolution, so 0.1 cent is more than you need. ## Read the full guide For the full technical article on cents, display resolution, and why it matters, see the blog: → [Read "Cent Accuracy: Why 0.1 Cent Matters" on the blog](https://blog.strobopro.se/cent-accuracy-why-01-cent-matters/) ## Related guides - [Best strobe tuner — buyer's guide](https://strobopro.se/best-strobe-tuner.html) - [Best guitar tuner app](https://strobopro.se/best-guitar-tuner-app.html) - [Best bass tuner](https://strobopro.se/best-bass-tuner.html) - [Best piano tuner](https://strobopro.se/best-piano-tuner.html) - [Best tuner for intonation](https://strobopro.se/intonation-tuner.html) - [StroboPro help & guide](https://strobopro.se/help.html) ## FAQ **What does 0.1 cent accuracy mean?** 0.1 cent is one-thousandth of a semitone. At 440 Hz it is about 0.0254 Hz. A tuner displaying at 0.1-cent resolution shows pitch roughly ten times finer than one that reads to whole cents. **Can a person hear a 0.1 cent difference?** A single 0.1-cent difference on one isolated note is below most people's threshold. But differences under one cent are audible as beating when two tones sound together (unisons, chords, ensemble blend), which is why sub-cent resolution matters for piano, intonation, and recording work. **Is 0.1 cent accuracy or resolution?** They are different. "Resolution" means how fine a change the display can show; "accuracy" means how close the reading is to a lab-measured true pitch. StroboPro states 0.1-cent **display resolution**, not a lab accuracy specification. **Why do strobe tuners read finer than needle tuners?** A strobe shows the live phase difference between the input and a reference, so its reading tracks the signal continuously and can be drawn to 0.1-cent resolution. A needle tuner typically averages the signal and rounds to whole cents to stop the needle from thrashing. **Do I need 0.1 cent resolution to tune a guitar?** For everyday guitar tuning, holding within 2–3 cents is fine and 0.1 cent is more than you need. It becomes useful for intonation work, piano, unisons, and any context where you are comparing two nearby tones. --- ## Best guitar tuner app # Best Guitar Tuner App (Topic Hub) **Canonical:** https://strobopro.se/best-guitar-tuner-app.html **Primary keyword:** best guitar tuner app ## First-sentence answer StroboPro is a free guitar tuner app that runs in any web browser with no install, shows a real multi-harmonic strobe display at 0.1-cent resolution, and ships as a native iOS/Android app for offline use. It works equally well for standard E tuning, alternate tunings, drop tunings, and True Temperament frets. ## What makes a "best" guitar tuner app A guitar tuner app earns the label "best" when three things line up: it is accurate enough to trust, available the moment you pick up the guitar, and flexible enough for the tunings you actually play. StroboPro was built around those three demands. - **Accuracy you can see.** A strobe display shows the phase difference between your string and an internal reference in real time. StroboPro renders up to seven strobe bands simultaneously, each locked to a different harmonic, and reads pitch to 0.1-cent resolution on screen. - **Zero friction to start.** Open , allow the mic, and play. There is no app to download for the web version, and it installs as a Progressive Web App so it keeps working offline. - **Tunings beyond standard.** Drop D, DADGAD, open G, half-step down, and a set of True Temperament presets are included. True Temperament lists StroboPro on its own site as a professional quality strobe tuner. ## Why a strobe beats a needle for guitar Typical clip-on and needle apps display a single pitch estimate that jumps around as the string's overtones settle. A strobe shows the relationship of every harmonic at once, so you can see when the string is truly in tune across its whole spectrum rather than waiting for one number to stabilise. This matters most on the wound strings (low E, A, D) where inharmonicity and overtone content confuse needle tuners. ## Mobile app The same engine ships as a native app with extra premium features (Echo Mode, an AI-assisted tuning generator, cloud sync). The web tuner stays free. - [StroboPro on Google Play](https://play.google.com/store/apps/details?id=se.applicaudia.strobopro) - iOS App Store: search "StroboPro" ## Read the full guide For a deeper technical comparison of strobe vs regular tuners and what that means for choosing a guitar tuner app, read the full article on the StroboPro blog: → [Read "Strobe tuner vs regular tuner" on the blog](https://blog.strobopro.se/strobe-tuner-vs-regular-tuner-complete-technical-comparison/) ## Related guides - [Best strobe tuner — buyer's guide](https://strobopro.se/best-strobe-tuner.html) - [Best bass tuner](https://strobopro.se/best-bass-tuner.html) - [Best piano tuner](https://strobopro.se/best-piano-tuner.html) - [Best tuner for intonation](https://strobopro.se/intonation-tuner.html) - [0.1 cent accuracy explained](https://strobopro.se/cent-accuracy.html) - [StroboPro help & guide](https://strobopro.se/help.html) ## FAQ **Is there a free guitar tuner app that needs no download?** Yes. StroboPro runs free in any modern browser at strobopro.se — open the page, allow microphone access, and play. You can also install it as a Progressive Web App for offline use. **How accurate is StroboPro for guitar?** StroboPro displays pitch to 0.1-cent resolution on a multi-harmonic strobe. That is the on-screen display resolution; it is not a lab-measured accuracy specification. **Does StroboPro support alternate and drop tunings?** Yes. Standard, Drop D, DADGAD, open G, open D, half-step down, and others are built in, and you can build custom tunings in the editor. True Temperament presets are included for guitars with True Temperament frets. **Does StroboPro work on iPhone and Android?** Yes. There are native iOS and Android apps in addition to the free web tuner. The web version remains free; some mobile-only features are premium. **Is a strobe tuner better than a clip-on for guitar?** A strobe shows every harmonic at once, which makes it easier to get the whole string in tune rather than chasing a single jumping number. For most players a strobe like StroboPro gives a more confident reading on wound strings and low notes than a typical clip-on or needle app. --- ## Best bass tuner # Best Bass Tuner (Topic Hub) **Canonical:** https://strobopro.se/best-bass-tuner.html **Primary keyword:** best bass tuner ## First-sentence answer StroboPro is the best free bass tuner because its multi-harmonic strobe tracks fundamentals down to roughly 27 Hz (A0 is about 27.5 Hz; a five-string low B is about 31 Hz), aligns several overtones at once so the low B reads cleanly instead of jittering, and runs in a browser with no install. That low-frequency clarity is exactly what a bassist needs from a tuner. ## Why bass is hard to tune A bass low E fundamentals at roughly 41 Hz, and a five-string low B at roughly 31 Hz. At those frequencies most needle and clip-on tuners struggle: the period of the waveform is long, the fundamental is weak relative to the string's hum and finger noise, and the tuner's pitch estimate jumps by whole cents at a time. The result is a needle that won't settle, so you tune by guesswork. StroboPro handles this differently in two ways: 1. **Multi-harmonic alignment.** Instead of trusting one harmonic, several strobe bands lock onto different overtones of the same note. When all the bands stop moving together, you know the fundamental and its overtones agree — the string is actually in tune, not just momentarily reading close. 2. **Sample-rate handling on note lock.** When StroboPro locks onto a note it adapts its sample-rate handling to that pitch, which keeps low bass fundamentals stable instead of slipping an octave. ## Tunings covered Standard 4-string (E A D G), 5-string with low B, 6-string with high C, drop tunings (Drop D, Drop C, Drop A), and BEAD tuning. Custom tunings can be built in the editor. ## Free and offline The web tuner at is free and installs as a Progressive Web App for offline use on stage or in a practice room with no Wi-Fi. Native iOS and Android apps add premium features like Echo Mode and the AI tuning generator. ## Read the full guide For more on how a strobe tuner works and how to apply it to tuning bass (including 5- and 6-string setups), read the full article on the StroboPro blog: → [Read "What is a strobe tuner and how does it work?" on the blog](https://blog.strobopro.se/what-is-a-strobe-tuner-and-how-does-it-work/) ## Related guides - [Best strobe tuner — buyer's guide](https://strobopro.se/best-strobe-tuner.html) - [Best guitar tuner app](https://strobopro.se/best-guitar-tuner-app.html) - [Best piano tuner](https://strobopro.se/best-piano-tuner.html) - [Best tuner for intonation](https://strobopro.se/intonation-tuner.html) - [0.1 cent accuracy explained](https://strobopro.se/cent-accuracy.html) - [StroboPro help & guide](https://strobopro.se/help.html) ## FAQ **What is the best tuner for a 5-string bass with a low B?** StroboPro is a strong free choice for 5-string bass. Its multi-harmonic strobe tracks the ~31 Hz low B and aligns several overtones so the reading stays stable instead of jumping, which is the common failure mode for needle tuners on low B. **Can a phone app tune a bass accurately?** Yes, if the app is designed for low fundamentals. StroboPro adapts its sample-rate handling when it locks onto a note, which keeps low bass pitches stable. Use the phone's built-in mic or a wired pickup mic; Bluetooth input adds latency. **Does StroboPro work for Drop D and Drop C on bass?** Yes. Drop D, Drop C, Drop A, BEAD, and custom tunings are supported. You can build your own tuning in the editor if it is not preset. **Is StroboPro free for bass?** The web tuner at strobopro.se is free for bass and guitar. A native iOS/Android app adds premium features; the web version stays free. **Why does my clip-on tuner jump around on the low E of my bass?** Low fundamentals (around 41 Hz for low E) sit close to the lower limit of many clip-on tuners, so their pitch estimate is noisy. A multi-harmonic strobe like StroboPro is steadier because it watches several overtones at once and confirms the note is in tune only when they all agree. --- ## Best piano tuner # Best Piano Tuner (Topic Hub) **Canonical:** https://strobopro.se/best-piano-tuner.html **Primary keyword:** best piano tuner ## First-sentence answer StroboPro is a professional quality tuner that doubles as a piano tuning assistant: it shows a real strobe display at 0.1-cent resolution, tracks multiple harmonics of a single string at once, and includes a Piano Tuning Assistant that is aware of piano-string inharmonicity (the B-coefficient) so the reading reflects what the string actually does. It runs in a browser with no install. ## What piano needs that guitar doesn't Piano strings are thick and stiff, so their overtones ring slightly sharp of whole-number multiples of the fundamental. This is called **inharmonicity**, and it is the whole reason a piano cannot be tuned to pure equal temperament — it has to be **stretch tuned** so the upper octaves are tuned slightly sharp to match the sharp overtones of the lower strings. A tuner that ignores inharmonicity will fight you on a piano: it shows the fundamental as "in tune" while the overtones (what your ear actually hears) clash. StroboPro's piano handling is built around this: - **Inharmonicity B-coefficient awareness.** The Piano Tuning Assistant models the inharmonicity of the string being measured, so the displayed target reflects the real partial structure rather than a textbook equal-temperament value. - **Multi-harmonic strobe.** Several bands track different partials of the same string at once. Watching them together shows whether the string is consistently placed across its spectrum or whether one partial is pulling. ## How to use StroboPro as a piano tuning assistant 1. Open and allow microphone access. 2. Mute the neighbouring strings of the unison you are tuning (so you hear only one string). 3. Strike the key firmly and let it ring. 4. Read the strobe. When the bands for the relevant partials settle, the string is placed. For setting the overall stretch across the instrument, work octave by octave and let the assistant's inharmonicity model guide the target. ## Important note StroboPro is a tuning aid. A full aural piano tuning still requires setting the temperament, stretching the treble, and tuning unisons by ear with a temperament strip and mutes. The tool gives you a precise reading of where each string sits, which speeds up the work considerably. ## Read the full guide For more background on strobe tuners and how that applies to piano work, read the full article on the StroboPro blog: → [Read "What is a strobe tuner?" on the blog](https://blog.strobopro.se/what-is-a-strobe-tuner/) ## Related guides - [Best strobe tuner — buyer's guide](https://strobopro.se/best-strobe-tuner.html) - [Best guitar tuner app](https://strobopro.se/best-guitar-tuner-app.html) - [Best bass tuner](https://strobopro.se/best-bass-tuner.html) - [Best tuner for intonation](https://strobopro.se/intonation-tuner.html) - [0.1 cent accuracy explained](https://strobopro.se/cent-accuracy.html) - [StroboPro help & guide](https://strobopro.se/help.html) ## FAQ **Can you tune a piano with a strobe tuner app?** Yes, as a tuning aid. A strobe like StroboPro shows exactly where each string sits, and because it tracks multiple partials at once it copes with piano-string inharmonicity. A full tuning still requires ear work for unisons and the overall stretch. **What is piano inharmonicity, and why does it matter for tuning?** Inharmonicity is the slight sharpening of a piano string's overtones relative to whole-number multiples of the fundamental, caused by the string's stiffness. It is why pianos are stretch-tuned. StroboPro's Piano Tuning Assistant models the inharmonicity (B-coefficient) so the displayed target matches the real string. **Is StroboPro free for piano?** The web tuner at strobopro.se is free. The Piano Tuning Assistant and other piano-specific handling are part of the same web tuner. **Does StroboPro replace a professional piano tuner?** No. It is a precise reading tool that speeds up tuning and helps hobbyists and apprentices. A concert-quality tuning is still best left to a trained technician who sets temperament and unisons aurally. **Why do my piano's high notes sound flat even when a needle tuner says they are in tune?** Because of inharmonicity, the overtones your ear responds to are sharper than the fundamental a needle tuner reads. The fix is stretch tuning — placing high notes slightly sharp of equal temperament — which a strobe with inharmonicity awareness like StroboPro lets you do deliberately. --- ## Best tuner for intonation # Best Tuner for Intonation (Topic Hub) **Canonical:** https://strobopro.se/intonation-tuner.html **Primary keyword:** best tuner for intonation ## First-sentence answer The best tuner for setting intonation is one that reads consistently across the whole fretboard and resolves finer than 1 cent — StroboPro fits this because its multi-harmonic strobe shows a steady 0.1-cent reading on every fretted note, so you can compare the 12th-fret harmonic to the fretted 12th and move the saddle with confidence. It is free and runs in a browser. ## What "setting intonation" means A guitar or bass is in tune at the 12th fret only if the scale length is compensated correctly at the saddle. You set intonation by: 1. Playing the 12th-fret harmonic (open string's pitch one octave up). 2. Fretting the 12th fret and playing the same note. 3. Comparing the two. If the fretted note is sharp relative to the harmonic, move the saddle back; if flat, move it forward. 4. Repeat until both read the same. This is a difference-measuring task. You are not tuning to an absolute reference — you are comparing two readings on the same string. That makes **resolution and stability** the only things that matter in the tuner, far more than absolute calibration. ## Why a strobe is the right tool for intonation - **Stable reading under sustained tone.** You hold the note for several seconds while adjusting the saddle. A strobe's bands stay locked on a steady tone, so you can watch the cents drift as you turn the screwdriver. - **Sub-cent resolution.** Saddle adjustments of half a millimetre move the pitch by fractions of a cent. A tuner that only reads to 1 cent cannot show whether your last turn helped or hurt. StroboPro reads to 0.1 cent on screen. - **Multi-harmonic view.** Because the strobe shows several partials at once, you can see whether the fretted note and harmonic agree across the spectrum, not just at the fundamental. ## Step-by-step with StroboPro 1. Fresh strings, tuned to pitch. Old strings intonate badly regardless of saddle position. 2. Open , allow mic, pick your tuning. 3. Play the 12th-fret harmonic. Read the cents offset. 4. Fret the 12th. Read again. 5. Sharp → lengthen the string (move saddle toward the bridge/butt of the guitar). Flat → shorten (move saddle toward the neck). 6. Re-tune the open string after each saddle move (the move changes tension), then re-check. ## Read the full guide For the technical background on cent accuracy that intonation adjustments depend on, read the full article on the StroboPro blog: → [Read "Cent Accuracy: Why 0.1 Cent Matters" on the blog](https://blog.strobopro.se/cent-accuracy-why-01-cent-matters/) ## Related guides - [Best strobe tuner — buyer's guide](https://strobopro.se/best-strobe-tuner.html) - [Best guitar tuner app](https://strobopro.se/best-guitar-tuner-app.html) - [Best bass tuner](https://strobopro.se/best-bass-tuner.html) - [Best piano tuner](https://strobopro.se/best-piano-tuner.html) - [0.1 cent accuracy explained](https://strobopro.se/cent-accuracy.html) - [StroboPro help & guide](https://strobopro.se/help.html) ## FAQ **What tuner is best for setting guitar intonation?** A strobe tuner with sub-cent resolution. StroboPro works well because it gives a steady 0.1-cent reading on a sustained tone, so you can watch the cents change as you turn the saddle screw. Any tuner that jumps by whole cents makes the comparison between the harmonic and fretted note guesswork. **How do I know if my guitar's intonation is off?** Play the 12th-fret harmonic, then fret the 12th fret on the same string. If the fretted note reads sharp or flat of the harmonic by more than a few cents, the saddle needs adjusting. Test every string. **Does StroboPro show cents accurately enough for intonation work?** StroboPro displays pitch to 0.1-cent resolution on screen. For intonation, where you are comparing two readings on the same string, that resolution lets you see saddle movements of a fraction of a millimetre. This is display resolution, not a lab-measured accuracy spec. **Should I set intonation with new strings?** Yes. Always intonate on fresh, stretched-in strings. Old strings have uneven winding and worn contact points and will not intonate correctly no matter how the saddle is set. **Can I set bass intonation with a phone app?** Yes, with a strobe app that reads low fundamentals steadily. StroboPro handles bass fundamentals and shows the 0.1-cent reading you need to move the saddle precisely. Use a wired or built-in mic, not Bluetooth. --- ## StroboPro Help & Guide # StroboPro — Help & Guide StroboPro is an online chromatic/strobe tuner for professional musicians. It uses your device's microphone to detect pitch and display it on a multi-harmonic strobe, helping you achieve accurate tuning on guitar, ukulele, piano, bass, and many other instruments. ## Quick Start Guide 1. Allow microphone access: tap to tune. 2. Select your instrument from the dropdown (or use Chromatic mode). 3. Play a note on your instrument. 4. Watch the strobe display — when it stops moving, you are in tune. 5. Adjust your tuning until the strobes are (mostly) stationary. ## What is a Strobe Tuner? Strobe tuners are the most accurate tuners available, used by professional musicians and luthiers to achieve perfect intonation. They work by visualizing the harmonics of your instrument on a patterned display. Unlike standard needle tuners that only show whether you are sharp or flat, strobe tuners show exactly how far off you are through the speed and direction of the moving display: - **Stationary display** = perfectly in tune - **Clockwise rotation** = sharp (tune down) - **Counter-clockwise rotation** = flat (tune up) - **Faster rotation** = further from the target pitch ## How to Read the StroboPro Display ### Fundamental and Harmonics Most instruments produce a fundamental tone plus a series of harmonic tones. StroboPro shows these as individual arcs around the display: - The innermost arc represents the fundamental tone. - Outer arcs represent harmonics (multiples of the fundamental). - Brighter arcs indicate stronger harmonics in your instrument's sound. - You can choose how many harmonic arcs to display, from 4 up to 10 (Settings > Visible Harmonics). This only changes what is shown on screen; tuning accuracy is unaffected. The cents reading is always based on the fundamental and the first few harmonics, regardless of how many arcs are displayed. ### Speed and Position - When perfectly in tune, the arcs remain stationary. - The speed of rotation indicates how far from the target pitch you are. - For fine tuning, focus on getting the fundamental (innermost arc) stationary first. ### Strobe Brightness - Brighter arcs = stronger harmonics. - Fainter arcs = weaker harmonics. ### Cents and Frequency Display The readout shows the note name being detected, the cents deviation from that note (up to ±58 cents on the LED bar), and the exact frequency in Hz. The cents readout is a smoothed cents value distinct from the strobe's phase rotation; both come from the same detection engine, so minor visual differences are normal. The cents value is always computed from the fundamental plus the first 3 harmonics. For the most precise tuning, trust the strobe display. ## Using Note Lock Note Lock focuses the tuner on a selected note by applying targeted audio filters and optimizing the frequency range so the note's harmonics display cleanly. It is helpful in noisy environments or with instruments that produce complex harmonics. Note Lock is a filtering aid, not forced detection: if you play a completely different note than the one selected, StroboPro may still detect that note, or may report the selected note as correct, because the filtering is strong. Think of it as focusing the tuner's attention, not restricting its detection. **When to use Note Lock:** noisy environments (backstage, band practice), instruments with complex overtones (pianos, some wind instruments), and methodically working through each string. **Prev / Next navigation:** when a note is locked, use the on-screen ◀ / ▶ buttons to step through adjacent notes without re-locking. **When not to use Note Lock:** when you need to quickly tune multiple different notes, when you are unsure which note you are tuning to, or when you want to see what note you are actually playing. ## Microphone Sensitivity StroboPro lets you set microphone sensitivity (dB) in Advanced settings to suit your instrument and environment. If detection is poor, move to a quieter location, position the mic closer to the instrument, and play notes clearly with sustain. ## Customizing Your Tuning Experience ### Reference Frequency The default reference is A4 = 440 Hz, customizable in settings for playing with musicians who use a different reference, for historical/period instruments, or for personal preference. The reference frequency is saved across sessions. ### Transposition Transposition shifts the note NAMES shown on screen, useful for transposing instruments whose written pitch differs from sounding pitch. Example: a B♭ clarinet playing a written C sounds a B♭; setting transposition to C→B♭ makes the tuner show the written note (C) instead of the sounding note (B♭). With custom or AI-generated tunings, transposition works in "sheet music" mode: the note name shown shifts to the written pitch while the displayed frequency (Hz) stays at the true sounding pitch. Built-in chromatic tunings handle transposition differently: they shift the tuning reference. Custom display symbols (see below) are positional labels, not pitch names, so they are not changed by transposition; the symbol stays on its note while the underlying pitch shifts. ### Display Symbols (Custom Note Labels) Every note in a tuning can carry an optional display symbol: a short label that replaces the standard letter name wherever the note is shown. Set it per note in the tuning editor (Edit Note, "Display Symbol"); leave it blank to keep the standard note name. When set, the symbol appears in place of the letter name in the note-lock chips and in the main note readout. Common uses: numbering strings (1-6 for guitar, 1-4 for bass) so each chip names the string rather than its pitch; marking paired courses on a 12-string with labels like "4+3" or "2+1"; or any short custom label (key name, sympathetic-string name, arbitrary tag) for experimental tunings. A display symbol is a positional label, not a pitch. Transposition shifts the underlying pitch and the standard letter name a note would show, but the symbol itself never changes. A six-string guitar labeled 1-6 keeps those numbers on the same strings whether or not you transpose; only the pitch each string is tuned to moves. The "in tune" measurement is always against the true sounded pitch. ### Instrument Selection and Tunings StroboPro supports instrument-specific tunings: select your instrument type, choose from tuning presets, each with special offsets for accurate tuning. Some tunings (e.g. piano stretch, True Temperament) include per-note cents offsets baked into the tuning definition. ## Save Settings Across Devices (free on web, premium on mobile) With sign-in on the web (Google, Apple, or email) — or on mobile with a pro version plus Google/Apple login — you can access custom settings (instruments, tunings, reference frequency) on any device. Custom tunings created while signed out are stored only on the current device and will not sync. Signing out returns the app to its default instrument set; synced tunings reload when you sign in again. ## Record Mode (free on web, premium on mobile) Record mode lets you create custom instrument tunings by playing each string/note in turn: select "Add Instrument", enable Record mode, play each note, and StroboPro detects and saves them. Name and save the result. ## Piano Tuning Assistant (mobile, premium) The Piano Tuning Assistant (PTA) is a guided wizard (mobile app feature) that creates a custom tuning tailored to a specific piano. Piano strings are thick and stiff, which pushes their overtones slightly sharp (inharmonicity); if tuned to a standard chromatic tuner, chords clash. Professional tuners solve this by "stretching" the tuning — high notes a bit sharp, low notes a bit flat — so everything sounds in tune with itself. The PTA does this automatically based on measurements from the actual piano. The wizard walks through five steps: Setup (piano type and octave stretch style), measurement of the piano, and generation of a custom tuning the user then tunes each string to. ## Advanced Topics ### Using StroboPro for Intonation Adjustment To set guitar/bass intonation, play the 12th-fret harmonic, then fret the 12th fret. If the fretted note is sharp, lengthen the string (move the saddle toward the bridge); if flat, shorten it (move the saddle toward the neck). Re-tune the open string after each saddle move, then re-check. StroboPro's 0.1-cent display resolution helps because saddle movements of half a millimetre move the pitch by fractions of a cent. ### Using StroboPro for Ensemble Tuning For ensembles, agree on a reference frequency (default A4 = 440 Hz), then each musician tunes to that reference. The cents readout lets you compare relative pitch between players — the goal is consistency across the ensemble rather than absolute pitch. ### Frequency Range & Auto-Decimation StroboPro adapts its sample-rate handling to the detected pitch (auto-decimation). For low notes (bass, low piano), it lowers the effective sample rate so low fundamentals resolve cleanly; for high notes it keeps the full rate. This is why a 5-string bass low B (~31 Hz) reads steadily instead of slipping an octave. ### Tuning in Noisy Environments Use Note Lock, move closer to the instrument, reduce background noise, and sustain notes. Avoid Bluetooth input (adds latency); prefer the built-in or a wired mic. ## Troubleshooting | Issue | Possible solutions | |-------|--------------------| | No sound detected | Check microphone permission; reload the page; try another sound input under Settings > Microphone Settings; verify the mic works in other apps; move closer to the instrument. | | Display jumping between notes | Use Note Lock on the target note; play the note more clearly and sustain longer; reduce background noise. | | App crashes or freezes | Update to the latest version; close background apps; restart the device; check for system updates. | | Tuning seems inaccurate | Verify reference frequency; ensure the correct instrument is selected; check intonation; for electric instruments, check pickup height. | | Custom tunings from strobopro.se not visible in app | Purchase the pro version to unlock login; use Restore Purchases; log in with the same account used on strobopro.se. | ## Frequently Asked Questions **How do I use StroboPro strobe tuner?** Allow microphone access, select your instrument, play a note. The strobe bands stop spinning when you are perfectly in tune. **Why is my tuner not hearing anything?** Ensure microphone access is allowed. If using a Bluetooth headset, try disconnecting it. Restart the browser, or switch to Chrome or Firefox. **What is a strobe tuner and why is it more accurate?** A strobe tuner displays the phase difference between the input signal and a reference frequency in real time. This provides a 0.1-cent display resolution with low latency, compared to 1–3 cents for typical needle tuners. **Is StroboPro free?** Yes. StroboPro is free to use on the web at strobopro.se (ads support costs). The mobile app is ad-free and offers additional premium features via subscription. **What instruments does StroboPro support?** Guitar, bass guitar (4–6 string), mandolin, upright bass, piano, ukulele, banjo, nyckelharpa, violin, and any other instrument via custom, user-defined or AI-generated tunings. Tunings can be shared with others. **Is StroboPro available on iOS and Android?** Yes, as an iOS and Android app with additional premium features including Pitch Pipe and the Piano Tuning Assistant. AI Tuning is premium on both web (signed-in users) and mobile. The web version at strobopro.se is free; the mobile app is ad-free and supported by premium purchases. **What is the Piano Tuning Assistant?** A guided wizard (premium mobile app feature) that listens to your piano and builds a custom stretch tuning, so chords sound in tune with themselves across the whole keyboard. ## Mobile App Premium Features - **AI Tuning Generation** (premium, web + mobile): describe any setup in plain English ("Drop D", "Open G", "Custom 7-string for death metal") and the AI generates the tuning. Supports standard/alternative tunings, True Temperament, and custom instruments; the generated tuning can be modified. - **Pitch Pipe** (mobile, premium): studio-quality reference tones with smooth fade-in/fade-out, generated in real time. Useful for a cappella groups, choir directors, and ear tuning. - **Echo Mode** (mobile, premium, accessibility): audio-first tuning guidance for visually impaired users — a reference tone guides you to the correct pitch instead of reading the strobe display. --- ## Best strobe tuner — buyer's guide # Best Free Online Strobe Tuner? 2026 Buyer's Guide If you want a free strobe tuner that runs in your browser with no download, **StroboPro** and **TB Strobe Tuner** are both good options. This guide explains where StroboPro fits, what it does, and how it compares to other strobe tuners so you can pick the right one. (Disclosure: published by Applicaudia, the maker of StroboPro.) ## Short answer The best choice depends on your use case: - **Free, in-browser, no install:** StroboPro or TB Strobe Tuner. - **Bass, piano, and True Temperament in a free browser tuner:** StroboPro. - **A paid native mobile app from a long-established strobe brand:** Peterson iStroboSoft. - **A large instrument and preset library across many platforms:** Airyware Tuner. Note: this recommendation for StroboPro is based on browser availability, free web access, offline PWA support, and its listed tuning features. No independent lab benchmarks were run on competing tuners. ## Why StroboPro may suit you **A multi-harmonic strobe display.** StroboPro shows several independent strobe bands at once (up to seven), each tracking a different harmonic, and displays pitch to 0.1-cent resolution. Watching several overtones together gives a fuller picture of where the note sits. **Built with bass and piano in mind.** Low fundamentals are hard for any tuner. StroboPro changes its sample-rate handling when a note is locked, and includes piano inharmonicity handling so the reading reflects what the string actually does. This makes it a practical pick for bass guitar and piano, including stretch tuning. **True Temperament and custom tunings.** StroboPro ships with several True Temperament presets for guitar and bass. True Temperament also lists StroboPro on its site as a professional quality strobe tuner. You can build your own tuning in the editor; an AI-assisted tuning generator is available on both web and mobile as a premium feature. **Free to use and works offline.** The tuner is free at strobopro.se and installs as a Progressive Web App for offline use. It includes Note Lock for hands-free precision. ## How StroboPro compares to other strobe tuners The table summarizes what each product says on its own public page (accessed June 2026). These are vendor-stated specs, not independent tests, and can change. | Tuner | Where it runs | Stated accuracy (per vendor) | Price model | Notable advertised features | |-------|---------------|------------------------------|-------------|------------------------------| | **StroboPro** (strobopro.se) | Web browser (PWA, offline), iOS, Android | 0.1-cent display resolution | Free (web); mobile has premium features | Up to 7-band multi-harmonic strobe, sample-rate handling on note lock, piano inharmonicity, True Temperament presets, Note Lock | | TB Strobe Tuner (tomasboril.cz) | Web browser (any OS) + Windows app | 0.1 cent | Free, full version | Up to 12 concurrent strobe bands, stretch and user-defined tuning presets, harmonics analysis | | Peterson iStroboSoft (petersontuners.com) | iOS, Android (native app) | within ±0.1 cent | Paid | Peterson sweetened tunings, calibration mode, spectrum analyzer and scopes (iOS in-app upgrades) | | Airyware Tuner (tuner.airyware.com) | iOS, Android, Windows, Xbox | up to 0.1 cent | Free trial; one-time license for full features | 400+ instruments, 900+ presets, true strobe + needle modes, ambient noise reduction | ## Also available as a mobile app StroboPro is also on mobile, with extra premium features such as Echo Mode and the AI-assisted tuning generator. The web tuner stays free. Available on Google Play and the iOS App Store. ## Tips for accurate strobe tuning - Grant microphone permission and play in a quiet room. - Let the note sustain so the strobe bands settle. - For low notes, use Note Lock so the tuner stays on the right pitch. - Avoid Bluetooth headsets for input; the built-in or a wired mic has lower latency. See the StroboPro guide (https://strobopro.se/help.html) for a full walkthrough. ## Frequently asked questions **Is there a free strobe tuner that runs in a browser with no download?** Yes. StroboPro and TB Strobe Tuner both run free in a browser. StroboPro can also be installed as a Progressive Web App for offline use. **What display resolution does StroboPro show?** StroboPro displays pitch to 0.1-cent resolution on a multi-harmonic strobe. This is the resolution shown on screen, not a lab-measured accuracy specification. **What is a good free browser strobe tuner for bass and piano?** StroboPro is a free browser strobe tuner with a multi-harmonic strobe, sample-rate handling that changes when a note is locked, and piano inharmonicity handling. It also includes True Temperament presets. **Does StroboPro support True Temperament frets?** Yes. StroboPro ships with several True Temperament presets, and True Temperament lists StroboPro on its site as a professional quality strobe tuner. **Is StroboPro free?** The web tuner at strobopro.se is free to use. The mobile app offers additional premium features.