StroboPro is your go-to professional online chromatic/strobe tuner designed specifically for professional musicians. Whether you play the guitar, ukulele, piano, or any other instrument, StroboPro makes tuning a breeze. By utilizing your device's microphone, StroboPro accurately detects pitch and visually displays it, helping you achieve perfect harmony in your music.

StroboPro Online Tuner with Microphone Interface

Quick Start Guide

Allow microphone access when prompted
Select your instrument from the dropdown menu (or use Chromatic mode)
Play a note on your instrument
Watch the strobe display - when it stops moving, you're in tune!
Adjust your tuning until the strobes are (mostly) stationary

▶️ See StroboPro in action

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 if you're sharp or flat, strobe tuners show you 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

StroboPro brings this professional technology to your device, making it accessible and easy to use.

How to Read the StroboPro Display

Fundamental and Harmonics

Most instruments produce not just a single tone but 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

Speed and Position

The rotation of the arcs tells you how close you are to being in tune:

When perfectly in tune, the arcs will 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

The brightness of each arc indicates the strength of that harmonic in your instrument's sound:

Brighter arcs = Stronger harmonics
Fainter arcs = Weaker harmonics
This helps you identify which harmonics are most prominent in your instrument

Cents and Frequency Display

The digital display shows:

The note name being detected
Cents deviation from that note (±50 cents)
The exact frequency in Hz

Note: The cents display is calculated using a different method than the strobe display, so minor differences between the two are normal. For the most precise tuning, trust the strobe display.

Using Note-Lock Functionality

Pro Tip: Note-Lock helps you focus on tuning a specific note by adding filtering around your chosen note.

How Note-Lock Works

When you enable Note-Lock:

The tuner adds additional filtering focused around your selected note
This makes it easier to tune that specific note without jumping to other notes
It's especially helpful in noisy environments or with instruments that produce complex harmonics

Pro Tip: Note-Lock is a filtering aid, not forced detection:

If you're playing a completely different note than the one selected, StroboPro will still detect that different note
Note-Lock simply helps stabilize detection when you're playing close to the selected note
Think of it as "focusing" the tuner's attention, not restricting its detection

When to Use Note-Lock

When tuning in noisy environments (like backstage or in a band practice)
For instruments with complex overtones (like pianos or some wind instruments)
When methodically working through tuning each string or note

When Not to Use Note-Lock

When you need to quickly tune multiple different notes
If you're unsure which note you're trying to tune to
When you want to see what note you're actually playing

Fine-Tune with Microphone Sensitivity

StroboPro automatically adjusts its sensitivity to filter out background noise, focusing on your instrument's frequencies. This helps it lock onto the notes you play and ensures accurate tuning without interference from ambient sounds.

If you're experiencing issues with detection:

Move to a quieter location if possible
Position your device's microphone closer to your instrument
Play notes clearly and allow them to sustain

Customizing Your Tuning Experience

Reference Frequency Adjustment

The default reference frequency is A4 = 440Hz, but you can customize this in settings:

For playing with other musicians who use a different reference
For historical or period instruments that traditionally use different references
For personal preference or specific performance requirements

Your chosen reference frequency is automatically saved for your next session.

Instrument Selection and Tunings

StroboPro supports various instrument-specific tunings to match your needs:

Select your instrument type from the dropdown menu
Choose from various tuning presets for your instrument
Each instrument has special offsets to ensure accurate tuning

Pro Tip: For additional customization, you can set custom cents offset for your instrument in addition to the temperament cents offset for each note.

Save Your Settings Across Devices

With Google Login, you can access your custom settings on any device:

Your custom instruments and tunings
Reference frequency preferences

This ensures a consistent tuning experience no matter where you play.

Record Mode: Create Custom Tunings Easily

Record mode makes creating custom instrument tunings simple:

Select "Add Instrument" and enable Record mode
Play each string/note of your instrument one at a time
StroboPro automatically detects and saves each note
Name and save your custom instrument tuning

▶️ See Record Mode in action

Advanced Topics

Using StroboPro for Intonation Adjustment

Intonation is how well your instrument plays in tune across its entire range. Poor intonation means that even if individual strings are in tune, chords will sound out of tune in different positions.

For Electric and Acoustic Guitars

Prepare your instrument: First tune all strings to their correct pitch
Check open string: Play an open string and ensure it's in tune
Check 12th fret harmonic: Lightly touch the string directly above the 12th fret and pluck
Check 12th fret fretted note: Press the string down at the 12th fret and pluck
Compare: The harmonic and fretted note should both be in tune (stationary strobe)
Adjust: If the fretted note is sharp (clockwise motion), move the saddle away from the neck; if flat (counter-clockwise), move it toward the neck
Repeat: Re-tune the open string and check again until both match
Repeat for all strings: Follow the same process for each string

For Other Stringed Instruments

Similar principles apply to other stringed instruments, though adjustment methods vary by instrument type. The key is checking that notes played at specific intervals (like octaves) remain consistently in tune across the instrument's range.

Using StroboPro for Ensemble Tuning

When tuning multiple instruments to play together:

Establish a reference: Choose one well-tuned instrument as your ensemble reference
Match reference frequency: Ensure all StroboPro instances use the same reference frequency (e.g., A4=442Hz)
Tune in order: Start with bass instruments, then mid-range, then high-range
Check intervals: Play intervals between instruments (octaves, fifths) and ensure they sound consonant
Final check: Play a simple chord progression with all instruments to confirm ensemble tuning

This methodical approach ensures your ensemble will sound harmonious across all registers and instruments.

Troubleshooting Tips

Issue	Possible Solutions
No sound detected	Check that you've granted microphone access Try reloading the page Try to choose another sound input under Settings->Microphone Settings Check if your microphone is working in other applications Move closer to your instrument
Display jumping between different notes	Try using Note-Lock on your target note Play your note more clearly and sustain it longer Reduce background noise Make sure you're playing the note you think you are
Tuning seems inaccurate	Verify your reference frequency setting Ensure you've selected the correct instrument Check if you need to adjust intonation (see advanced topics) For electric instruments, check if pickups are too close to strings

StroboPro is now on iOS and Android!

StroboPro - The Most Accurate Online Strobe Tuner with Microphone