Free browser tuner
Best Ukulele Tuner? Free Strobe App for GCEA & Reentrant
Why the best ukulele tuner is chromatic
Standard reentrant GCEA tuning walks up, jumps down, then walks up again: the G is the highest string, the C drops below it, and the E and A climb back up. Tuners that only know one string at a time get confused when you cross strings, and guitar clip-ons often misread the bright upper partials of nylon and fluorocarbon.
A chromatic strobe sidesteps both. It listens for whatever pitch you play, in any order, and shows a multi-harmonic pattern that holds still when the note's in tune. StroboPro is fully chromatic - pick the ukulele preset and it locks onto each string without you telling it which one's next.
Reentrant vs linear tuning, and why it matters
Standard ukulele tuning is reentrant: the strings aren't in low-to-high order. The fourth string (G) sits an octave above where you'd expect, which gives the uke its chiming sound. Low G tuning swaps that for a G an octave lower so the four strings run in ascending order, like the top four strings of a guitar.
Both are correct - it's a style choice. Reentrant GCEA is the traditional Hawaiian voice; low G gives you more range for solo arrangements. Neither is harder to tune, but you do need a tuner that knows which G you mean, because mixing up the two octaves is the most common reason a uke "sounds wrong" after tuning.
StroboPro ships both: G4-C4-E4-A4 (reentrant) and G3-C4-E4-A4 (low G), plus A4-D4-F#4-B4 (D tuning) and DGBE (baritone).
Low tension quirks: why uke strings fight back
Nylon and fluorocarbon uke strings run at low tension compared to steel guitar strings, and that affects tuning in two ways.
First, the pitch changes more for a given peg tweak. A quarter-turn that nudges a guitar string by ten cents can move a uke string by thirty or forty, so a tuner that reads in whole-cent steps is too coarse and you overshoot. StroboPro reads to 0.1 cent on screen, so small peg movements show as a clear, slow drift on the harmonic rings instead of a needle flicking between two values.
Second, nylon keeps stretching for a week or two after you string the uke. During that window the tuning drifts flat while you play. A strobe shows the drift in real time so you can head it off.
How to tune a ukulele with a strobe
- Open standard GCEA tuning and tap Tap to Tune (the mic button). Allow microphone access when asked. (If you're on low G, D tuning, or baritone, switch to that preset.)
- Pluck the string, let it ring, then pluck again. The harmonic rings scroll when the note is off and stop when it's in tune.
- Rings scrolling up means flat; scrolling down means sharp.
- For reentrant tuning, remember the G is the high one. If your tuner reads an octave lower than expected on the G string, you're on the wrong preset or have a low-G string set on a reentrant uke.
- Re-check each string twice. New nylon drifts in the first minute after you tune it.
A quick word on the competition
A clip-on Snark is a fine gig-bag tuner and a lot of players keep one in the case. Where StroboPro differs is that it's a real strobe, not a needle dressed up to look like one, so it shows you the harmonic structure of the string instead of a single pitch estimate. It's also free on the web, so you can hand your phone to a friend at a campfire without them installing anything. More on how a strobe tuner works on the blog.
Free and offline
The web tuner installs as a PWA, so you can use it offline at a beach gig or in a school music room with no Wi-Fi. Native iOS and Android apps add premium features like the AI tuning generator (describe your tuning in plain English and it builds it) and Echo Mode for vision-impaired players.
Read "What is a strobe tuner and how does it work?" on the blog →Related guides
Frequently asked questions
What's the best ukulele tuner for a beginner?
A free chromatic tuner you don't have to install. StroboPro runs in a browser, picks the ukulele preset for you, and shows a strobe pattern that stops moving when the string's in tune - simpler to read than a needle swinging both ways. Open [standard GCEA](/preset/ukulele/4-string/standard) to start.
Is reentrant GCEA the same as low-G tuning?
No. Reentrant GCEA has a high G as the fourth string, an octave above where you'd expect. Low G swaps in a G an octave lower so the strings run in ascending order. Both are valid; reentrant is the traditional Hawaiian sound, low G is common for solo arrangements. StroboPro ships presets for both - open [standard GCEA](/preset/ukulele/4-string/standard) or switch to low G.
Can I tune a baritone ukulele with StroboPro?
Yes. Baritone ukes are usually tuned D-G-B-E, the same as the top four strings of a guitar. StroboPro has a baritone preset, and since it's chromatic it'll follow any alternate tuning you dial in.
Why does my ukulele go out of tune so quickly after I string it?
Nylon and fluorocarbon strings stretch for a week or two when new, so they drift flat while you play. Re-tune often during the first few sessions and check at the start of every practice for the first week. A strobe shows the drift clearly so you catch it before it gets bad.
Published by Applicaudia, the maker of StroboPro. Resolution figures describe the on-screen display, not lab-measured accuracy specifications. String and peg behaviour varies by instrument and string brand.
Open the free StroboPro tuner