A free, ad-free chromatic tuner for the Greek bouzouki, built as a progressive web app. No account, no tracking, no install from a store — just open the page in your phone's browser and tune.
Supports both common Greek bouzouki tunings:
- Tetrachordo (4-strings) — C₃ F₃ A₃ D₄
- Trichordo (3-strings) — D₃ A₃ D₄
Open the live version on your phone:
→ https://sonapsav.github.io/bouzouki-tuner/
(you may replace the URL above with your actual GitHub Pages address once forked/published, otherwise you may use it as-is)
Allow microphone access when prompted, then pluck a string. That's it.
For the proper app experience (full-screen, own icon, launches like a native app):
- Android (Chrome): three-dot menu → Add to Home screen (or Install app if offered)
- iOS (Safari): share button → Add to Home Screen
AUTO mode (default). The tuner listens and tells you what note you're playing plus how far off you are from the nearest semitone. When a detected note happens to match one of your bouzouki strings in the current tuning, that string's pill gets a subtle gold highlight.
Manual mode. Tap any string pill (C₃, F₃, A₃, D₄) to lock the tuner onto that specific target. Useful when a string has drifted more than a semitone — in AUTO mode the tuner would confidently identify it as the wrong note, which is useless when you're trying to get back to the right one.
Reading the meter.
- Needle left of centre = flat, tighten the string
- Needle right of centre = sharp, loosen the string
- Within ±5 cents the display turns gold and a short haptic buzz confirms you're in tune
- The number below the arc is the exact deviation in cents (1/100th of a semitone)
Switch between Tetra and Tri tunings with the toggle in the top right.
Pitch detection uses ACF2+ autocorrelation (Chris Wilson's algorithm) with parabolic interpolation for sub-sample accuracy, over a 2048-sample window at whatever sample rate the browser provides (usually 44.1 or 48 kHz). This means it tracks the fundamental frequency reliably even when the bouzouki's sympathetic strings are ringing out and adding overtones.
The microphone is configured with echo cancellation, automatic gain control, and noise suppression all disabled — these are standard Web Audio defaults for voice calls but they mangle the signal for pitch tracking.
All processing is local to your phone. No audio ever leaves the device.
Fork this repo, enable GitHub Pages (Settings → Pages → Source: main branch, root folder), and your copy is live in about a minute at https://YOUR-USERNAME.github.io/YOUR-REPO-NAME/.
The entire app is four files:
index.html— the app itself (markup, styles, and pitch-detection logic all in one file)manifest.webmanifest— PWA metadataicon-192.png,icon-512.png— home-screen icons
To modify the tuner, edit index.html directly. To change the icon, replace the two PNGs with your own at the same dimensions and filenames.
The Web Audio microphone API (getUserMedia) requires an HTTPS connection. GitHub Pages provides HTTPS by default, so it works out of the box there. Opening the HTML file directly from your filesystem (file://) will not work for microphone access — you'll get permission errors.
Tested and working:
- Chrome / Edge on Android (recommended)
- Safari on iOS 14.5+
- Chrome, Firefox, Safari on desktop
Requires a browser with Web Audio API support, which means effectively anything from the last five years.
MIT — see LICENSE. Do whatever you want with it.
Made with love by Panos Vasilopoulos (sonapsav)