Super Time Ultra
432 Hz Tuner
Free 432 Hz tuner for guitar, bass, ukulele, violin, voice, and any instrument. Starts with A4 set to 432 Hz, with live microphone pitch detection, cents feedback, and adjustable calibration.
This tuner opens with A4 set to 432 Hz, then uses your microphone to show the nearest note and cents deviation. You can change the calibration if your ensemble or recording uses a different reference.
What this online tuner includes
Microphone pitch detection
Play a note into your device microphone and watch the nearest pitch plus cents deviation.
Instrument presets
Tune standard guitar, bass, ukulele, violin, and full chromatic notes without installing an app.
432 Hz opening reference
A4 starts at 432 Hz so every detected note is judged against that reference. Change the value whenever you need another concert pitch.
Practice-suite workflow
Move from tuning into metronome, drone, rhythm, and printable practice tools in the same browser app.
How to use the online tuner
- Open the tuner and allow microphone access when your browser asks.
- Play one note or string clearly, then watch the detected note and cents meter.
- Tune slowly until the pitch is centered instead of chasing every tiny vibration.
- Start at A4 = 432 Hz, then adjust the calibration only if your ensemble uses another reference.
Online tuner tips
- Use a quiet room: background noise and sympathetic string vibration make any microphone tuner less stable.
- Tune up to pitch: if a string is sharp, loosen below the note and tighten back up for better tuning stability.
- Check after playing: tune again after bends, heavy strumming, capo changes, or temperature changes.
Keep the tuner free: Super Time Ultra is ad-free. The one-time Supporter Pass funds the tuner, metronome, polyrhythm generator, exports, and printable rhythm tools. Get Supporter Pass.