Guitar tuner with feelings
String Sensei
A real microphone tuner that tells you when your string is flat, perfect, or trying to flee the planet.
E2A2D3G3B3E4
Audio stays on your device
No account required
Secure browser tuning
Ready when you are
Start Tuning
Tap the button, allow microphone access, and play one string at a time.
Detected
-- Hz
Target
Auto
Difference
-- cents
Guided Check
Tune one string at a time
String Sensei will lock each string when it holds steady inside +/-5 cents.
Reference Tones
Tap a string to hear the target pitch.
Mic tips
Use one ringing string, mute the others, keep the room quiet, and move the guitar closer if the app says the signal is too quiet.
Privacy
The microphone stream is analyzed in this browser tab. The app has no backend and does not upload or store raw audio.
Accuracy notes
Phone and laptop microphones vary. Use calibration when matching another tuner, piano, or rehearsal room reference.