No fixed strings and no assumptions. Fork names whatever note it hears and shows how far it sits from that note, which is what you want for wind instruments, voice, or a stringed instrument in an alternate tuning.
The reference pitch is adjustable from 430 to 450 Hz, with 432 and 440 as one-tap presets. Changing it re-anchors everything at once, so every note and every reading moves together.
Common questions
Is it free?
Yes. No signup, no account, no paid tier.
Does it record me?
No. Pitch detection runs in your browser and the audio never leaves your device.
Can I tune to A = 432 Hz?
Yes. Reference pitch adjusts from 430 to 450 Hz under settings, with 432 and 440 as
presets.
Why does it need my microphone?
A tuner works by listening. Your browser will ask the first time you press start.