All tools
Bass tuner
Tune a four- or five-string bass with your microphone, low notes included. Free, with no account or uploads.
Tune your bass
Press Start and play one string at a time; a pickup's sound can be clearer close to the speaker.
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Press Start and play a string
440 Hz is the usual pitch (ISO 16).
The microphone is asked for only when you press Start, and stopped when you press Stop or leave. The sound is read in your browser and never sent or kept.
A little help along the way
Follow these steps. Every option is explained underneath. The sound is read in your browser and never kept.
- Say what you are tuningA guitar, ukulele, bass, violin, or any note.
- Press StartAllow the microphone when the browser asks.
- Play one stringTighten when it says flat, loosen when it says sharp, until it says In tune.
Questions people ask
- Is the sound recorded or sent anywhere?
- No. The microphone is asked for only when you press Start, the sound is read in your browser as it comes, and nothing is recorded, sent or kept.
- Can it hear a low B?
- Yes. It reads notes from about 25 Hz up, so a five-string's low B (31 Hz) is heard, though a phone's microphone hears low notes faintly; play near it.
- Which tunings can it tune?
- Four-string E A D G and five-string B E A D G.
This page is the Tuner, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Tuner's own page.
Read the step-by-step guide