Free · in your phone's browser · nothing uploaded
Cello tuner
A free cello tuner in your phone's browser: C G D A one string at a time, with a needle and the cents; A at 440 or 442 Hz. Nothing uploaded.
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The microphone stays open while you tune and closes when you stop, when everything is in tune, or after half a minute of quiet. Nothing is recorded or sent.
How to tune
A cello is tuned C G D A, an octave below a viola. Start with the A, then D, G and C. Bow a long, even note; put the phone on the music stand, not on the floor next to the endpin, where the room's hum is loudest.
The low C sits at 65 Hz, near the bottom of what a phone's microphone hears well. If the needle wanders, bow a little nearer the bridge so the note speaks clearly.
The needle shows how far you are from the note the tuner expects, in cents: a hundred cents is a semitone, five or closer gets the tick, and anything inside twenty most people don't hear.
Then play something
The notes you tuned go into Brumm as a short melody, inside a club track with a beat and a bass. No account, no upload: the notes travel inside the link itself. Hum or play a line there, and it becomes an instrument.
The microphone is read in the browser and nothing is kept. How the site counts visits.