Tuner

Tunes guitar, ukulele, bass and violin through the microphone. Pitch is computed in your browser — no audio leaves your device.

Allow the microphone, play a note, and the needle shows the deviation in cents.

Anotona does this for you

Photograph a page of sheet music or play the melody — Anotona finds the key, engraves the notes and transposes them into any other. Free.

Every note on this page is computed, not typed in — following the rule that also makes F# major spell its seventh degree E#, not F.