442Hz Chromatic Tuner & Drone

cocosasm

In-app purchases

About this app

A precision chromatic tuner, true to its name. No ads, and it collects nothing.
First month free, then a small monthly subscription.

■ Tuner
· Listens through the microphone and shows the nearest note with a 0.1-cent readout
· Four precision levels — ±2 / ±5 / ±10 / ±15 cents, one-tap cycling
· A4 calibration — 415–466 Hz with one-tap 440/442 presets
· Swiss-poster design — giant type you can read from a music stand
· Fixed center needle, the dial glides smoothly (60fps)
· The page washes green and an IN TUNE stamp appears — readable from music-stand distance
· Filters out noise, speech and percussive attacks; favors sustained instrument tones (YIN algorithm)
· Solo/Ensemble mode — in rehearsal rooms, listens only to your instrument up close
· When two notes sound at once it shows nothing rather than a wrong note
· From low cello (43 Hz) to the flute's third octave (C7)
· Transposition (B♭·E♭·F) — clarinet, sax and horn players read written note names
· ♯/♭ notation toggle
· String presets (guitar·bass·ukulele·violin·cello) with per-string guidance and string lock

■ Drone
· The standard intonation practice tool for strings, winds and voice
· 12 notes × octaves 2–5, harmonically rich sustained tone with seamless looping
· Optional perfect fifth — practice scales over a harmonic reference
· Six note-name notations — C D E / 도레미 / Do Re Mi / Do Ré Mi / Dó Ré Mi / C D H

■ Subscription
· Free download + first month free (once per Google account)
· Then a small monthly fee, auto-renewed — cancel anytime in the Play Store
· No ads, no data collection — the subscription is the only revenue

■ Privacy
· Microphone audio is analyzed on the device only — never stored or transmitted
· No accounts, no ads, no analytics

Works for flute, violin, cello, guitar, clarinet, saxophone, voice and every other instrument.

What’s new

Precision Tuner & Drone — first release.

· 0.1-cent chromatic tuner — giant type, readable from a music stand
· A4 calibration 415–466 Hz, 4 precision levels
· Transposition (B♭·E♭·F), ♯/♭ toggle
· String presets — per-string guidance, string lock
· Drone — 12 notes × octaves 2–5, optional perfect fifth
· Solo/Ensemble mode — listens only to your instrument
· No ads · no data collection — microphone audio never leaves your device

First month free, then a monthly subscription unlocks it all.