Ten tools
One tap from the home screen. Each opens full screen, ready the moment it appears.
Fully offline
OCTAVE works offline. Every sound is synthesised on the device.
No data collected
No account, no analytics, no ads.
Nine languages
In English, Simplified and Traditional Chinese, Japanese, Korean, German, French, Spanish and Brazilian Portuguese. It follows your system language on first launch; switch any time in Settings.
Ten focused tools
- 01TUNEChromatic tuner
A strobe ring that spins with your error and closes into one solid ring when you are in tune. Chromatic, Guitar, Ukulele and Violin modes.
- 02HOLDSustain a steady note
A live pitch trace around a ±10 cent band, and a score from 0 to 100 with offset, wobble, drift and vibrato.
- 03SCALEScales & modes
14 scales and modes on a pitch circle and a two-octave keyboard.
- 04CHORDChords & progressions
15 chord qualities and 9 progressions in any key, with smooth voice leading shown on the keyboard as it plays.
- 05BEATMetronome
20 to 300 BPM with a swinging pendulum and tempo names; keeps playing in the background.
- 06TAPTap tempo
Tap anywhere, or clap into the microphone, then send the tempo straight to BEAT.
- 07RANGEFind your vocal range
Sing low and high; OCTAVE marks your lowest and highest notes, span and voice type.
- 08SCOPELive sound visualiser
Six views: Bloom, Spectrum, Wave, Sparks, Chroma and Level, with the detected note and key.
- 09EAREar training
Intervals, chords and scale degrees, answered with one tap; new answers open up as you improve.
- 10DRONEDrones & pedal tones
Tanpura, organ, strings or sine in any key, with a mixer for each string; keeps playing in the background.
The real app
Your sound stays on your iPhone
OCTAVE works offline. Audio from the microphone is analysed on your iPhone and is never recorded or sent anywhere. No account, no analytics, no ads.
Privacy policyUsing the OCTAVE card?
The guide for the AI Passport card edition is still here (in Chinese).
Card edition guide