iPhone Screenshots


Instantly identify musical pitch by note and octave with unlimited polyphony.

A lively display shows you the musical notes corresponding to distinct pitches in the sound picked up by your iPhone's built-in microphone, arranged horizontally on the chromatic scale, and vertically by octave.

This musicians' companion performs true equal temperament tone analysis across 9 full octaves, from C1 to B9, at 1/8 semitone resolution. It is precise enough to tune many instruments, and responsive enough to see tremolos.

Practice singing, bowing or sliding with instant visual feedback that you're on-key and in-tune. See fundamentals and overtones in the context of the chromatic scale (useful for vocalists). The configurable display is designed to be bright and easy to see from a distance in all conditions, indoors and outdoors.

This tool is not intended for engineers: you won't see Hz, dB, or line graphs anywhere - just notes and octaves.

This is not just a tool: anyone who enjoys music and color can enjoy Octaves Flat as a music visualizer: tap the screen anywhere and the guides disappear for a reactive full-screen color show when music can be heard.

Display options are just a left-swipe away.

Record videos with iOS' built-in Screen Recording, accessible through Control Center once added in Settings -> Control Center -> Customize Controls -> Screen Recording. Once added in Control Center, be sure to enable Microphone Audio recording by long/hard pressing the Record button and touching the microphone button.

Limitation: copy protection prevents apps from directly accessing the raw audio data of music in a user's music library. Consequently, Octaves Flat is limited to listening through the microphone, and will not work as expected when playing music through headphones.

Limitation: it is unknown whether Octaves Flat will work with particular third-party microphone peripherals. It might, or it might not, or it might work but incorrectly. I've tested a 1/8" mono mic and a lightning mono mic and both worked, but data parameters may vary with other digital mics. Let me know through the support link if you need to use an external mic and it doesn't work.

Ratings and Reviews

3.0 out of 5
2 Ratings

2 Ratings

Bugs in App too ,

Incredible Tech!

I’ve been using the Octaves Flat app for over six months primarily as a tool to improve my singing tonal accuracy. This app is very effective at real-time feedback. I primarily purchased the app to help me learn vocal overtone singing and this app rocks at that because it shows all of the various notes that I hit with overtones and it’s easy to visualize the harmonic octaves.

What I would recommend to the developer is this: allow the user to “record” a piece or track and then allow that recording to be played back with the original notes grayed-out and overlapped with the current notes being sounded. This increased functionality will benefit the user by turning the app into a virtual vocal coach, having greater appeal to a larger market segment.

tree12312 ,

Doesn’t work

Unintuitive and does not work for me at all. No instructions. Playing a single note and it picks up several tones? Not useful.


Atlee Brink
15.6 MB

Requires iOS 11.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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