OneOctave – Play-Along Piano
Play any MIDI with a few keys
Free · Designed for iPad. Not verified for macOS.
You cover a few keys — OneOctave plays the rest. Import any MIDI or make your own, then play along at your own pace. Fully offline.
OneOctave turns any MIDI into a play-along. You cover a small range of the keyboard — as few as 3 keys — and the app performs every note outside your window. So even hard pieces are within reach from your very first day.
Falling notes show you exactly what to play. Anything you don't cover, OneOctave plays for you — so the music always sounds complete.
WHAT YOU CAN DO
• Start on just 3 keys, then grow to 5 keys, 1 octave, or 2 octaves
• Three ways to play — Listen (watch it perform), Play (perform in time), Learn (the song waits for each note)
• Import any MIDI (.mid) file and play along — it's saved to your library so it's never lost
• Build your own song in the MIDI editor: tap notes onto the timeline, preview, and save
• Slow the tempo, transpose to your range, or show the melody only while you learn
• Bundled beginner tunes and warm-ups so you can start right away
PRIVATE BY DESIGN
OneOctave works fully offline. There's no account and no internet connection — nothing you play or create ever leaves your device.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New in 1.1 — more sounds, and a keyboard to match!
Alongside the two pianos, you can now perform any song with three new instrument voices: Organ, Strings, and Harp. Pick one in Settings → Sound.
The play-along keyboard now takes on each instrument's look — warm wood for Organ, deep mahogany for Strings, polished gold for Harp. Prefer plain piano keys? Turn on "Default piano keys" in Settings.
Thanks for playing OneOctave — we'd love to hear what you think!
The developer, Jun Park, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jun Park
- Size
- 85.9 MB
- Category
- Music
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 5 more
- English, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Bon Standard