KeyJaan! is made and published by Mamiko Tsukamoto. AppBrain is an independent app data site and isn't affiliated with Mamiko Tsukamoto. The app name, icon, screenshots and description belong to Mamiko Tsukamoto and are shown as published on the App Store.
AppBrain's verdict
- Last updated
- July 20, 2026
Rankings
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Releases
Updates seen on the App Store- Version
- 1.0
- Launched
- July 2026
No changelog data
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Technology
Found in the app by AppBrain- Price
- Free
- App size
- 89.5 MB
- Content rating
- Everyone
Technologies used by KeyJaan!
About the app and developer
About KeyJaan!
KeyJaan! is a music app developed by Mamiko Tsukamoto.
What is the rating of KeyJaan!?
KeyJaan! has no ratings yet.
Is KeyJaan! free?
KeyJaan! is free. The app size is 89.52 MB. The latest version available is 1.0. The last update was on July 20, 2026.
What are the requirements for KeyJaan!?
The app has a content rating of Everyone. The app has been available on the App Store since July 2026.
Developer information for Mamiko Tsukamoto
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Frequently asked questions about KeyJaan!
Is KeyJaan! free?
Yes. KeyJaan! is free on the App Store.
Is KeyJaan! still available?
Yes. KeyJaan! is on the App Store, and the last update we saw was on July 20, 2026.
How large is KeyJaan!?
KeyJaan! is 89.52 MB.
Is KeyJaan! suitable for children?
App Store rates the content of KeyJaan! as suitable for everyone.
Who made KeyJaan!?
KeyJaan! was developed by Mamiko Tsukamoto. It is listed in the music category on the App Store.
What are the best alternatives to KeyJaan!?
People looking at KeyJaan! also look at these music apps: DrumTrainer, RHYTHM DELAY, MoDoSolfa, My Little Drum, PoRaBar - Podcasts & Radio.
Store listing
By Mamiko Tsukamoto, from the App Store
Description by Mamiko Tsukamoto Written by the developer, not by AppBrain. Click to read.
KeyJaan! is a chord-progression rhythm game that analyzes songs from your own music library — right on your device. Pick a song, and its tempo, beats, bars and chord progression become a playable chart in seconds. No sheet music, no chart downloads.
■ Three ways to play
Plug in a MIDI keyboard and your real playing becomes the score
Use the microphone to play with a piano or your voice (experimental)
No instrument? Tap the beat and swipe the chords
■ Music theory scores points 7th chords, slash chords, modulations, voice leading — the more musical your playing, the higher the score. Harder songs multiply your points. Left hand rides the beat, right hand sings the melody.
■ The crowd goes wild Ten audience characters react to your playing in real time. Nail a 7th and they'll actually hear it.
■ Records that stack up Achievements, daily streaks, per-song best scores and rankings. Chase that S rank — it's reserved for near-perfect play.
■ 6 demo songs included Original demo tracks are bundled and pre-analyzed, so you can play the moment you download.
■ Private by design Analysis and scoring happen entirely on your device. Your songs never leave it. No data collection, no ads.
FREE: 6 demo songs + analyze up to 5 of your own songs, with a 7-day full-feature trial (1-minute mode stays available afterwards). KEYJAAN PRO (one-time purchase): unlimited analysis + all play lengths. No subscription.
Works with: MIDI keyboards (USB/Bluetooth) / your music library / audio files (mp3, m4a, wav and more) Note: DRM-protected streaming tracks (e.g. Apple Music subscription songs) cannot be analyzed.