# KeyJaan! — Your songs become the game

> Your songs become the game (iPhone/iPad app by Mamiko Tsukamoto.)

- Source: https://appshunter.io/ios/app/keyjaan/id6789836028 (this page in markdown: same URL + `.md`)
- Developer: [Mamiko Tsukamoto](https://appshunter.io/developer/1837855636)
- Category: Music, Games, Music
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 90 MB
- Languages: American English, Japanese
- Released: 2026-07-20
- Data updated: 2026-08-01
- User reviews in markdown: https://appshunter.io/ios/app/keyjaan/id6789836028/reviews.md

## What is KeyJaan!?

Your songs become the game.

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| KeyJaan Pro | $9.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-07-20

No release notes.

## More apps by Mamiko Tsukamoto

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- [PitaBlock 5x5](https://appshunter.io/ios/app/pitablock-5x5/id6752341821)
- [Image Viewer for Discord Bots](https://appshunter.io/ios/app/image-viewer-for-discord-bots/id6752387071)
- [StampMAX Sticker & Emoji Maker](https://appshunter.io/ios/app/stampmax-sticker-and-emoji-maker/id6752710300)
- [Card Memory for study](https://appshunter.io/ios/app/card-memory-for-study/id6752864823)
- [Thermal- like AR Camera](https://appshunter.io/ios/app/thermal-like-ar-camera/id6753177744)

All apps by Mamiko Tsukamoto: https://appshunter.io/developer/1837855636

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-01.*