Crystal Ball is a free, open-source Android Multimedia app. The latest version is 0.4, it is 13.1 MB, requires Android 8.0+, and is published by Kreuder.
- Size
- 13.1 MB
- Requires
- Android 8.0+
- Last updated
- 29 days ago25 Aug 2026
- Safety
- Scanned25 Aug 2026what does this mean?
License: GPL-3.0-only · Target SDK: 36 — what does target SDK mean?
About this app
Crystal Ball listens to your guitar and tells you what chord you just played. Press Detect single chord, strum, and it names the chord and draws how to fret it — with the chords it nearly picked instead one tap away, and other ways to play the same one further up the neck. Capture a whole part and it becomes a song sheet you can keep, correct and share. Early-stage release — expect rough edges.
Screenshots
Permissions2 requested · 1 worth reviewing
What version 0.4 is allowed to do once installed. Highlighted entries reach outside the app’s own sandbox and are worth a second look. Not sure what a permission actually means? Learn how to evaluate app permissions.
Record AudioReview
Record audio using the microphone.
android.permission.RECORD_AUDIO
Dynamic Receiver Not Exported Permission
No description available for this permission.
de.singular.crystalball.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Version history1 published build
- v0.4Latestbuild 4Scanned
- Released
- 25 Aug 2026
- Size
- 13.1 MB
- Requires
- Android 8.0+
- Target SDK
- 36
German, and a couple of things that were only ever in English. • German throughout, with a language picker in Settings → System. • German note names (H/B) as a switch of its own: being taught H is not the same as reading German. • Recent songs in the side panel — the last five you opened or read from. • Settings split into Chords, System and About tabs, with the version and licence on About. • Relicensed to GPL-3.0-only; wordmark and icon are CC BY 4.0.
Download v0.42 permissions · 1 worth reviewing
Record AudioReview
Record audio using the microphone.
android.permission.RECORD_AUDIO
Dynamic Receiver Not Exported Permission
No description available for this permission.
de.singular.crystalball.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
New to sideloading? Read the install guide before opening an APK. Not sure this build supports your phone? See how to check your device’s Android version.
Read our guide to the best open-source Multimedia apps for Android
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