Music Theory Companion v9.0.1
APK · 14.1 MB · version code 121 · Android 7.0+ · uploaded Jul 25, 2026
- Signature matches the Google Play version Details
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Compared with the latest version
The latest version is v9.0.3, uploaded Oct 1, 2026 — about 2 months after this one.
- Size: this file is 14.1 MB; the latest is 14.2 MB (62.4 KB larger).
- Both versions request the same permissions.
File information
- Version
- v9.0.1 (121)
- Uploaded
- Jul 25, 2026
- Size
- 14.1 MB
- Requires
- Android 7.0+ (API 24)
- CPU support
- x86 64-bit, ARM 32-bit, ARM 64-bit
- Screen
- Small screens and larger
- MD5
- b260831f1c27cddd21bfaa11a2f93d39
- Signing certificate (SHA-1)
- D7:46:07:5D:1C:46:43:04:5A:30:BD:31:E8:E5:4D:B2:27:69:1B:5B
- Signed by
- CN=Prasenjit Ghosh, OU=self, O=self, L=Kolkata, ST=West Bengal, C=700091
- File name
- app-pg-scalechordprogression-121-75794314-b260831f1c27cddd21bfaa11a2f93d39.apk
- Package
- app.pg.scalechordprogression
- Downloads (all versions)
- 500K+
- Age rating
- PEGI 3 · Everyone
What's new in v9.0.1
✓ Increased the interval before showing the first full-screen ad
✓ Enhanced chord playback in piano Chord Pad
✓ Improved pitch detection
✓ Improved piano user interface
Permissions (16)
This version requests 16 permissions, 1 of them sensitive.
- Record audio (microphone) Sensitive android.permission.RECORD_AUDIO
- Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
- Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
- Access adservices topics android.permission.ACCESS_ADSERVICES_TOPICS
- Advertising ID com.google.android.gms.permission.AD_ID
- Full network access android.permission.INTERNET
- Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Internal broadcast protection (app-defined) app.pg.scalechordprogression.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
- Modify audio settings android.permission.MODIFY_AUDIO_SETTINGS
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Read basic phone state android.permission.READ_BASIC_PHONE_STATE
- Receive push notifications com.google.android.c2dm.permission.RECEIVE
- Run foreground services android.permission.FOREGROUND_SERVICE
- Show notifications android.permission.POST_NOTIFICATIONS
- View network connections android.permission.ACCESS_NETWORK_STATE
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Jul 25, 2026.
- Certificate issued to “self” This is the certificate of the Google Play version.
- Same certificate as the 5 other versions checked
Store checks
- Developer signature verified Jul 25, 2026
- Validated against Google Play Jul 25, 2026
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (5 other versions compared). AAPKs doesn't scan files itself.
How to install Music Theory Companion on Android 7.0+
You'll need about 28.3 MB of free space.
- Download the APK — tap Download APK above (14.1 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap app-pg-scalechordprogression-121-75794314-b260831f1c27cddd21bfaa11a2f93d39.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be b260831f1c27cddd21bfaa11a2f93d39. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open Music Theory Companion — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 7.0+). Download it again, or pick an older version.
- “App not compatible with your device” — this build contains native code for x86 64-bit, ARM 32-bit, ARM 64-bit only. Devices with other processors can't install it.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.