Key Transposer

A handy little app to help you transpose your song into a different key!

Matt Hauser · com.hauser.matt.keytransposer

Not rated yet 10K+ downloads v1.4 9 MB Android 6.0+ PEGI 3 · Everyone

Download APK 9 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v1.4 (4)
Updated: Aug 27, 2026 (1 month ago)
APK size: 9 MB
Requires: Android 6.0+ (API 23)
CPU support: Any (no native code)
Category: Music & Audio (app)
Listed since: May 2, 2023 (at least)
Permissions: 10 (1 sensitive)
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Key Transposer is an app by Matt Hauser in the Music & Audio category, listed since at least May 2023. It has no native code, so it runs on any Android processor.

Since version 1.1, the APK grew from 7.2 MB to 9 MB and the minimum Android version rose from 5.1 to 6.0. It asks for 10 permissions, 1 of them sensitive: read shared storage. Compared with version 1.3, it adds 3 new permissions: “Access adservices ad id”, “Access adservices attribution” and “Access adservices topics”. The app can read the advertising ID that ad and analytics services use.

What's new in v1.4

Bug fixes and improved performance.

Description

From the listing uploaded by “appupdater”.

Find the key of your song on the left side, and then drag the right side of the screen until the key of which you wish to transpose is next to the original key. Now, any key/note change in the original key will have the transposed key/note seen directly to the right of it. Clear as mud, right? (You can drag either side up or down)

Version history

3 versions are listed, going back to v1.1. Since v1.4 it requires Android 6.0+.

v1.4 LATEST Aug 27, 2026 9 MB TRUSTED v1.3 Aug 20, 2026 7.2 MB TRUSTED v1.1 Jun 10, 2024 7.2 MB TRUSTED

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Aug 27, 2026.
Certificate issued to “Matt Hauser” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Aug 27, 2026
Validated against Google Play Aug 27, 2026
Signed byCN=Matt Hauser, L=Davenport, ST=Iowa
Signing certificate (SHA-1)43:F6:68:06:C9:11:6D:03:7C:84:72:4B:50:C5:7E:7E:8E:67:C7:B6
File MD5d8ee4f5b55e51c31c617429ee4a79c5a
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (10)

Key Transposer requests 10 permissions, 1 of them sensitive.

Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
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
Internal broadcast protection (app-defined) com.hauser.matt.keytransposer.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
Run foreground services android.permission.FOREGROUND_SERVICE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch
Portrait screen android.hardware.screen.portrait

Key Transposer APK: questions and answers

Is there a version of Key Transposer for older Android phones?

The current version needs Android 6.0 or later. Version 1.3 is the newest listed build that installs on Android 5.1 and later. Get version 1.3 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Key Transposer APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is d8ee4f5b55e51c31c617429ee4a79c5a.