App for tuning musical instruments.
About this app
Tuner app for tuning musical instruments with features like: * Detect pitch based on autocorrelation and FFT spectrum. * Accuracy improvement by evaluating the spectrum phase information and polynomial fitting. * Show how pitch changes over time. * Basic instrument database (chromatic, guitar, bass, violin, …) * Support for custom instruments * Several temperaments like equal, just, Werckmeister, Kirnberger, … * Non-12-tone temperaments (EDO 17, 19, …, 41, 53) * Scientific settings like FFT window size, FFT window type, overlap and more.
Licensed under GPL-3.0-or-later, by Michael Moessner.
What's New in v9.1.1
Imported from the F-Droid repository index.
- v9.1.1:
- - Fix scrolling to correct note in strings view when in chromatic mode.
Version history
Apr 3, 2026 · 3 MB · Android API 23–36 · code 49
Imported from the F-Droid repository index.
- v9.1.1:
- - Fix scrolling to correct note in strings view when in chromatic mode.
SHA-256 12b8edb37a708ca7136deb66f6354704b232deb63fc1a191a122e2cfb77ab11a
Mar 24, 2026 · 3 MB · Android API 23–36 · code 48
Imported from the F-Droid repository index.
- v9.1.0:
- - Allow app-specific languages.
SHA-256 8e340fd86d2704b55af714bcd1239bd735fc5ba1e05d708b83fbfaff4d42a4f6
Nov 8, 2025 · 3.5 MB · Android API 23–36 · code 47
Imported from the F-Droid repository index.
- v9.0.0:
- - Initial support of stretch tuning (predefined tables required).
- - Option for Helmholtz numbered octave representation.
SHA-256 c4dcf83a7515608eddce4597958b9f614775c7464fa355d6a608715a827bf4e1
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be de.moekadu.tuner is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 9.1.0 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Tuner first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Tuner, and a listing is removed when the evidence for it stops holding up.
Get Tuner
Every source we list for de.moekadu.tuner is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
12b8edb37a708ca7136deb66f6354704b232deb63fc1a191a122e2cfb77ab11a
Signing certificate
d1ac7f2ff89e6dc1a1049d6eea22eda05a0d91dc4c973cd6b5d7c698d95a9b02
Permissions Required
What each permission lets Tuner do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
More Media Audio apps
More from F-Droid
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.