Harmonica tuner for learning bending techniques with real-time visual feedback.
About this app
d Let's Bend: Blues Harmonica Tuner & Trainer assists harmonica players in accurately hitting bending notes through real-time visualization.
The application is completely free, ad-free, and can be used without registration. Sounds are captured via the MediaRecorder library as a continuous data stream, analyzed using advanced pitch detection algorithms, and displayed in real-time.
All common keys and special tunings of your blues harps are supported and can be easily configured via the settings menu.
Features: • Fast and accurate musical note detection • Multiple pitch detection algorithms (YIN, MPM, and HYBRID) • Support for all common harmonica keys and tunings • Adjustable concert pitch settings • Visualization of blow bends, draw bends, over blows, and over draws • Customizable confidence settings for pitch detection
Technical Details (for developers): • Open-source project available on GitHub • Built using Model-View-Controller (MVC) architecture • Developed with Gradle build system • Requires Android 9 (API 28) or higher • Uses Dagger for dependency injection • Implements SLF4J for logging • Optimized for privacy (no data collection or storage) • Part of a multi-platform project that includes desktop (macOS, Linux, Windows) and web versions
The app is also available for desktop platforms and as a web application at https://letsbend.de
Enjoy and Let's Bend!
Let's Bend is free and open source. If you find it useful, consider supporting development: https://ko-fi.com/egdels
Licensed under MIT, by egdels.
What's New in v3.7.0
Imported from the F-Droid repository index.
- What's new in 3.7.0
- • Smoother display: less flickering for notes, chords and pitch detection
- • Training: notes must now be held steadily to count – no more accidental hits
- • Training: next note advances immediately, even after silence
- • Training: fixed a crash during training sessions
- • Cleaner runtime output
Version history
Mar 19, 2026 · 5.2 MB · Android API 28–36 · code 30700
Imported from the F-Droid repository index.
- What's new in 3.7.0
- • Smoother display: less flickering for notes, chords and pitch detection
- • Training: notes must now be held steadily to count – no more accidental hits
- • Training: next note advances immediately, even after silence
- • Training: fixed a crash during training sessions
- • Cleaner runtime output
SHA-256 692b46f052c31839c53102966d222fbca3af51ce8ebf48ae2ec8fadc1b5a2481
Mar 16, 2026 · 5.2 MB · Android API 28–36 · code 30600
Imported from the F-Droid repository index.
- What's new in 3.6.0
- • Upgraded to Java 21 for improved performance and modern language features
- • Enhanced edge-to-edge support for Android 15+
- • Fixed OutOfMemoryError in audio pitch detection on Android
- • Fixed NullPointerException in note display during view transitions
- • Improved null-safety and stability fixes for note display
SHA-256 34ddb1a51931cd05a00d21d9ef83f093bb2ebe0789b73be6c73885723c3fde76
Sep 16, 2025 · 5.2 MB · Android API 28–35 · code 72
Imported from the F-Droid repository index.
- Improvements & fixes:
- - Edge-to-edge ready for Android 15+: enabled EdgeToEdge for proper inset handling on newer and older Android versions.
- - Updated Material Components to avoid deprecated status/navigation bar color APIs on Android 15.
- - Favorites enhancements:
- • Favorites bar sits at the bottom-right next to the toggle and stacks vertically.
- • Bottom-most favorite aligns with the toggle button for a cleaner layout.
SHA-256 a18c3f2893d2e202d7aa83227032c0b87a6d35df56c25a68c5401a831e8be575
Will it run on your device?
60%
- Targets newer Android builds, so legacy devices may be excluded.
- ABI coverage is focused on newer 64-bit devices.
- 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.schliweb.bluesharpbendingapp 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, 3.6.0 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Let's Bend: Harmonica 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 Let's Bend: Harmonica Tuner, and a listing is removed when the evidence for it stops holding up.
Get Let's Bend: Harmonica Tuner
Every source we list for de.schliweb.bluesharpbendingapp 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
692b46f052c31839c53102966d222fbca3af51ce8ebf48ae2ec8fadc1b5a2481
Signing certificate
ae322d3fb71afe21df4727e37a5c6803511d5a2fe1fc3135430cee0699fa1b34
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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.
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