GuitarFretboardTrainer is an open-source (GPL-2.0-only) Android app by Simon Slater. The APK we host is 3.4 MB, it needs Android 5.0 or newer, and it declares no permissions at all.
The file on this page is GuitarFretboardTrainer 1.1, 3.40 MB, and it installs on Android 5.0 and newer.
We compared the signing certificate of this build with the certificate recorded the first time com.simonslater.guitarfretboardtrainer entered the site, and published both the file's SHA-256 and the certificate's fingerprint above so you can check the download yourself. That comparison says the file was not repackaged by someone else; it is not a review of what the app does.
The manifest inside the APK declares no permissions at all.
Its licence is GPL-2.0-only. We took this build from F-Droid, and the source for this exact version is linked below.
F-Droid, who build and sign this package, flag it: it contains advertising. We pass that on as they recorded it — we have not tested the app ourselves.
The most recent release upstream is from Oct 5, 2022, over 4 years ago. It still installs; it is simply not being updated.
We do not show a star rating or an install count for this page: we have no measured figure for either, and a number we cannot source is worth less than an empty field.
- Version
- 1.1
- Size
- 3.40 MB
- Requires Android
- API 21
- Package
- com.simonslater.guitarfretboardtrainer
- Signature checked on
- Sep 22, 2026
- Where this file came from
- F-Droid
- Licence
- GPL-2.0-only
- Source code
- Source for this version
File SHA-256: 0c0b05e29241305ba64d26895ce66e41d200dde5a4d060259f4369ca1716a00f
Signing certificate (SHA-256): d2609ae9b81ba68a1c4b731e8bdcff00e0713b63e8533b3cf30d5d21fd9d3a3e
We check that this file carries the same signing certificate as earlier releases of the same package. That shows the APK was not repackaged by someone else — it is not a security review of the app.
Screenshots
