SlimBook

Mark Retallack

Tools

SlimBook is an open-source (MIT) Android app by Mark Retallack. The APK we host is 2.7 MB, it needs Android 8.0 or newer, and it declares 8 permissions.

The file on this page is SlimBook 1.0, 2.70 MB, and it installs on Android 8.0 and newer.

We compared the signing certificate of this build with the certificate recorded the first time uk.org.retallack.slimbook 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 declares 8 permissions, none of which cover contacts, location, SMS, the camera or the microphone.

Its licence is MIT. 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 relies on a network service that is not open source. We pass that on as they recorded it — we have not tested the app ourselves.

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.

Download APK · 2.70 MB

Version: 1.0
Size: 2.70 MB
Requires Android: API 26
Package: uk.org.retallack.slimbook
Signature checked on: Sep 18, 2026
Where this file came from: F-Droid
Licence: MIT
Source code: Source for this version

File SHA-256: 73c06104db3edd4647ca588f7a773c62c5865dd2b333e57d9a14ec507b8fae78

Signing certificate (SHA-256): 8cba8d1bda586d65144934537693f45397aca0453445ef5edec88388bd4d0855

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.