Aalener Optik-Formelrechner is an open-source (GPL-3.0-or-later) Android app by HS_Aalen_RN. The APK we host is 1.9 MB, it needs Android 5.0 or newer, and it declares no permissions at all.
The file on this page is Aalener Optik-Formelrechner 1.13, 1.88 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 de.HS_Aalen.don 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 no permissions at all.
Its licence is GPL-3.0-or-later. We took this build from F-Droid, and the source for this exact version is linked below.
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
- 1.13
- Size
- 1.88 MB
- Requires Android
- API 21
- Package
- de.HS_Aalen.don
- Signature checked on
- Sep 17, 2026
- Where this file came from
- F-Droid
- Licence
- GPL-3.0-or-later
- Source code
- Source for this version
File SHA-256: 4e26134bafc3e90c8cb05cf50745e2c0bd870d1f06407007cb3188ed30172483
Signing certificate (SHA-256): 3f4cb6a2ee088e6866b9c88dc7512ae6cff21bbbf07d5d02e1bf9cac2e3ff6b3
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
