Is Schulrechner safe?

This is a very early version in development. Unlabeled buttons will be implemented in the future, and bugs may be frequent. If you experience issues or have feature requests, please file an issue (link below). Frustrated by the lack of free, open-source scientific calculators that feel like the ones I am used to, I decided to reverse-engineer my old calculator from school. With features like: - i…

Developer: Joris Yidong Scholl
Category: Calculator
Earliest archived version: 09 Jun 2026
License: GPL-3.0-only (per F-Droid metadata)

02 / Release notes

Release notes from F-Droid

09 Jun 2026

1.15.0

Feature: Added % function Feature: Added ON-button Feature: Added OFF-button Feature: Added Setting to toggle Turn-Off = Close App Feature: Web Version can now be installed as a PWA Bugfix: (19/21) / (2/7) now results in a fraction Tweak: Made F-Droid App Fullscreen Tweak: Updated Dependencies…

Full notes →

03 / Package identity

Technical fingerprint

Application IDio.cardijey.schulrechner

Latest APK SHA-256bb05221904723b7c1fc5f0f8cd6645231fddfc42ba64c12815b0b418a1d62e22

Signing certificate68:AB:65:2B:4D:4F:AB:1A:68:90:CC:B4:49:B1:F7:9E:6C:6C:B0:A0:81:07:CB:43:6A:25:90:38:18:76:50:98

MIN ANDROID24TARGET36ARCHITECTURE

04 / Version archive

Documented releases

1 TOTAL

VersionReleasedAndroidArchitecture

1.15.009 Jun 202624+→

05 / Safety & access

Safety verdict

Authentic — file hash matches the source indexNo ads or tracking flagged by the source

IntegritySHA-256 verified vs source

SourceOpen-source · fdroid

Permissions1 declared · 0 sensitive

Signaturepresent

Anti-featuresNo known anti-features

Sensitive accessNo sensitive permissions

Declared permissions

io.cardijey.schulrechner.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Tracker status: Not assessed by WIKI for Android.

06 / Sources

Evidence ledger

Each entry is a captured public reference backing this record.

RepositorySource package page↗Source codeSource repository↗