QED icon

QED

Jonah Bauer
Internet
Version
3.1.4+fdroid
Size
5.9 MB
Requires
Android API 24+
4.2 / 5 · 2,654 ratings 3 downloads

Updated Sep 22, 2026

Quick answer

Unofficial frontend for the web services of the QED e.V.

F-Droid repository metadata

This app bundles the chat, gallery and database of the Quod Erat Demonstrandum e.V. into one very, very good app. Disclaimer: This app is not related to the Quod Erat Demonstrandum e.V. in any official way.

Screenshots

QED screenshot 1
QED screenshot 2
QED screenshot 3
QED screenshot 4

What’s new

How to install

  1. Download the APK from the button at the top of this page.
  2. Allow “Install unknown apps” for your browser or file manager only, not for every app.
  3. Open the downloaded file and confirm the installation.
  4. If installation fails with “App not installed,” remove an earlier build of the same app first. A signature conflict is the usual cause.

Data safety

  • Every file is checked against its published SHA-256 before it is listed.
  • Files are scanned for malware on every update.
  • The permissions each app requests are listed on its own page.
  • Read the full safety policy for how we test, flag, and delist files.

Frequently asked questions

What is QED?
Unofficial frontend for the web services of the QED e.V.
Who develops QED?
QED is developed by Jonah Bauer.
Which Android version does QED require?
QED requires Android API 24 or later.
What is the current version of QED?
The synchronized F-Droid version is 3.1.4+fdroid.
Which license does QED use?
The signed F-Droid metadata lists MIT.
Where is the source code for QED?
https://github.com/jbb01/QED

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