Quick answer
(SECUSO) On the fly measurements with your Smartphone as ruler or protractor.
F-Droid repository metadata
Privacy Friendly Ruler can display a ruler or protractor at the edge of the display. This enables on the fly measurements with the smartphone. It belongs to the Privacy Friendly Apps group developed by the research group SECUSO at Karlsruhe Institute of Technology. More information can be found an secuso.org/pfa/
What makes Privacy Friendly Ruler different from other similar apps?
1. No permissions Privacy Friendly Ruler does not require any permissions.
2. No advertisement Many other free apps in the Google Play Store dazzle annoying advertising and also shortens battery life.
Feel free to contact us via: Bluesky - @secusoresearch.bsky.social https://bsky.app/profile/secusoresearch.bsky.social Mastodon - @SECUSO_Research@bawü.social https://xn--baw-joa.social/@SECUSO_Research/ Job opening - https://secuso.aifb.kit.edu/english/Job_Offers.php
Screenshots
How to install
- Download the APK from the button at the top of this page.
- Allow “Install unknown apps” for your browser or file manager only, not for every app.
- Open the downloaded file and confirm the installation.
- 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 Ruler (Privacy Friendly)?
(SECUSO) On the fly measurements with your Smartphone as ruler or protractor.
Who develops Ruler (Privacy Friendly)?
Ruler (Privacy Friendly) is developed by SECUSO - Security Usability Society.
Which Android version does Ruler (Privacy Friendly) require?
Ruler (Privacy Friendly) requires Android API 17 or later.
What is the current version of Ruler (Privacy Friendly)?
The synchronized F-Droid version is 1.1.4.
Which license does Ruler (Privacy Friendly) use?
The signed F-Droid metadata lists GPL-3.0-only.
Where is the source code for Ruler (Privacy Friendly)?
https://github.com/SecUSo/privacy-friendly-ruler
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