105 reviews
Content rating
Screenshot image
Screenshot image
Screenshot image

About this app

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.

You can reach us via
Twitter - @SECUSOResearch (https://twitter.com/secusoresearch)
Mastodon - @SECUSO_Research@bawü.social (https://xn--baw-joa.social/@SECUSO_Research/)
Job opening - https://secuso.aifb.kit.edu/english/Job_Offers_1557.php
Updated on
Oct 24, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

96 reviews
March 29, 2024
I don't know what everyone's so happy about with this app. It doesn't do anything. It just displays a little ruler picture on screen. Nothing else.
1 person found this review helpful
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Folco Nolte
July 20, 2020
Samsung S9... initial ruler was relatively precise... about 1mm difference on 10cm. Calibration made it terribly wrong. 1.1cm difference on 11cm. Since it's nothing else but a ruler I deinstalled it again.
33 people found this review helpful
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Jerry Warner
July 21, 2021
You can use the calibration with a ruler to get this pretty exact. In my case .756 was the magic number.
30 people found this review helpful
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