Ruler (PFA)
Turns your device into a ruler.
App info
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App description
Android App Analysis and Review: Ruler (PFA), Developed by Karlsruher Institut für Technologie. Listed in Tools Category. Current Version Is 1.1.2, Updated On 20/04/2025 . According to users reviews on Google Play: Ruler (PFA). Achieved Over 27 thousand Installs. Ruler (PFA) Currently Has 113 Reviews, Average Rating 4.4 Stars
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
We are currently offering version 1.1.2. This is our latest, most optimized version. It is suitable for many different devices. Free download directly apk from the Google Play Store or other versions we're hosting. Moreover, you can download without registration and no login required.
We have more than 2000+ available devices for Samsung, Xiaomi, Huawei, Oppo, Vivo, Motorola, LG, Google, OnePlus, Sony, Tablet ... with so many options, it’s easy for you to choose games or software that fit your device.
It can come in handy if there are any country restrictions or any restrictions from the side of your device on the Google App Store.
What's New
Updates to Android 14.
Recent Comments
Folco Nolte
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.
MyName
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.
Jerry Warner
You can use the calibration with a ruler to get this pretty exact. In my case .756 was the magic number.
Absinthe Alice
Does what it' intended, quick and easy to use.
Sajid Khan
Simple and ADS FREE!!!
Steve White
Nearly the perfect app. Does one thing and does it well
AZEEZ ALIU (Nara)
Thank you for this ad free wonderful app.
Nucleus Rhyme
This app does what is says it does and nothing more. Excellent.