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Privacy Friendly Apps to display a ruler on Android devices.
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Privacy Friendly Ruler

Get it on F-Droid

Privacy Friendly Ruler turns the phone screen into a ruler for quick measurments on the go.

This app is optimized regarding the user's privacy. It doesn't use any tracking mechanisms, neither it displays any advertisement.
Please be aware that Privacy Friendly Ruler is not a professionally calibrated measuring device. This App can be manually calibrated which may minimize the error. However, depending on the device there still can be rounding errors.


Privacy Friendly Ruler belongs to the group of Privacy Friendly Apps and has been developed to provide a privacy friendly measuring application.


Android Studio is required if further development is intended.

API Reference

Mininum SDK: 17 Target SDK: 25


Privacy Friendly Ruler is licensed under the GPLv3. Copyright (C) 2016 Roberts Kolosovs

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see

The icons used in the nagivation drawer are licensed under the [CC BY 2.5] ( In addition to them the app uses icons from Google Design Material Icons licensed under Apache License Version 2.0. All other images (the logo of Privacy Friendly Apps, the SECUSO logo, the app icon and the splash icon) copyright [Technische Universtität Darmstadt] ( (2016).


Markus Hau

naofum (Japanese translation)

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