Privacy Friendly Ruler turns the device screen into a ruler for quick measurements on the go. It can display rulers with either inch or centimeters as metric. Furthermore, it can display a protractor.
This app is optimized regarding the user's privacy. It doesn't use any tracking mechanisms, neither it displays any advertisement. It belongs to the Privacy Friendly Apps group developed by the SECUSO research group at Technische Universität Darmstadt, Germany.