AR Ruler - Tape Measure is a free Android app developed by Shyam Barange in the Utilities & Tools category. It allows users to measure lengths in the real world using their smartphone's camera and augmented reality technology (AR). The app works by pointing the camera towards a horizontal or vertical surface and measuring the linear distance in centimeters.

The app is easy to use and provides fairly accurate measurements in most everyday situations. It uses a special sensor available in the phone to accurately tell the distance between two coordinates in the real world. However, it should be noted that the measurements obtained with the app are approximate, but within 1cm of range.

The app also has a feature to measure area and volume, which is currently under development and will be updated soon. Please note that AR Ruler requires an ARCore technology provided by Google. ARCore is constantly improving, which, in turn, positively affects the quality of the app. Overall, AR Ruler - Tape Measure is a useful tool for anyone who needs to measure length in the real world using their smartphone's camera.