Bubble level is a free Android application developed by Testskill that helps you check whether a surface is horizontal or vertical. This utility tool is a must-have for anyone who frequently needs to check the levelness of surfaces, such as builders, carpenters, or DIY enthusiasts.

The app has a simple interface, making it easy to use for anyone. It uses the device's built-in accelerometer to determine the levelness of the surface. The app is accurate, and the bubble level is easy to read, making it a reliable tool to use.

Overall, Bubble level is a useful and practical tool for anyone who needs to check the levelness of surfaces. It's easy to use and provides accurate results, making it a must-have application for those who work with surfaces regularly.