Basic Air Data Clinometer is an open-source and free-to-use app that allows users to measure inclination angles of their devices with respect to the direction of gravity. It uses the onboard accelerometers and features geometric-inspired graphics that can be used as a clinometer or bubble level. The app is intended for measuring purposes and not for storing data. Basic Air Data Clinometer is a lightweight app that is available on Android.

The app can be used as a bubble level for horizontal angles and as a clinometer for vertical angles. It also allows users to measure vertical angles using the camera and perform incremental measurements. The measurement values are displayed in five different ways, including X, Y, Z, Pitch, and Roll angles. Calibration is necessary before use, and the precision of measurements depends on the accuracy of calibration. Basic Air Data Clinometer is available in multiple languages, and anyone can contribute to the translation using Crowdin.

Overall, Basic Air Data Clinometer is a straightforward and reliable app that is perfect for measuring inclination angles. Its open-source nature, geometric graphics, and ease of use make it stand out from other similar apps on the market.