Circle of Mohr is an interactive 2D and 3D circle that is particularly useful for civil and mechanical engineers. This free application, developed by LetsConstruct, can be downloaded on Android devices. The app allows users to input stresses and view principle stresses in any direction by touching or inputting the angle. Additionally, users can export images for easy sharing or reference.

The Circle of Mohr app is a valuable tool for engineers who need to visualize and analyze stress data. The app is user-friendly and easy to navigate, making it accessible for both students and professionals. With its 2D and 3D capabilities, the app offers a comprehensive view of stress data that is unmatched by other similar apps. Overall, Circle of Mohr is an excellent addition to any engineer's toolkit.