Angle Gradient Inclinometer is a simple and free iPhone application that allows users to measure tilt by tilting their device. With this app, you can easily determine the angle of inclination from 0 degrees to 359 degrees. The measurements can be displayed in both gradient (%) and as the angle at which the sum is 180 degrees or 360 degrees. Additionally, you have the option to switch to the theodolite mode, where you can set a specific angle as 0 degrees. For example, if you set 45 degrees as your reference angle, the app will display it as a gradient of 100%. This utility tool is perfect for any situation where you need to measure tilt accurately and conveniently.