This app uses diamond-square algorithm to generate random heightmap. You can change roughness and smooth cycles number to affect the final result.

Generated map can be shown as gray heightmap image or colored image. In case of colored image you can change color by adjusting water and mountain levels. Gray images as well as colored can be saved to your device.

Also it is possible to show generated terrain in 3D, rotate and zoom it.

There is no possibility to manually change heights and add water or any other objects.