A free program for Android, by CTP-design.

With Build With Cubes, you can create 3D structures with voxel cubes. This tool is perfect for those who want to make their own mockup models. You can use a variety of cubes and blocks to build your own worlds.

The app has a simple and intuitive interface that will help you design your world. With it, you can create structures, add materials, and it even has a 3D block viewer. Each block has varied textures to give your creations more life.

You can build a castle, sky island, house, or even city. You can create pixel/voxel art 3D avatars. Do whatever you want!

And, to save your time and let you create symmetrical voxel models faster and more accurately, the app has a Symmetry Mode.