This is a trial version there is only one in-app-purchase to unlock everything.
The limited features are:
- 1 undo/redo
- 1 layer
- project management (save/load/import/export)

- Sculpting tools
Clay flatten smooth mask and many other brushes will let you shape your creation.
Need hard lines? you will also find some lasso/line/curve cutting tools.

- Stroke customization
Falloff alphas pencil pressure and other stroke parameters can be customized.

- Painting tools
Vertex painting with color roughness and metalness.
You can easily manage all your material presets as well.

- Layers
Record your sculpting and painting operations in separate layers for easier iteration during the creation process.
Both the sculpting and painting changes are recorded.

- Multiresolution sculpting
Go back and forth between multiple resolution of your mesh for a flexible workflow.

- Voxel remeshing
Remesh quickly your mesh to get a uniform level of detail.
It can be used to quickly sketch a rough shape at the beginning of the creation process.

- Dynamic topology
Refine locally your mesh under your brush to get an automatic level of detail.
You can even keep your layers as they will be automatically updated!

- Primitive shape
Cylinder torus triplanar voxel and other primitives can be used to quickly start new shape from scratch.

- PBR rendering
Beautiful PBR rendering by default you can upload your HDRI environment.
You can always switch to matcap for a more standard shading for sculpting purposes.

- Files
Save and open glTF OBJ and STL files.
Layers and PBR painting are only kept through GLTF files.

- Interface
Easy-to-use interface designed for mobile experience.
There is also a lot of customization possible!