The main features of SketchMotion app include providing tools and functionalities for drawing and animation creation. Here are some common features:

1. Drawing Tools: Hand-drawn animation apps typically offer various drawing tools such as brushes, pencils, colors, and erasers, allowing users to freely create their artwork.

2. Animation Creation: Users can combine the drawn graphics frame by frame to create animations. They can make subtle changes and adjustments on each frame to achieve a smooth animation effect.

3. Layer Management: To facilitate drawing and animation creation, hand-drawn animation apps often support layer management. Users can draw and edit content on different layers, enabling better control over the elements of their drawings and animations.

4. Timeline: Hand-drawn animation apps usually provide a timeline interface for managing and editing animation frames. Users can adjust the frame order, add or delete frames, and set transition effects between frames.

5. Export and Sharing: Once the animation is complete, hand-drawn animation apps allow users to export it in common animation formats such as GIFs or video files. Users can also share their animations with others using the in-app sharing feature or showcase them on social media.

These features empower users to create beautiful hand-drawn artwork and produce captivating hand-drawn animations. The specific functionalities and user interface may vary across different apps, allowing you to explore these features in your own app and unleash your creativity to make unique hand-drawn animations.