1. Drawing Tools: These apps typically offer a variety of digital drawing tools, including pencils, pens, brushes, markers, and erasers.

2. Color Palette: Users can choose from a wide range of colors to apply to their drawings. Some apps allow users to create custom color palettes.

3. Layers: The ability to work with layers is important for creating complex drawings. Layers allow for better organization and editing of different elements in a drawing.

4. Zoom and Pan: Users can zoom in for fine details or pan across the canvas for larger-scale work.

5. Undo and Redo: These essential features let users correct mistakes or make changes easily.

6. Stylus Support: Many apps are compatible with styluses, providing a more natural drawing experience.

7. Export and Share: Finished drawings can be saved in various formats and shared on social media or with others.

8. Import Images: Users can import photos or images to use as references or incorporate into their drawings.

9. Brush Customization: Some apps allow users to customize and save their brush settings.

10. Text and Annotations: Adding text or annotations can be useful for adding labels or descriptions to drawings.

11. Vector Drawing: Some apps support vector graphics, allowing for scalable and high-quality artwork.

12. Tutorials and Guides: Beginner-friendly apps may include tutorials or guides to help users improve their drawing skills.

13. Community and Sharing: Users can often connect with other artists, share their work, and get feedback within the app's community.

14. Cross-Platform Compatibility: Drawing apps are often available on multiple platforms, enabling users to work on different devices and sync their work.

15. Offline Access: Some apps offer offline functionality, allowing users to draw without an internet connection.

The specific features and user interface may vary from one drawing app to another, and some apps may be designed for professional artists, while others are more user-friendly and suitable for beginners. When choosing a drawing app, consider your skill level, the type of work you want to create, and the features that are most important to you.