Pros:-
- Can use with IPAD
- 136 incredible brushes
- Fastest 64-bit painting engines on IOS
- Can connect keyboard to use shortcuts for advanced features
Cons:-
- No free version found on App Store
- Some users complained crashes randomly under the app review
Overall, it may not be free but it is able to produce professional illustration so it is a very useful product.
Thanks for sharing. An upvote as encouragement for your effort made!