The community around SAI is quite active. Users can find tutorials, plugins, and advice from other artists, which can be incredibly helpful.
One of SAI's standout features is its powerful and flexible brush engines. These allow for a wide range of artistic expressions, mimicking traditional drawing tools with surprising accuracy. paint tool sai for free
These are substitutes:
Would you like direct download links to any of these alternatives, or tips on setting up Krita to mimic SAI's interface exactly? The community around SAI is quite active
(More complex but powerful)