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PaintTool SAI vs FireAlpaca: catalog facts
PaintTool SAI	FireAlpaca
Paid Paid license after a 31-day full-featured trial.	Free Free to download and use.
Windows	Windows, macOS
Smooth anti-aliased strokes suited to line art Full tablet pressure support	Free with no paid tier mentioned New brushes and templates added regularly
Windows only, and not supported in virtual machines No high-DPI monitor support	No Linux or mobile version Closed source
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.