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