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mtPaint vs GraphicsGale: catalog facts
mtPaint	GraphicsGale
Free Free and open source under the GPL-3.0.	Free Freeware since June 2017.
Windows, Linux	Windows
Edits indexed palette and 24-bit RGB images Layers, channels and animation support	Real-time animation preview while editing Onion skinning and layers for frame-by-frame work
Basic tools compared with full photo editors No release binaries published on the GitHub repository	Windows only Closed source
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License: Freeware
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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