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Seashore vs Compositor: catalog facts
Seashore	Compositor
Free Free and open source.	Free Completely free and open source.
macOS	macOS
Native macOS interface Layers, brushes and effects for common editing tasks	Photoshop-like workflow for compositing and retouching Free with no subscription
macOS only Fewer features than professional image editors	macOS only Younger and less complete than Photoshop or GIMP
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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