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Compositor vs Seashore: catalog facts
Compositor	Seashore
Free Completely free and open source.	Free Free and open source.
macOS	macOS
Photoshop-like workflow for compositing and retouching Free with no subscription	Native macOS interface Layers, brushes and effects for common editing tasks
macOS only Younger and less complete than Photoshop or GIMP	macOS only Fewer features than professional image editors
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 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.