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Sly vs A Photo Tool (Libre): catalog facts
Sly	A Photo Tool (Libre)
Free Free and open source with no ads or subscriptions; donations welcome.	Free Free to download and use under the GPLv3.
macOS, Linux, Android, iOS	Linux
Easy to use without editing experience Photos are processed locally and never uploaded	Straightforward exposure and color adjustments Custom black-and-white conversion
No Windows version yet Basic adjustments rather than a full editing suite	Limited file format support beyond JPEG No layers or advanced retouching
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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