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

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