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KPhotoAlbum vs Photo Supreme: catalog facts
KPhotoAlbum	Photo Supreme
Free Free KDE community software.	Paid Paid software with a 30-day free trial and no credit card required.
Linux	Windows, macOS, Linux
Fast tagging workflow for large batches of photos Searches combine people, places and custom categories	Handles very large catalogs Keeps your existing folders and metadata
Organizes photos rather than editing them Tagging a large archive still takes up-front effort	Paid after the 30-day trial Focused on cataloging rather than editing
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 24, 2026

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