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FlowVision vs nomacs: catalog facts
FlowVision	nomacs
Free Free and open source.	Free Free and open source under the GPL 3.0.
macOS	Windows, macOS, Linux
Waterfall layout that preserves image proportions Browses both images and videos	Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines
macOS only A browser and viewer, not an editor	Not an editor; adjustments are minimal The interface exposes a lot of panels at once
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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