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FastRawViewer vs nomacs: catalog facts
FastRawViewer	nomacs
Paid Paid software from LibRaw, sold individually or in bundles with seasonal discounts.	Free Free and open source under the GPL 3.0.
Windows, macOS	Windows, macOS, Linux
Renders the actual RAW data rather than embedded JPEG previews RAW histogram, RAW statistics and highlight inspection for judging exposure	Opens RAW camera files and Photoshop PSD documents Synchronises pan and zoom between two windows or two machines
Paid software with no free tier A viewer and culling tool, not a full RAW editor	Not an editor; adjustments are minimal The interface exposes a lot of panels at once
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	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 September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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