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RawTherapee vs LightZone: catalog facts
RawTherapee	LightZone
Free Free and open source under GPLv3.	Free Free and open source under the BSD-3-Clause licence.
Windows, macOS, Linux	Windows, macOS, Linux
Non-destructive 32-bit floating point processing engine Two demosaicing algorithms can be applied to the same image	Processes camera RAW files Runs on Windows, macOS and Linux
The project itself says it benefits users who take the time to learn it No library or catalogue management; it develops files, it does not organise them	Smaller community than better-known RAW developers Documentation lives mainly in the repository
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: BSD-3-Clause
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked October 1, 2026

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