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Filmulator vs A Photo Tool (Libre): catalog facts
Filmulator	A Photo Tool (Libre)
Free Free and open source.	Free Free to download and use under the GPLv3.
Windows, Linux	Linux
Film development simulation for natural-looking tones Deliberately small set of controls	Straightforward exposure and color adjustments Custom black-and-white conversion
Much smaller feature set than larger raw developers Small project maintained by one main developer	Limited file format support beyond JPEG No layers or advanced retouching
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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