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Curtail vs OptiImage: catalog facts
Curtail	OptiImage
Free Free and open source under the GPL-3.0-or-later.	Free Free and open source under the LGPL-2.1-only licence.
Linux	Linux
Handles PNG, JPEG, WebP and SVG Uses proven tools like oxipng and pngquant	Lossless and lossy compression modes Option to keep or remove metadata
Linux only Compression only, no other editing	Linux only Young project, first released in late 2024
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: LGPL-2.1-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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