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Gifski vs ImageFlow: catalog facts
Gifski	ImageFlow
Free Free and open source; a separate commercial license is available for closed-source use.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux, Command line	Linux
Thousands of colors per frame with temporal dithering Resize and compression controls for size limits	Outputs both GIF and WebP Exposes palette, dithering and frame rate settings
Output is limited by the GIF format itself GUI apps for Windows and macOS are maintained separately	Small project with a single maintainer Linux only
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0-or-later
No account needed	Not stated if an account is 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.