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Coulr vs Bella: catalog facts
Coulr	Bella
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0-or-later licence.
Linux	Linux
Screen color picker built in Quick conversion between RGB and hex	Picks a color from anywhere on the screen Saves picked colors in several color formats
Linux only Few features beyond conversion and picking	Linux only Small single-developer project with a narrow feature set
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
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.