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OpenPencil vs Lunacy: catalog facts
OpenPencil	Lunacy
Free Free and open source under the MIT licence.	Freemium Free to use, with paid options listed on the pricing page.
macOS, Web, Command line	Windows, macOS, Linux, Web
Opens and round-trips Figma .fig files Headless CLI for exporting and analysing designs	Native Linux version, unlike most UI design tools Opens Sketch files and converts from Figma
Young project compared with established design tools Figma compatibility relies on a reverse-engineered file codec	Some features sit behind paid plans Closed source
Downloadable app, Web application	Downloadable app, Web application
Open source	Closed source
License: MIT	License not stated
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 September 24, 2026

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