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OpenPencil vs Sketch: catalog facts
OpenPencil	Sketch
Free Free and open source under the MIT licence.	Paid Paid subscription software.
macOS, Web, Command line	macOS
Opens and round-trips Figma .fig files Headless CLI for exporting and analysing designs	Long track record as a dedicated UI design tool Established plugin ecosystem
Young project compared with established design tools Figma compatibility relies on a reverse-engineered file codec	Mac only, no Windows or Linux version Paid subscription required
Downloadable app, Web application	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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