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

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