Pencil Project
Sketch interface wireframes and diagrams locally before committing to a collaborative design subscription.
What’s included for free?
Free open-source desktop GUI prototyping and diagramming application. Repository documents older platform targets and an Electron rewrite; verify release compatibility on your OS before relying on it for client delivery.
Where it runs: Local install
Provider information ↗Checked 2026-10-14
Before you use it
GPL-2.0 software; distributed modifications must comply with copyleft and source obligations. Imported artwork and documents retain their own rights.
Provider terms can change. Check current pricing and usage rights before starting a project.