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Design & ValidateToolOpen sourceFree
Pencil Project
An open desktop GUI prototyping tool with widget stencils, page links, shape collections, and multi-format document export.
Visit official siteContent record updated Aug 1, 2026Official site reached automatically · Checked Aug 3, 2026
Why it’s here
Teams can sketch menus, HUDs, and settings flows without an account before committing to visual design, keeping reviews focused on information hierarchy.
Best fit
Prototype systems, stories, and interactions, then validate them with real players.
ui-designprototyping
Before you commit
Its interaction model and component ecosystem are traditional, with limited complex motion or live collaboration; check community stencil licenses and version compatibility.
