Open-source GUI prototyping tool for creating wireframes and mockups across desktop platforms.
What is Pencil Project?
Open-source GUI prototyping tool for creating wireframes and mockups across desktop platforms. See it in our Design Tools collection.
Key benefits
- Pencil Project helps you design or prototype interfaces faster than starting from scratch.
- Pencil Project supports modern product design workflows, from early exploration through handoff.
- Teams can use Pencil Project alongside tools like Figma, Webflow, or Framer for a more complete design stack.
Use cases
- Using Pencil Project during early sketching and wireframing for a new product or feature.
- Relying on Pencil Project to maintain design systems, component libraries, or tokens.
- Pairing Pencil Project with your dev stack so handoff to engineering is smoother.
About Pencil Project
Pencil Project is a free, open-source GUI prototyping app aimed at fast wireframing and mockups. It runs across major desktop platforms and includes built‑in shape collections and UI stencils, making it easy to sketch interfaces without starting from scratch. The tool is well-suited for early-stage product exploration, internal reviews, and communicating layouts to stakeholders. Pencil’s focus is practical: quick diagrams, screens, and flowcharts you can export and share. It’s a good fit for teams that want a lightweight, no‑friction prototyping option without SaaS lock‑in or recurring costs.
Sources & further reading
- wireframing
- prototyping
- ui-design
- open-source
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