Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
Cost / License
- Free
- Open Source (GPL-2.0)
Application types
Alerts
- Discontinued
Platforms
- Mac
- Windows
- Linux
- PortableApps.com




Indigo Studio is described as 'The newest design tool from the leaders in UX, Indigo Studio lets you quickly and simply explore and create functional, animated UI prototypes while maintaining the focus on user experience at every step' and is a Wireframing tool in the development category. There are more than 10 alternatives to Indigo Studio for a variety of platforms, including Web-based, Windows, Mac, SaaS and Linux apps. The best Indigo Studio alternative is Pencil Project, which is both free and Open Source. Other great apps like Indigo Studio are Napkins.dev, Frame0, Balsamiq Wireframes and Wireflow.
Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.




An open source wireframe to app tool powered by Llama 3.2 vision. Upload a screenshot of a simple site/design & get code.


Sketch your app ideas without stress Make hand-drawn style wireframes quickly and easily.




Low-fidelity UI wireframing tool simulating sketching experience, optimized for speed with Quick Add, built for collaboration, drag-n-drop simplicity, exportable wireframes to PNG/PDF, interactive prototypes via linking, hundreds of UI components, reusable symbols, and more.




Feature-rich, open-source Wireflow offers a collaborative platform for online creation of complex user flow prototypes. Ideal for team work in UI design, wireframing, and mind mapping, promoting idea sharing in real-time environment aided by modern whiteboard features.

A streamlined web app that helps you create and collaborate in real-time on wireframes, mockups, diagrams and prototypes.




We believe the screen is the most important place in the world. That’s why we are dedicated to helping you deliver the best possible digital product experience, with our platform and best practices from your peers.




A collaborative design tool offering wireframing, prototyping, and design specs creation in a single browser-based platform. Integrate seamlessly with your workflow via API, sync with Sketch and Photoshop, and utilize a vast library of assets. Streamline design-to-dev with automated code generation.





Revolutionize your development process by bridging the gap between designers and developers to turn your design visions into production-ready UIs.




Studio.Design is the site builder for designers. The browser app is packed with design features as intuitive as Figma, a CMS as simple as Notion, and one-click publishing to your domain. Now, you can finally turn any idea into a stunning website quickly and easily.



Origami Studio is a free design tool built by Facebook designers for creating interactive UI prototypes. An elegant, layer-based interface allows designers to repaidly create prototypes with layers, build interactions and then share them with others.



