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 type
Alerts
- Discontinued
Platforms
- Mac
- Windows
- Linux
- PortableApps.com




WireframeSketcher is described as 'Software tool that helps product managers, designers and developers quickly create wireframes, mockups and prototypes for desktop, web and mobile applications. It’s standalone software and a plug-in for any Eclipse IDE' and is a Wireframing tool in the development category. There are more than 25 alternatives to WireframeSketcher for a variety of platforms, including Windows, Web-based, Mac, Linux and iPhone apps. The best WireframeSketcher alternative is Pencil Project, which is both free and Open Source. Other great apps like WireframeSketcher are Napkins.dev, Frame0, Balsamiq Wireframes and Square Sketch.
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.

Versatile diagram software offering extensive templates for flowcharts, org charts, and more. AI integration simplifies diagramming, facilitates project analysis, and includes features like chatbots and OCR. Suitable for personal, professional, and collaborative use.




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




Axure RP is the leading tool for rapidly creating wireframes, prototypes and specifications for applications and web sites.




Principle makes it easy to create animated and interactive user interface designs. Whether you're designing the flow of a multi-screen app, or new interactions and animations, Principle lets you create designs that look and feel amazing.



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.




