Pencil Project has been discontinued. Similar apps include Penpot, which is open source with a free version. Other options are Figma, LibreOffice - Draw, Open Pencil and Penpot Desktop. There's no shortage of Prototyping Tools like Pencil Project, with more than 50 alternatives for Windows, Mac, the web, Linux and iPhone.
GUI Design Studio allows developers, analysts, designers, interaction specialists and business professionals to quickly create interactive prototypes without writing a single line of code.
Online tool for creating mockups in the browser. Use your browser’s save function to save the file (just html for view only, complete save for an editable version) or export to codepen for others to view.
Serena Prototype Composer - the best agile application prototyping tool is now free! View the demo, take the product tour, or download it free today.
PowerMockup is a PowerPoint add-in for sketching screens of web and desktop applications. The interface elements make it a breeze to prototype and evaluate different design ideas before proceeding to the implementation.
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AI-powered prototyping tool enabling product teams to quickly generate UI aligned to existing styles, import design systems, collaborate live, gather user feedback, test new features, support data-driven decisions, and ensure enterprise-level security and compliance.
United States
FlairBuilder is a user interface prototyping tool for easy authoring of interactive website wireframes, mockups and GUI prototypes.
Helix is a free AI-powered prototyping tool that turns ideas into interactive prototypes in just 3 minutes—no coding or design skills needed.
EaSynth ForeUI is an easy-to-use UI prototyping tool. You can use ForeUI to create skinnable prototype of software or website, and run the interactive simulation in your web browser. You can switch the UI theme of the prototype, thus the fidelity will be changed as well.
United States
Kwippe has a curated database of over 33,000 open source and creative commons vector icons, emojis, and other graphics that can be customized in our easy to use editor and variations generator.
Generate diagram-rich reports and documents, instantly. Generate software architecture diagrams, network diagrams, UML diagrams, cloud diagrams and many more!
