Open Source Mockup Builder Alternatives

    Mockup Builder is described as 'Design your software or website mockups within minutes. Mockup Builder is a new look to solve old problem with prototyping and sharing sketches with customers'. There are more than 25 alternatives to Mockup Builder for various platforms. The best alternative is Pencil Project, which is both free and Open Source. Other great sites and apps similar to Mockup Builder are Diagramo (Free, Open Source), Wireflow (Free, Open Source), quickMockup (Free, Open Source) and Mockup Designer (Free, Open Source).

    The list of alternatives was last updated Jul 9, 2020

    • Pencil is a standalone app or Firefox extension* that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
      Most users think this is a great alternative to Mockup Builder.
      • Free • Open Source
      • Mac
      • Windows
      • Linux
      • PortableApps.com
      Easier to use and extensive documentation and support available
      Positive comment almost 2 years ago

      extreme intuitive and easy... no bug related
      Positive comment almost 3 years ago 3 users agree and 1 doesn't

      Non commercial, versatile, quite complete, active development, local ((you choos when and to who share your projects), exports in png, pdf, web page, vector SVG graphics or Open/Libre office format.
      Positive comment over 2 years ago

    • Diagramo is an online flowchart software- diagrams (create, edit and share)- organization charts (create, edit and share)- network diagrams (create, edit and share)-...
      • Free • Open Source
      • Online


    • Wireflow is free, online, open source, real-time collaborative tool for creating beautiful user flow prototypes.
    • 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.
      • Free • Open Source
      • Mac
      • Windows
      • Linux
      • Online
      • Self-Hosted
    • Mockup Designer, built with Backbone, Backbone-LocalStorage and Html2Canvas, is a super-easy-to-use mockup tool that uses the local storage of your browser as its backend.
      • Free • Open Source
      • Online
      • Self-Hosted
    • Open source wireframing tool written in typescript, react and redux.
      • Free • Open Source
      • Linux
      • Online
      • Self-Hosted
    • Napkee makes your Balsamiq Mockups come alive. Import a BMML and export to web or flex code in a few clicks.

      Discontinued

      The program seems to be no longer updated. Last version, 2.0 alpha 3, released on October 30, 2013, can be still downloaded from the official website.

      • Free • Open Source
      • Mac
      • Windows