The best free alternative to Axure RP is Pencil Project, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Axure RP and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to Axure RP are Penpot (Free, Open Source), Apache OpenOffice Draw (Free, Open Source), Marvel (Freemium) and Moqups (Freemium).
Penpot is the first Open Source design and prototyping platform meant for cross-domain teams. Non dependent on operating systems, Penpot is web based and works with open web standards (SVG). For all and empowered by the community.
Draw, part of the Apache OpenOffice suite, is a graphics editor that gives you the tools to communicate with visuals and diagrams. With a maximum page size of 300cm by 300cm, Draw is powerful tool for posters, graphs, charts, and more.
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Apache OpenOffice Draw vs Axure RP opinions
This alternative is disputed. Apache OpenOffice Draw is still a legitimate alternative to Axure RP, but it might have issues that some users think are important.
OpenOffice is a great set of tools, but Draw just does not have the functionality of Axure. Axure RP is a prototyping tool that lets you create a prototype of a complete website with some complex logic to demonstrate some functionality, draw just doesn't have a toolset for that as far as I know
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. However the data layer is loosely coupled, so you can integrate with any RESTful API or any Backend service.
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.
Nothing to download/install, create and access your mockups from anywhere. Add pages with templates and define links to present a clickable prototype. Our components are of medium-fidelity not very sketchy or look too real. Its just right.