Axure RP is described as 'The leading tool for rapidly creating wireframes, prototypes and specifications for applications and web sites' and is a Prototyping tool in the development category. There are more than 50 alternatives to Axure RP for a variety of platforms, including Windows, Mac, Web-based, Linux and iPhone apps. The best Axure RP alternative is Penpot, which is both free and Open Source. Other great apps like Axure RP are Figma, Pencil Project, Sketch and Open Pencil.
Open-source design platform offering web-based and self-hosted workflows, code inspection in HTML and CSS, adaptive layouts with CSS Grid and Flex, real-time collaboration, auto layout features, reusable components, design tokens, layer support, plugins, and no tracking.
Figma is a web-based platform offering a robust set of tools for vector graphics editing and prototyping, along with offline desktop apps for seamless workflows. Designed specifically for UI and UX design, it emphasizes real-time collaboration, visual versioning, and vector networks to streamline the designer's work.
Pencil is a standalone app that lets you create diagrams or UI mockups. It doesn't have collaboration/multi-user features.
Vector-based Mac design app focused on UI, UX, web, and mobile with responsive artboards, prototyping, plugin support, real-time collaboration, reusable libraries, non-destructive editing, cloud feedback, and device preview via companion mobile app.
Open-source design editor for vector and interface projects featuring AI-powered generation, .fig and .pen file support, design-to-code export, real-time P2P collaboration, linting, tokens, advanced programmability, Vue SDK, and privacy-friendly operation.
Sketch your app ideas without stress Make hand-drawn style wireframes quickly and easily.
An open source wireframe to app tool powered by Llama 3.2 vision. Upload a screenshot of a simple site/design & get code.
Combines code-driven and visual editing workflows for interactive UI design, high-fidelity prototyping, real-time team collaboration, reusable components, inline commenting, mobile previews on Android/iOS, and smooth developer handoff for efficient workflow.
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.
OmniGraffle can help you make eye-popping graphic documents—quickly—by providing powerful styling tools, keeping lines connected to shapes even when they’re moved, and magically organizing diagrams with just one click.
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 streamlined web app that helps you create and collaborate in real-time on wireframes, mockups, diagrams and prototypes.
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I have used Pencil Project for a couple of projects and it is good for app designing.