Sites and apps similar to Montage Prototyping include Penpot, which is open source with a free version. Other options are Figma, Open Pencil, Lunacy and Balsamiq Wireframes. You're spoiled for choice with Prototyping Tools like Montage Prototyping: we list more than 50 alternatives for Mac, Windows, Linux, iPhone and iPad.
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.
Spain
EU
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.
United States
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.
Russia
Cross-platform vector editor for UI, UX, and web projects with native .sketch file editing, real-time multi-user collaboration, an AI-backed asset library, code and asset export, Figma integration, offline use, seamless cloud management, and auto layout tools.
United States
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.
United States
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.
NetherlandsEU
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.
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.
United States
A streamlined web app that helps you create and collaborate in real-time on wireframes, mockups, diagrams and prototypes.
RomaniaEU
ProtoPie is the easiest tool used to turn your UI/UX design ideas into highly interactive prototypes for mobile, desktop, web, all the way to IoT.
South Korea
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.
United States
Quant-UX is an integrated Prototyping and Analytics software. It allows you to design, test and analyze interaction prototypes.
