Top 30 Cross‑Platform UI Prototyping Apps for Mobile and Web

Browser‑based design and prototyping platform with real‑time collaboration, vector editing, and interactive components.

Vector‑based UI/UX design tool with responsive resize, auto‑animation, and cloud‑based sharing for mobile and web prototypes.

All‑in‑one screen design, animation, and prototyping suite with shared design systems and seamless handoff.

High‑fidelity prototyping tool supporting conditional logic, adaptive views, and data‑driven interactions.

Web‑based prototyping platform with simple drag‑and‑drop, user testing, and handoff features.

Full‑featured prototyping app for mobile and web with realistic animations, device preview, and user testing integration.

Design‑to‑code prototyping tool that combines visual design, React code, and interactive animations.

Collaborative design system platform offering advanced interactions, states, and conditional logic.

Low‑fidelity wireframing tool focused on rapid sketch‑style mockups for early‑stage design.

Desktop and web prototyping suite with rich UI libraries, adaptive views, and usability testing.

Open‑source, web‑based design and prototyping platform that runs on any OS and supports SVG editing.

Free macOS tool (also runs on Windows via cloud) for high‑fidelity interactive prototypes, built by Facebook.

Rapid prototyping software with drag‑and‑drop components, interactive links, and team collaboration.

Web‑based wireframing and prototyping suite with UI libraries for mobile, web, and desktop.

Online prototyping tool focused on mobile app flows, with native device preview and sharing.

Visual web design platform that lets you build responsive sites and prototype interactions without code.

Plugin for Figma, Sketch, and Adobe XD that adds high‑fidelity responsive prototypes and code export.

No‑code interactive design tool for web experiences, offering timeline‑based animations and live preview.

Design handoff and collaboration platform that also supports interactive prototypes and style guides.

Simple web‑based prototyping and user testing platform with integrations to Slack, Jira, and more.

Powerful prototyping tool that lets you create complex interactions using a visual logic editor.

Open‑source animation library for React that enables rapid interactive prototype creation directly in code.

Mac‑first vector UI design tool with cloud‑based sharing and prototype preview across platforms.

Cross‑platform vector design app with prototyping capabilities and cloud sync.

Professional vector graphics editor that supports interactive mockups via plugins and export.

Free Windows‑native design tool from Icons8, compatible with Sketch files and offering basic prototyping.

Integrates code components into UXPin prototypes, enabling design‑to‑development sync.

Component‑driven design tool that blends UI design with React code for interactive prototypes.

Lightweight web‑based prototyping add‑on for rapid mobile UI mockups with instant sharing.

Enterprise‑grade interactive content creation platform for rich web experiences and prototyping.

Mac‑centric prototyping app with timeline‑based animation, also usable on Windows via web preview.

All‑in‑one design system and prototyping environment with real‑time collaboration.

3D design and UI prototyping platform that lets you embed interactive 3D components into web prototypes.