Proto.io

Proto.io is a web-based prototyping tool for creating interactive, low- or high-fidelity prototypes for web, iOS and Android without coding. It addresses the need to turn ideas into realistic, testable prototypes that communicate functionality and design intent. The drag-and-drop editor provides building blocks, UI component libraries, templates, and digital assets, while interaction and animation features let users move from simple wireframes to prototypes that feel real.

Key capabilities include a 100% web-based editor with drag-and-drop, keyboard shortcuts, grid and guide systems, and version control. The tool supports UI component libraries for iOS, Material Design, Windows, and watchOS, along with templates, patterns, icon libraries, animated icons, and sound effects. Users can work with audio, video, GIF, and Lottie animations, create scrollable containers, reusable containers, custom components, and webview or HTML code components. Interactions cover touch events, gestures, mouse events, keyboard events, screen events, drag and rotate, and parallel or sequential interactions. Design tools integrate with Sketch, Figma, Adobe XD, and Adobe Photoshop, and fonts can be imported from Google Fonts or Adobe Fonts. Collaboration features include share links, comments, export to HTML, PNG, or PDF, and preview on web, mobile browsers, or native iOS and Android apps.

Proto.io is aimed at UX designers, entrepreneurs, product managers, marketers, developers, and product teams. It is packaged with a 15-day free trial requiring no credit card, followed by a free limited-feature plan or paid subscription plans. Paid plans are seat-based and tiered by number of users and active projects, with unlimited reviewers included. Enterprise plans offer additional users, unlimited projects, SSO, and enterprise-grade security. Education plans are available for educators and students, and students and non-profit organizations can receive a discount.