Proto.io

Designer, developer, product owner or product visionary? If you want to build a successful product, you need to start by successfully communicating your vision. With Fluid UI, ideas can be prototyped in minutes and shared instantly. Sharing, feedback and collaboration are all built in. Start with a free account and unlock your creativity. What’s in your mind and what people understand are often worlds apart. A good prototype paints a thousand pictures. It connects the dots for everyone to see. Time is short too. There’s a lot to get done. That’s why Fluid UI focuses on fast, easy and fun. We know it’s the right way to present your ideas successfully to the world. Use a comprehensive set of pre-built UI Kits for Material Design, iOS, Wireframing and more. Real-time collaboration lets your entire team work together on the same prototype at the same time. Visually linking your prototype together makes adding interactions fast, fun and productive.

Mockup is a powerful UI/UX design app for iPhone, iPad, and Mac, built for ideation, wireframing, and prototyping. Sketch interfaces with Apple Pencil, create low-fidelity wireframes, organize flows, and preview interactive prototypes—all in one flexible canvas. Design with 45+ device frames, customizable grids, shapes, text, images, SF Symbols, and reusable UI elements. Drag and drop assets, align and distribute objects, and create polished layouts quickly. Build interactive prototypes by connecting frames and previewing full user flows. Mockup is optimized for Apple Pencil, including Hover and Apple Pencil Pro squeeze gestures, and supports multitasking, external keyboards, trackpads, SharePlay collaboration, iCloud sync, widgets, PDF/PNG export, and more. Trusted by over 500,000 designers, developers, and teams worldwide to brainstorm, wireframe, and bring ideas to life faster.