
Fluid UI

Communicate the functionality behind your designs and improve communication Add different levels of interactivity based on your project's needs and go from a simple wireframe to a prototype that feels real
Take your prototype's interactivity one step further by introducing micro-animations with Proto io's powerful animation features
Connect your screens together with any one of the 18 smooth, out-of-the-box transitions like slide, push, pop, and many more
Timeline-based state animations that give full control to animate any layer, any way you want Adjust timing, easing, duration, and fine-tune to perfection
Change any property on the fly Apply animation effects, filters and shadows Change opacity, colors, fonts, rotate, resize or scale Animate with no limits
Explore your prototype on the web or on a mobile browser Use the Proto io native apps for iOS or Android while prototyping for easier previewing or for viewing offline
Send a single or multiple Share links Export to PDF, PNG or HTML to view offline Share a snapshot of your prototype at an exact point in time
Give & receive feedback with comments User test with popular user testing platforms
Our huge library of resources includes documentation, sample projects, video tutorials, step-by-step guides, and webinars to get you started or take you to the next level
Our friendly support team is always willing to help and dive in when asked, to assist you with your project on a case-by-case basis
Work alone or in a team of any size Our flexible granular security model can accommodate the needs of any size Encrypted and secure
"It helps us to develop a realistic prototype with complex features quickly This leads to a very powerful demo for client buy-in of the design " "Robust features make this tool stand out Other non-code-based UI prototyping tools I've used lack the range of features-like animation and gesture support-that Proto io offers " "Proto io is our tool of choice for prototyping mobile interactions in the concept phase I found the custom transitions especially helpful in articulating the vision of the app to both customers and stakeholders " Director of Mobile Design "Proto io is one of the best tools available to make prototypes come to life It's extremely easy to use and it comes super handy to quickly explain interactions, gestures and layout to both peers and clients "
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Updated 8/11/2026
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