Proto.io

Proto.io is a web-based design tool that’s used to create fully interactive prototypes.

Proto.io offers a drag-and-drop UI with no coding required. Using Proto.io its possible to create a prototype really quick because the whole library of interactions is integrated and ready to be applied to any layer of the screen.

Cost $24/m., paid annually for 5 active projects. There are also higher priced plans for 10, 15, or 30 active projects
Platform Web
Import assets from Photoshop Sketch Dropbox
Ideal for Web, Mobile

Pros

  • Preview animations right in the editor as you craft your motion design
  • Extensive library of standard UI elements, many of them customizable
  • Effective simulation of high-fidelity interaction behaviors(it's possible to add animation to individual elements and transition effects between the views; gesture-based interaction are supported)

Cons

  • There's a learning curve (not easy to use for a first-time user)
  • Designed needs to build out screens in the tool (it's difficult to reuse existing mock-ups as starting point)
  • Animations can become slow when you add many interactions
  • All your prototypes are saved on Proto.io web platform (it means that you can’t use them when you would cancel your account)
  • No live preview
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