Proto.io

Proto.io is an online tool for building both low and high-fidelity prototypes. It supports web, iOS, and Android designs with a user-friendly drag-and-drop interface.

Key Features

• Drag and drop functionality for easy design.
• Supports interactive and animated prototypes.
• Collaboration features for team feedback.
• Integration with popular design tools.
• Preview prototypes on multiple devices.

Pros

• User-friendly interface with no coding required.
• Quickly iterate and test ideas.
• Freemium model allows initial use for free.
• Strong support for interactive elements.

Cons

• Limited features in the free version.
• Export options may be restricted.
• Performance can lag with complex prototypes.
• Learning curve for advanced features.