Great Tool but needs collaboration

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I've used this tool for two projects.

- The prototypes are very polished and can be viewed on the web or on your mobile device.
- You can set a custom launch icon and splash screen so it looks like a native app.

- I need to collaborate with people in other locations and time zones so the ability to add comments and track changes is a must have.
- It only handles mobile apps. Most of my mobile apps have a web portal companion so a website template and components would be required to meet all my needs.