Protonotes are notes that you add to your prototype that allow project team members to discuss system functionality , design, and requirements directly on the prototype. You can think of it like a discussion board/wiki in direct context of your prototype. Once you have signed up with Protonotes, all you have to do is share your unique Protonotes url with your project team members and they can begin adding notes to the prototype - they do not have to sign up.

Discussion Board + Wiki * (Prototypes) = Protonotes

Protonotes is also a great tool for recording your findings in usability tests and heuristic reviews.

• Everyone on your team can easily add notes to your prototypes - helps the entire team collaborate quicker and easier.
• You don't need to install anything (IE is required).
• Once you've signed up, all you have to do is email out your Protonotes link - nobody else has to sign up.
• It's free.

• Mentioned in the Wall Street Journal article, "A time for sharing".
• Written up in Ajaxian.
• Reviewed by Mashable.
• Discussed in eHub.
• Featured in Killer Startups.
• Profiled in Rev2.
• Mentioned in SensoryMetrics.
• Mentioned in CRE8PC.