Do you know proto.io ?
@jjosealonso I checked it out a little bit the downsides are just too great.
Here's a list at to why you shouldn't use that service<br />
1) It's a freemium service with your work walled/hosted on their servers.
2) Requires an internet connection
3) Closed source website
4) You trust that their servers are secure enough to protect your work
Please let me know what you think.
@runexec Really, the main difference is that proto allow build interactive prototypes, today i try some hours pencil, and its a good software (You are the developer?) i want to know if is possible change the blue colors of active tabs or actionbars for example...