AdDuplex today announced a nice new service for developers. It's called AppStretch, and it aims to be a crowdfunding platform strictly for helping an app grow. AppStretch allows users to submit new feature ideas and requests to developers. Others can come and vote on the features by sharing it on social media, though another form of voting is also done by donating real dollars. The idea is that developers will get a better idea of what their users are looking for, and the voting feature will help them prioritize the need to get those features implemented into their apps.