From Sendtiment:

We are extremely proud of all that we've accomplished and learned on this incredible journey. Our vision was to help all the Windows Phone users be more thoughtful with each other by giving them an app at a time when it seemed no one really cared about the Windows Phone community. We believe we accomplished that as we were recognized multiple times by Microsoft including being named as one of the Top 5 apps using the digital assistant Cortana in the most innovative way this past summer.

We've learned a lot from all our users and one of the lessons was that we still had a lot more work to do to make the app truly great. Unfortunately this work requires resources that are not available to us.

Thanks to our users, all the blogs and websites that believed in us, Microsoft, and all of the #WinPhan champions that have allowed us to pursue and achieve our vision to help you be there for the moments that matter.