
I initially used Parse as an easy way of integrating push notifications into a native iOS application I developed. Its very well designed and easy to add to an application with minimal headaches. If you plug in additional data points, Parse makes it easy to target messages to specific users or groups of users that match certain attributes. Review collected by and hosted on G2.com.
One of the best things about Parse is that it's currently managed and operated for you. In January 2017, you'll need to host the service yourself in order to continue using it (http://parse.com/migration). That said, it's still immensely valuable even if you have to host it yourself. Review collected by and hosted on G2.com.