The best thing about Clym is that you can send out text messages to multiple people at one time, rather than doing it individually. There are also some nice features like being able to send an automated message when someone opens the app, or if a certain period of time has passed since they last opened the app. You cannot delete individual messages without deleting everything associated with them. Clym does not have any in-app messaging yet. If there were such a feature, it would make texting friends fun! I use Clym mostly for group messaging because it's convenient for me.