Tools like Dropbox are good for backing up and syncing files. We think that photo/video syncing & sharing among all your devices should be much easier and convenient. Many of our users are using MightyText daily to send/receive text messages. Being able to easily see and share photos from this same app will be useful to many people.
Also, Dropbox and Google Photos aren't able to sync MMS (Picture Messages) like MightyText does.