Is there a mobile app for RO DBT?

Yes there is! Grow RO have developed a Diary Card app (available in the Apple app store) that is intended to be used alongside your RO DBT therapy.

Videos Explaining how to use the app

App Demonstration by the app developers: https://youtu.be/kg8_f5b3Lt0
App Promo Video: https://youtu.be/MxypUHKk51Y  
RO DBT Diary Card App Demo: https://youtu.be/1ZVDgSj7Tjc  
RO DBT App Features - long: https://youtu.be/UPfsxd2VZ6I  
RO DBT App Features - short: https://youtu.be/GKxr0NBFwNg