Really useful App
Great app with all the features you need, good case studies and especially useful is having your indemnity certificate to hand.
Yes, DDU is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
DDU is free.
To get estimated revenue of DDU app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.
Great app with all the features you need, good case studies and especially useful is having your indemnity certificate to hand.