Thanks for the hint on a different channel; installed on iPad Mini 3 and iPad Pro 12" (v1). On the iPad Pro I have so far 92 on a DRUGS Phase 2.
What I a bit dislike is the fact that is seems not aggregating across devices (even when under the same Apple ID). And no team setup.
Else I like that (finally) some VC can be done on iOS. Though its painful as I need to keep the device unlocked the whole day. Not really nice as it give access to eMail etc.
I should also point out that though they are on Android and have been for a while, they appear to have added an iOS app probably around March this year. This makes it the only DC app on iOS that I am aware of.