This app was mentioned in 7 comments, with an average of 1.43 upvotes
1.) There's an app for Android (TouchDAW) which works if you're on the same network. I don't know if it's available for IOS, but here's the Google Play link for Android:
https://play.google.com/store/apps/details?id=de.humatic.tdaw
I know it works well. I've tried the demo. (I did not buy it because I have a wireless keyboard which works just fine across my tiny room.)
TouchDAW might be useful if you have an android tablet
Nope, but have you tried TouchDAW?
Ever tried TouchDAW?
Not for Bitwig only, but Touchdaw works. Demo available to try https://play.google.com/store/apps/details?id=de.humatic.tdaw
Maybe this is what you're looking for...
https://play.google.com/store/apps/details?id=de.humatic.tdaw