Amazing Drafting app.
I have used Omnigraffle Pro on my Mac to make isometric line and assembly drawings for a number of years. I recently downloaded Version 2.5.1 for my iPad Air 2. Last night I realised that I had to make significant changes to an assembly drawing that I had created on my Mac and stored on iCloud Drive. I was able to retrieve it on my iPad and make all my required modifications with ease. I was very surprised how the interface has been adapted to accommodate touch screen implementation. It is very well done.
SMican about
OmniGraffle 2