Recommended training app?

Hey all! Been trying to find an app where I can follow a plan for a 70.3. My biggest issue I’ve found so far, if I miss a session it changes nothing in the plan, and the data I’m inputting/or what’s being recorded in the sessions I am completing - it also doesn’t change anything, so I find most plans really quite rigid, and this whole tailored to you sell isn’t exactly true? Any suggestions.. much appreciated and welcome!