Smart Runner builds an adaptive 5K-to-marathon plan from one race result and rebuilds it after every run. Paces come from your VDOT, load tracking is the usual ATL/CTL/TSB, and workouts follow Pfitzinger, Daniels and Canova. Native Apple Watch app with live pace and HR zones. Two things make it different: it's a one-time purchase, not a subscription, and it runs entirely on-device. No account, no server, nothing leaves your phone. 14-day free trial.