- RunPlan is a running coach app for iPhone and Apple Watch, built by Dan and Katya over 1.5 years.
- Users input a race goal and a recent race result, and the app generates a full training plan with weekly workouts, paces, and structure.
- The plan engine uses a deterministic Swift package based on classic coaching methods (Jack Daniels, Pfitzinger, Higdon), ensuring consistent, reproducible plans.
- The app is free now, with no subscription planned; the founders want to keep running affordable.
- On the Watch, it provides real-time guidance: intervals, pace windows, wrist taps for transitions, and saves data to HealthKit.
- The code is publicly available on GitHub, encouraging community feedback and audits.
- The team documents challenges publicly, including technical struggles and unresolved problems.