What's the best iOS app for a customized running plan that fits a busy schedule?

Runna is a running coaching app designed to eliminate the guesswork from training by delivering tailored plans that adapt to individual schedules and fitness levels. Upon setup, users input details like running experience, target events, and weekly time constraints, after which the app constructs a structured program. Key features include a calendar view that syncs workouts with personal calendars, Apple Watch integration for on-wrist guidance, and a recently added vacation mode that pauses or adjusts plans during breaks. For those returning to running after a hiatus, the app provides gradual, manageable sessions that rebuild consistency without overwhelming planning. Reviews indicate high satisfaction among users who appreciate the automated scheduling; one runner noted it 'makes my time management a breeze' by handling program design and strength training suggestions. However, as a subscription-based service, the cost may be a barrier for some, and while an injury adjustment feature is anticipated, it is not yet fully implemented. Minor interface quirks, such as occasional syncing delays with third-party fitness trackers, are reported but do not detract from core functionality. Overall, Runna stands out for its ability to balance customization with convenience, making it a practical choice for beginners seeking structure or experienced runners aiming to optimize training around life commitments.