crazyRun brings professional-grade structured training to every runner. Plan intervals, tempo runs, fartlek and long runs on your iPhone, then execute them with real-time guidance on your Apple Watch, or with the iPhone alone — heart rate, pace, GPS and cadence always in front of you.
What crazyRun does
Structured Workouts
Build intervals, tempo, fartlek, warm-ups and cool-downs. Import workouts by text notation. Repetitions and sub-phases supported. Every plan carries its sport: running by default, or cycling and hiking when you say so.
Running, Cycling and Hiking
Three sports, each with its own physics: pace in min/km for running and walking, speed in km/h on the bike, and different margins so a 45 km/h descent or a 2 km/h climb both record properly. Each one is saved to Health under its correct type.
Free Workout
No plan? No problem. Run, ride or walk from the watch or from the iPhone, with its GPS, for as long as you want. All metrics captured, no time limit.
GPS Tracking
Full route map with elevation profile. Interactive tooltips showing altitude, distance and time at any point. Export to GPX.
Heart Rate & Zones
Live HR from Apple Watch. Zones worked out as a percentage of your maximum, which the app derives from your own workouts. Session TRIMP and training load over time.
Apple Watch App
Full workout control from your wrist. Pace, HR, cadence, phase timer and distance alerts with haptic feedback — always on foreground.
Deep Statistics
Pace chart, hierarchical split table, personal records, race predictor (Riegel formula) and session comparison across workouts.
Syncing
Workouts recorded on the Watch reach the iPhone automatically. Between your own devices you choose how: staying on the device, over your local network, or through your iCloud account. Backups are made by hand and exported via email, AirDrop or Files.
Calendar & History
Visual calendar with planned and completed workout dots. Full session history with search and filters by type, date and distance.
17 Languages
Arabic, Bengali, Catalan, Chinese (Simplified and Traditional), English, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Portuguese, Russian, Spanish and Thai.
📖 Complete User Manual
Learn how to create workouts, configure every option, and get the most out of crazyRun.
Read the Manual →crazyRun does not collect, store or share any personal information. No account required. No analytics. No ads. Ever.
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