Fartlek

Interval training
for runners.

Pick your time and goal, hit start. 5 training styles, real-time effort cues, and Apple Watch support.

Download on the App Store
Daily Run screen with goal and duration filters
Personalized

Ready to run today?

Pick your time and goal, hit start. Filter by Speed, Strength, Stamina, Endurance, or Fun — and by duration. Your Daily Run is always waiting with a fresh recommendation.

Browse workouts by type and duration
Comprehensive

5 training styles, no guesses

Intervals, Tempo, Fartlek, Hills, and Long Runs. Browse by duration — Quick, Standard, or Long — or by type. Plus an Open Run mode to track freely with distance, time, pace, laps, and rests.

Active workout with effort indicator and next intervals
Real-time

Run by feel, not by numbers

Audio and color cues for effort zones. See your current interval, countdown timer, distance, pace, and what's coming next — all at a glance, even mid-stride.

Workout structure with effort levels and distances
Smart

Preview every interval

Know exactly what's coming before you start. See the full workout structure — warm-up, intervals, effort percentages, distances, and times for every single rep.

Apple Watch app with workout tracking
Apple Watch

Your wrist. Your workout.

Apple Watch app fully synced. See your daily run, start workouts, and track intervals with real-time effort and countdown — all from your wrist.

Everything you need.
Nothing you don't.

Designed for runners who want structure without the bloat.

Quick Start

Tap to start. No complex setup, no endless menus. Just you and the road.

Goal-Driven Training

Filter by Speed, Strength, Stamina, Endurance, or Fun — and by duration.

Audio & Haptic Cues

Get notified at the start, end, and halfway point of each rep — even with your screen off.

HealthKit Integration

Automatically save workouts to Apple Health for a complete fitness record.

Favorites

Bookmark your go-to workouts for instant access when you need them.

GPS Tracking

Accurate distance with smart smoothing to avoid drift during rest periods.

Ready to
run faster?

Download on the App Store