Your watch measures speed.
Not effort.
A 9:12 on a hill isn't a 9:12 effort.
A 9:00 when you're fatigued isn't the same as a 9:00 when you're fresh.
Effort Pace measures what that speed is costing you — adjusting for the terrain and for how your body is responding today.
Hill run
Pace: 9:12 → Effort Pace: 8:04
You're working harder than it looks.
Pace: 9:12 → Effort Pace: 8:04
You're working harder than it looks.
Tired Tuesday
Pace: 9:00 → Effort Pace: 9:25
Your "easy" pace isn't easy today.
Pace: 9:00 → Effort Pace: 9:25
Your "easy" pace isn't easy today.
One number on your wrist, updating in real time.
Stay in Zone 2 on any terrain without guessing.
Apple Watch · Always free · No account required
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Built by a runner in Indiana who got tired of pace lying on hilly days.
Your data stays on your device.