Free forever · iOS only · No subscription
Free guide · iPhone camera TRIMP turns your heart rate during a workout into a single number representing training stress — helping you balance load and recovery without guesswork.
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91 BPM
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Learn & Track — All in One Free App
Pulse Rate turns complex biometric concepts into simple daily habits. Measure, track, and understand your body using just your iPhone.
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4.8
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Syncs with Apple Health. Instantly.
Import your workouts from Apple Health to combine activity history with camera-based readings. Every measurement syncs back to your health dashboard automatically.
How it works
TRIMP = Duration × Average HR × Intensity Weighting. The higher your heart rate relative to max, the more stress each minute contributes to your daily score.
After a session, open Pulse Rate and record your workout duration. The app uses your heart rate zones to calculate a TRIMP score automatically.
Review your weekly TRIMP totals in the trends view. A sustainable training week typically shows gradually increasing load with planned lower-load recovery days.
When your weekly TRIMP spikes significantly, your body needs more time to adapt. Use the morning HRV reading to confirm readiness before your next hard session.
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Free iOS Download
Your iPhone camera is all you need. No wearable, no subscription, no credit card. Just download and take your first reading in 60 seconds.
Download Free AppFor fitness and wellness purposes only. Not intended for medical diagnosis or treatment.