Klenz syncs your workouts, sleep, steps, calories burned, resting heart rate, and heart rate variability through Apple Health and Health Connect — then connects how you recover with what you eat.
Klenz connects to Apple Health on iOS and Health Connect on Android. Any device that writes to those platforms flows straight into Klenz — Apple Watch, Fitbit, Garmin, Oura, Whoop, Samsung Galaxy Watch, or just your phone's built-in step counting. No extra hardware, no separate accounts to link.
Once connected, Klenz stays in sync automatically. Your activity shows up alongside your meals, so your training and your nutrition finally live in one place.
Your tracker records two numbers every night that describe how well your body recovered: resting heart rate and heart rate variability. Klenz reads both and builds a 30-day personal baseline for each — then tells you in plain language whether your recent readings are typical for you, above your usual, or below your usual, with your own normal range next to the number. No population charts, no readiness score, no verdict.
Because those readings sit on the same screen as your meals, the question "what changed?" has an answer: the late dinner, the wine, the short night. Read the full guide to resting heart rate and HRV for what the numbers mean and what moves them.
This is what makes Klenz different from a fitness dashboard. Klenz looks at your recent training alongside the 31 nutrients tracked from your meals — and surfaces patterns between the two. How your carbohydrate intake lines up with your endurance sessions. Whether your protein is keeping pace with your training load. What your eating looks like on the days you train hardest.
These aren't generic fitness tips. Each insight comes from your own logged meals and your own synced workouts. Insights describe patterns in your data — they're not medical or training advice.
The activity view gives every metric its own card: sleep duration with a stage breakdown, daily step counts with distance, workout sessions by type, active calories burned, and your resting heart rate and heart rate variability plotted against your personal range. Switch between day, week, and month views and drill into any day for the full detail.
Klenz only reads your health data, and only the types you approve — it never writes anything back to Apple Health or Health Connect. You grant and revoke access anytime from the Health app on iPhone or Health Connect on Android, and Klenz shows you exactly what it has permission to see.