Polsen turns second-by-second body data into a clear picture of how your body is responding to the day you’re having. Pair it with any screenless Polsen device to see everything from how many steps you did to how you slept.

The Reactivity Monitor™

A lot of trackers measure stress, we just do it better. Most wearables sample every few minutes and hand you one score or number at the end of the day. Polsen builds a continuous, minute-by-minute timeline instead, giving you crystal clear picture of your stress, how fast you recover, and what's quietly building up over weeks.

What you'll see in the app:

- Sleep duration, efficiency, latency and night restoration
- Night HRV & resting heart rate
- Activity, motion, steps, and heart rate zones during workouts
- Real-time stress, mapped against your actual day
- Recovery time: how quickly you return to baseline
- Cumulative stress: how stress is so building up in your body

More than just data

We give you the tools to help your health. Our app hosts a toolbox of evidence backed guided sessions like breathwork and CBT to help bring your system back down or boost your energy when needed. The app also provides personalised insights that help you connect the dots: which meetings, workouts, and evening habits move the needle, and which don't.

What Polsen won't do

No streaks. No scores to chase. No dopamine loops. We don’t believe in simplifying your data to averages or notifying you for the sake of it. The app stays quiet when the data looks good and speaks up when something's genuinely off.

Everything is free: no subscription & no paywalled metrics.

Your data, your rules

Privacy-first and opted out by default. Nothing is shared unless you choose to. Anything you do share is encrypted on EU servers and never sold.

Designed in Amsterdam. Built in Europe.

*Requires a Polsen watch (NOWATCH B or NOWATCH X). Polsen is a wellness product, not a medical device, and is not intended to diagnose or treat any condition.*