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Go to Settings → Health → Data Access & Devices → Nerva and make sure read access is enabled for HRV, Heart Rate, and Sleep Analysis. Without these permissions the app cannot calculate your score.

Scores are calculated by comparing your current data against your personal baseline built from past records. If you are new to the app or don't have enough HealthKit history, the app defaults to "Balanced" as the safest option. Accuracy improves after a few days to a week of use.

Make sure your iPhone and Apple Watch are connected via Bluetooth and that the Nerva Watch app is installed. Open the iPhone app once to trigger a score update — the Watch will sync automatically after that.

On your iPhone, go to Settings → [Your Name] → Subscriptions, tap Nerva, then tap Cancel Subscription. Cancellation takes effect at the end of the current billing period.

Tap Restore Purchases in the app's Settings screen. Purchases can only be restored using the same Apple ID used at the time of purchase.

Scores are stored locally on your device. Deleting the app removes all local data. If iCloud Backup is enabled for Nerva, data may be restored after reinstalling the app.

Make sure you are running iOS 17 or later and that the app is up to date. If the issue persists, please contact us with your iOS version, device model, and a description of what happened.

No. All HealthKit data is processed entirely on your device. Nothing is transmitted to our servers or any third party. See our Privacy Policy for full details.