Support
Help with Nerivao for iPhone and Apple Watch.
Contact
Email app-support@donner.io. Please describe your iPhone and Apple Watch, the iOS and watchOS versions and what you expected Nerivao to do. Screenshots help; please do not send exports or Health data unless I ask for them.
This website has no contact form. How I handle your email is described in the Privacy Policy.
Frequently asked questions
Does Nerivao need an account?
No. There is no Nerivao account and no Nerivao cloud. Nerivao reads Apple Health on your iPhone and stores its results, check-ins and journal there. A connection is only needed for the app’s analytics and crash reports.
How do I change which Health data Nerivao can read?
Open iOS Settings → Health → Data Access & Devices → Nerivao and switch categories on or off. Nerivao only reads; it never writes to Apple Health or changes your Health data.
How long until my indices appear?
Nerivao compares each day with your personal baseline. After about 3 to 6 nights with data, you see an early estimate marked “Low confidence”; from about 7 days the baseline is regular. Stress context needs about 14 days. Wearing your Apple Watch at night helps most.
Why is an index missing or marked with low confidence?
Usually a value is missing for that day, for example no sleep recording, no heart rate variability or no wrist temperature, or the permission for that category is off. The index details and Methodology show which inputs an index needs.
Does Nerivao work on Apple Watch?
Yes. The Watch app shows a short daily summary from your iPhone and lets you log your energy; the check-in goes back to the iPhone. Values on the Watch and in widgets are hidden until you turn on “Show values on Watch and widgets” in the settings.
How do I keep a copy or move to a new iPhone?
Nerivao’s database is not included in iPhone backups. Use Export in the settings to save a JSON file covering 7 to 365 days. Your Apple Health data itself moves with your iPhone or iCloud as usual, and Nerivao can read it again on the new device.
How do I delete my data?
Use “Delete all local data” in Nerivao’s settings, or delete the app. This removes Nerivao’s database, the widget summary and the Watch copy. Your originals in Apple Health are not touched.
Does Nerivao cost anything?
No. Nerivao is free for everyone, with no in-app purchases and no subscription. Every feature is included, also on the Apple Watch and in the widgets.
Can Nerivao tell me if I am ill?
No. Nerivao is not a medical device and does not diagnose anything. Its indices are not clinically validated. If you feel unwell or are unsure about your health, consult a doctor.