Terms of Use
The rules for using Nerivao, in plain words.
1. Scope and provider
These terms apply to the use of the Nerivao app for iPhone and Apple Watch and of this website. The provider is Dennis Donner, Eduard-v-Winterstein-Straße 11, 14480 Potsdam, Germany, app-support@donner.io (“I”). You get the app from Apple’s App Store; Apple’s standard Licensed Application End User License Agreement (EULA) also applies.
2. The app
Nerivao reads data from Apple Health and shows recovery, sleep, training load and stress context with explanations, trends, check-ins, a journal, experiments and an Apple Watch app with widgets. All calculations run on your device. The features available depend on your device, your iOS and watchOS version and the permissions you grant.
3. Not medical advice
Nerivao is not a medical device and does not provide medical advice, diagnosis or treatment. Its indices are pilot models that are not clinically validated. They describe patterns in your own data and can be wrong, incomplete or missing.
Do not use Nerivao to make medical decisions, and do not change, start or stop a treatment, medication or training because of it. If you feel unwell, have symptoms or questions about your health, consult a doctor. In an emergency, call your local emergency number.
4. Apple Health and Apple Watch
Nerivao depends on the data in Apple Health and on what your devices record. Some values, such as heart rate variability, sleeping wrist temperature or VO₂ max, are only available with a compatible Apple Watch worn during sleep, and their availability depends on Apple, your device model and your region. Without enough data, an index is shown with low confidence or not at all; a personal baseline takes several days to build. I do not guarantee that a particular value or index is available.
5. Your data
Your data is stored on your device only and is not included in iPhone backups. I cannot restore it for you. Use the JSON export in the app if you want to keep a copy. Your originals in Apple Health remain under Apple’s control.
6. Price
Nerivao is free. It has no in-app purchases or subscriptions, and every feature is included, also on the Apple Watch and in the widgets.
7. Availability and changes
I keep improving Nerivao and may change, add or remove features with updates, as long as this is reasonable for you. Calculation models may be adjusted; values can then differ from earlier ones. I cannot guarantee that the app is always available and without errors, or that it works on older devices and system versions.
8. Rights to the app
The app, its design, texts and graphics are protected by copyright. You receive the right to use the app for your own purposes according to Apple’s standard EULA. You may not decompile, resell or redistribute the app except where the law allows it.
9. Liability
I am liable without limitation for intent and gross negligence, for injury to life, body or health, under the German Product Liability Act and where I have given a guarantee. For slight negligence, I am only liable for breaches of essential obligations (obligations whose fulfilment makes proper use of the app possible and on which you may rely), limited to the damage that was typical and foreseeable when the contract was concluded. Otherwise, liability for slight negligence is excluded. This also applies to my representatives and agents.
10. Apple
Apple is not a party to these terms and is not responsible for the app or its content. Apple and its subsidiaries are third-party beneficiaries of Apple’s EULA and may enforce it against you.
11. Applicable law
German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. If you are a consumer, this choice of law does not take away the protection of the mandatory consumer law of the country where you live.
12. Changes to these terms
I may update these terms, for example when the app changes. The version shown here applies; important changes are announced with the app update.
13. Contact
Questions about these terms: app-support@donner.io.