Nerivao: Sleep & HRV Tracker
Recovery, Stress & Body Data
Free · Designed for iPhone. Not verified for macOS.
I built Nerivao to answer one question every morning: what is different with me today – and what is that based on?
Nerivao reads your data from Apple Health, compares it with your own personal range and shows you in plain language what stands out. Every value shows where it comes from. When data is missing, Nerivao says "No data" – I don't fill gaps with made-up numbers.
SLEEP
• Sleep stages from your Apple Watch – REM, core, deep and awake – as a clear hypnogram
• Time asleep, time in bed, interruptions and your personal sleep goal
• Heart rate, HRV and respiratory rate during the night
RECOVERY & STRESS
• HRV, resting heart rate and other values compared with your own last 28 days instead of other people's averages
• Recovery and stress estimates based on your personal baseline – with an explanation of what contributes and how much
• An honest learning phase: estimates only appear once there is enough history
BODY & TRAINING
• Resting heart rate, HRV, respiratory rate, blood oxygen, wrist temperature, steps and energy – each with source and time
• Workouts from Apple Health with duration and optional perceived exertion
• Trends over 7, 30, 90 and 365 days
HOW YOU FEEL
• A quick check-in for energy, muscles, sleep feel and stress
• A journal with your own tags, such as caffeine or screen time – anything unanswered stays unknown
• Experiments: follow one habit and compare how things looked before and after
APPLE WATCH & WIDGETS
• Your daily summary on your wrist and on your Home Screen
• Apple Watch recommended, not required – Nerivao uses the data your devices record
PRIVATE BY DESIGN
• All calculations run on your iPhone
• No account, no health cloud, no cloud AI
• Read-only access to Apple Health; export or delete your entries at any time
Your feeling counts: if you feel tired on a "good" day, Nerivao records that instead of overruling you.
Nerivao is meant for fitness and wellness orientation. It does not diagnose any condition and is not a substitute for medical advice. If you have health concerns, please talk to a doctor.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New: time in daylight and how it relates to your sleep.
New: your heart rate through the night, right below your sleep stages.
New: sleep window and bedtime over recent nights.
New: breathing disturbances compared with your usual range.
New: mindful minutes and mood next to your sleep.
Naps now count toward your sleep goal and trends. Swipe through the sleep stage chart.
Enjoying the app? I'd really appreciate a rating on the App Store.
The developer, Dennis Donner, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Dennis Donner
- Size
- 38.2 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later. - Apple Watch
Requires watchOS 11.0 or later.
- iPhone
- Languages
English and 15 more
- English, Danish, Dutch, French, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Traditional Chinese, Vietnamese
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- Copyright
- © 2026 Dennis Donner