Open Stress: HRV Notifier

Stress level insights & alerts

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Eligible new subscribers get 7 days free, then $9.99/year in the U.S. See each Apple Health HRV reading in private, personal context. Open Stress is a privacy-first iPhone wellness app for HRV observations already stored in Apple Health. It turns those sparse readings into on-device views of the latest raw SDNN value, a 28-day personal baseline, a personal HRV level, a separate personal stress estimate, and 7/30/90-day trend summaries. The app is designed around observations, not continuous monitoring. Today shows raw HRV in milliseconds, not a percentage. Trends reports counts and shares of observations rather than inventing stress duration. Insights explains freshness, context, baseline coverage, and evidence-labeled actions such as slow breathing, regular aerobic activity, sleep support, less evening alcohol, and smoking cessation. Open Stress reads Apple Health HRV. When iOS delivers a new qualifying observation, optional notifications can provide a local, timestamped update. The app has no account, product server, ads, or third-party analytics. Data are completely local on your iPhone. There is no account, sign-in, backend servers. As all apps should be. An auto-renewable annual subscription unlocks full access. Eligible new subscribers receive a 7-day free trial; Apple determines eligibility. There is no charge during the trial. After the trial, the U.S. price is $9.99 per year, and the App Store shows your localized price before purchase. Unless canceled at least 24 hours before the trial or current subscription period ends, the subscription renews automatically each year. You can manage or cancel it in App Store account settings. Privacy Policy: https://kiskir.dev/projects/open-stress/privacy Terms of Use: https://kiskir.dev/projects/open-stress/terms Disclaimer: Open Stress provides personal wellness estimates, not medical diagnoses. HRV can change for many reasons, and one observation is not the whole picture.

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The developer, Sihang Chen, 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 Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Sihang Chen
    Size
    • 5 MB
    Category
    • Health & Fitness
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    13+
    • 13+
    • Learn More
    • Infrequent
      Alcohol, Tobacco, Drug Use or References

      Contains
      Health or Wellness Topics
    In-App Purchases
    Yes
    Copyright
    • © 2026 Sihang Chen
  • Developer Website
  • Privacy Policy

    • More by Sihang Chen

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