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Guide
FAQ
  • About Feelmo
  • Contact
  • Privacy Policy
  • Terms of Use
feelmo.jp
Lumo
  • 日本語
  • English
  • 한국어
  • 中文
  • ไทย
  • Guide

    • Getting Started
    • Living with Feelmo
    • Your First Week
    • Reading the Screens
    • Apple Watch & HealthKit
    • HealthKit Data
    • Notifications & Reminders
    • Watching from Your Home Screen
    • Using the Emotion Log
    • Adjusting the Mood
    • Regulation Score
    • How Your Score Grows
    • Morning Check-in & Tomorrow's Outlook
    • Understanding HRV
    • The Science of Regulation
    • The Brain–Heart Connection
    • Sleep & HRV
    • Exercise, Recovery & Readiness
    • Heart Rate & Resting Heart Rate
    • Age, Sex & Individual Differences
    • Common Misconceptions
    • The Six Companions
    • Breathing Sessions
    • Mindfulness & HRV
    • Behavior Log & AI Coach
    • About Feelmo Pro
    • When No Reading Arrives
    • Data & Privacy

HealthKit Data

We disclose, in full, what data Feelmo exchanges with Apple's Health app (HealthKit). What it reads, what it writes, and what it does not do — trust, we believe, begins here.

Data Feelmo reads

To measure and watch over your regulation, Feelmo reads the following from HealthKit. Every item we may use is shown to you in full, in a single list at first onboarding, and requested all at once — we never come back later with a surprise extra ask. You can revoke any data type at any time.

DataWhat for
Heart rate variability (HRV / SDNN)The core metric of the Regulation Score
Heart rateAs background, such as resting heart rate
SleepTo read regulation mainly from heart data during sleep
Steps & workoutsTo watch the relationship between behavior and regulation (behavior log)
Ambient light / daylight (where available)To watch the relationship between sunlight and regulation (behavior log)

About RMSSD

Feelmo emphasizes RMSSD as a parasympathetic index, computed from the heart-rate-variability data it reads. See Understanding HRV for more.

Data Feelmo writes

Feelmo writes just one thing to HealthKit.

DataWhat for
State of MindTo keep your logged mood in the Health app's "State of Mind" as well (iOS 18 and later)
  • This write happens only when you turn the sync on in settings. It's off by default, and nothing is written
  • Write permission is shown in the same upfront list as read permissions (so we never ask out of the blue later)
  • The Regulation Score itself is never written back to the Health app

What Feelmo does not do

  • We do not use HealthKit data for advertising or marketing
  • We do not provide or sell HealthKit data to any third party, including data brokers (we comply with Apple's guidelines)
  • We do not perform medical diagnosis or personal profiling with the data

Checking & changing permissions

You can check or change HealthKit permissions any time from iOS Settings.

Settings → Privacy & Security → Health → Feelmo

There you can toggle read access for each data type, such as heart rate variability and sleep. No permission is needed for features you don't use.

We show everything upfront

Feelmo discloses every item it may use at first onboarding and asks for them all at once — so you're never asked out of the blue later. If you decline an item, everything except the related feature keeps working as is.

Where the data lives

The Regulation Score, emotion logs, and behavior logs computed from the data read via HealthKit are kept on your device only, as a rule, and are not sent to our servers automatically. See Data & Privacy and Apple Watch & HealthKit for more.

Not a medical device

Feelmo is not a medical device and is not intended for diagnosis or treatment. For any concerning symptom, please consult a medical professional.

Last updated: 6/11/26, 1:07 AM
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