Health App Data

This page explains the main data Feelmo exchanges with Apple's Health app (HealthKit), why it requests access, and where app records are stored. Detailed proprietary processing and display rules for Balance and other product displays are not public.

Feelmo does not infer emotion or directly measure autonomic state. Balance uses proprietary on-device processing to summarize HRV-derived information available through Apple Watch / HealthKit and patterns in your own past. Other permitted data support their corresponding cards or optional features. This page explains what the app may read or write and why; proprietary processing details remain unpublished.

What is HealthKit

HealthKit is the mechanism that gathers and stores the health data measured by your Apple Watch and iPhone all in one place, inside iOS's Health app. Heart rate variability, heart rate, sleep, step count, and more all collect first into HealthKit.

Feelmo does not perform these body measurements with its own sensor. It reads compatible records in HealthKit only within the permissions you grant. Permissions are separated by data type and can be changed later.

Data Feelmo Reads

During onboarding, Feelmo explains and requests the basic HealthKit items needed to calculate your Balance. If you later turn on an optional feature, it may ask separately for the additional item that feature needs, after explaining why. You choose permissions by data type and can revoke them anytime.

Data	What it's for
Heart rate variability (HRV)	For HRV views and proprietary product displays such as Balance. Exactly which available records contribute and how is not public
Heart rate & heart-rate recovery	For supported heart-rate and workout-related cards. Heart-rate recovery is a context-dependent wearable estimate, not a direct measure of fatigue or completed recovery
Sleep	For supported sleep views. Consumer sleep estimates have measurement error and are not equivalent to a clinical sleep study
Wrist temperature, respiratory rate, blood oxygen (SpO₂) (where supported)	For the Vital Signs card that shows your daily signs (not a diagnosis)
Steps & exercise	For supported activity logs and observational habit-association displays. These displays do not establish causal effects
Time in Daylight (where supported)	For supported daylight and wellbeing records and observational habit-association displays. These displays do not establish causal effects
Mindfulness minutes	To bring mindfulness (meditation / breathing) minutes already recorded in Health into supported records and optional reflection displays (also written)
Water & caffeine (Nutrition) (where supported)	So water and caffeine you logged in other apps (e.g. WaterMinder) or by hand in Health are also summed into your Wellbeing "water / caffeine" — read because your own entries alone can't total other sources (also written)

How to understand HRV access

HRV describes variation in the interval between heartbeats. Autonomic regulation contributes to it, but breathing, posture, time, movement, sleep, exercise, medication, illness, and measurement conditions also affect the value. More variability is not always better, and HRV is not a direct measure of overall autonomic balance.

Feelmo can read available HRV records for HRV views and proprietary displays. The six faces are product interface characters, not inferred emotions or separate measurements. Their display rules are not public.

Balance is not a score for comparing yourself with others. It is not a medical normal/abnormal result or a measure of emotion, fatigue, stress, recovery, or health. For more, see Baseline.

Why wrist measurement conditions matter

Apple Watch uses optical wrist sensing, which can be affected by movement, fit, and skin contact. Error and missing data can remain at rest or during sleep, and a wrist record is not equivalent to a clinical ECG. Feelmo's proprietary record-processing rules are not public.

Data Feelmo Writes

Feelmo writes three kinds of records to HealthKit. Each write occurs only after you explicitly save a supported entry or complete the corresponding session.

Data	What it's for
State of Mind (iOS 18 and later)	Saves the mood, emotions, and associations you choose and confirm. Balance, body-derived product characters, and free-text notes are not written
Mindfulness minutes	Breathing sessions you complete are added as Mindful Minutes in the Health app
Water / Caffeine (Nutrition)	Water and caffeine you log by hand in Feelmo are saved as dietaryWater / dietaryCaffeine

• A State of Mind record is written only when you review and explicitly save your entry. Feelmo never writes automatic Balance or body-derived character displays as your self-reported mood
• When you turn optional State of Mind import on (iOS 18 and later, off by default), Feelmo can also read existing State of Mind records from Apple Health into Mood Log. Import and explicitly saving a new entry are separate actions
• Your Balance score itself is never written back to the Health app — it's a value meant only for watching over within Feelmo
• A write permission is requested when you first use the corresponding optional feature, after the app explains what will be written and why

Turn on State of Mind import only if you want Feelmo to read compatible entries already stored in Apple Health. This import setting is separate from the explicit Save action used when you create a new State of Mind entry.

What Feelmo Does NOT Do

• We do not use data obtained from HealthKit for advertising or marketing
• We do not provide or sell HealthKit data to third parties, including data brokers (we comply with Apple's guidelines)
• We do not use the data for medical diagnosis or advertising-based classification
• We do not automatically send HealthKit-derived data or scores to Provider servers. Exports or shares you start, and Apple-side storage or syncing under your settings, are separate paths

Checking & Changing Permissions

You can check and change HealthKit permissions anytime from iOS Settings.

Settings → Privacy & Security → Health → Feelmo

Here you can toggle reading on / off per data type, such as heart rate variability and sleep. There's no need to grant permission for features you don't use.

If you revoke a permission, or have items you haven't granted yet, Feelmo won't suddenly stop. Only the features that use that item become quietly more modest, while the rest keep working as usual. For example, even if you don't grant the daylight data, your Balance score, breathing exercises, and mood logging stay just as they were.

Where the Data Lives

HealthKit-derived Balance records, face labels, optional notes, and activity logs are stored in Feelmo's on-device storage and are not automatically sent to Provider servers. Feelmo's optional iCloud Sync includes only non-health settings, such as notification, appearance, and reminder preferences and an optional display name.

If you explicitly save a State of Mind entry and grant the write permission requested at that time, the selected item can be written to Apple Health. Storage and iCloud syncing inside Apple Health follow your Apple settings. A PDF export or share that you start sends only the content you select to your chosen destination.

You can delete Feelmo's in-app records. Automatic Provider-server transmission, exports or shares you initiate, and Apple-side storage and syncing are separate paths. See Data & Privacy and Apple Watch and HealthKit.