Privacy Policy

Effective Date: February 27, 2026 — Last Updated: May 31, 2026

BellSense (“we,” “our,” or “us”) operates the BellSense mobile application (the “App”). This Privacy Policy explains how we collect, use, store, and safeguard your information when you use the App.

We may update this policy periodically. Continued use of the App after changes are posted constitutes your acceptance of the updated policy.

1. Overview

This Privacy Policy describes how BellSense collects, uses, and protects your data in connection with the use of the App and related hardware.

2. Information We Collect

A. Account Information

Name
Email address
Login credentials

B. Workout & Sensor Data

Repetition counts
Exercise type
Session duration and timestamps
Performance metrics derived from motion sensor (IMU) data
Heart rate data when a compatible Bluetooth heart rate monitor is connected

If you enable the optional “Contribute Training Data” setting, a raw binary recording of sensor readings may be uploaded to our secure cloud infrastructure. This feature is off by default and entirely opt-in.

C. User Feedback & Readiness Check-In Data

Subjective workout feel ratings (1–5 scale)
Daily readiness check-in inputs you provide — such as overall readiness, energy, soreness, and sleep quality
Free-text notes
Manual rep count corrections

D. Health Data (Apple Health / HealthKit)

If you choose to connect Apple Health, BellSense reads the following metrics, with your permission, to calculate your daily readiness score:

Heart rate variability (HRV)
Resting heart rate
Sleep duration

Connecting Apple Health is optional. You grant access through Apple’s standard Health permission prompt, and you can review or revoke it at any time in iOS Settings → Privacy & Security → Health → BellSense. The App only reads these metrics — it never writes data back to Apple Health.

Your raw Apple Health data (HRV, resting heart rate, and sleep duration) is processed only on your device and is never uploaded to our servers or stored in our cloud. To sync your readiness history across your devices, we store only the resulting readiness score and its component sub-scores (normalized values that do not contain your raw Apple Health measurements).

We do not use Apple Health data for advertising or marketing, we do not sell it, and we do not share it with third parties. Apple Health data is used solely to provide the readiness and recovery features within the App, consistent with Apple’s HealthKit requirements.

E. Device & Diagnostic Data

Device model
iOS version
App version
Crash reports
Performance logs

F. Analytics Data

Usage behavior
Feature interaction
Aggregated analytics via Firebase

3. Services Used

BellSense uses Google Firebase for authentication, cloud data storage, file storage, analytics, and crash reporting. This includes Firebase Authentication, Firestore, Firebase Storage, and Crashlytics. Data may be processed on secure cloud infrastructure operated by Google.

4. How We Use Information

Provide workout tracking functionality
Generate performance analytics
Sync workout history across devices
Improve rep detection and fatigue prediction accuracy
Build personalized movement baselines
Calculate your daily readiness and recovery score from your check-in inputs and, if connected, Apple Health metrics
Debug crashes and improve stability
Communicate product updates
Respond to support inquiries

Session performance data (including rep metrics, velocity trends, fatigue patterns, subjective feel ratings, and readiness sub-scores) may be used in aggregate and anonymized form to train and improve machine learning models that power in-app features. This data is processed under your account and is not shared with third parties for marketing purposes. Your raw Apple Health data is excluded from this processing — it never leaves your device.

Your readiness score is provided for general training and wellness guidance only. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any health condition.

5. Optional Training Data Contribution

You may opt in to contribute anonymized sensor data to help improve exercise detection accuracy. This feature is disabled by default and can be enabled via Settings → Personal Info → Contribute Training Data.

Uploaded recordings contain motion sensor data only — no audio, video, location, or personal identifiers. Files are stored under your account ID and are not shared with third parties.

Disabling the toggle stops all future captures immediately. To request early deletion of uploaded sensor files, contact support@bellsense.app.

6. Data Storage

Workout and account data are stored locally on your device and in secure cloud infrastructure. Reasonable administrative, technical, and physical safeguards are implemented to protect your data.

Raw Apple Health data is an exception: it is stored only on your device and is never uploaded to our cloud. Only your derived readiness score and its normalized sub-scores are synced.

7. Data Sharing

We do not sell personal information. Data may be shared with service providers strictly for hosting, analytics, or infrastructure support, or if required by law.

8. Data Retention & Deletion

We retain data only as long as necessary to provide services.

Users may delete their account and all associated data — including readiness history and derived readiness scores — at any time via Settings → Delete Account, or by contacting support@bellsense.app.

To stop BellSense from reading Apple Health data, revoke access in iOS Settings → Privacy & Security → Health → BellSense; your raw Apple Health data remains on your device under Apple’s control.

9. Beta Testing

During beta testing via TestFlight, Apple may provide crash logs and limited diagnostic information. This section will be removed upon full App Store release.

10. Children's Privacy

BellSense is not intended for individuals under 13 years of age. We do not knowingly collect data from children.

11. Contact

For privacy-related inquiries: support@bellsense.app