# SitSense Privacy Policy (Updated for ML + Model Training)

Last Updated: [Insert Date]

Your privacy is our top priority. We believe in complete transparency about how your data is collected, used, and protected.

## 1. Overview

SitSense ("we," "us," "our") is committed to protecting your privacy.

This policy explains what data we collect, how we use it, including how we train and improve our AI models, and your rights regarding your information.

By creating an account, using SitSense, or interacting with our services, you acknowledge that you have read and agree to this Privacy Policy.

## 2. What We Collect

We collect the minimum information necessary to provide and improve SitSense.

### A. Posture Metrics (Numerical Only)

We collect only numerical posture metrics, such as angles, offsets, and positional measurements. These include metrics like:

- neck angle
- craniovertebral angle
- trunk angle
- head-forward distance
- head tilt
- shoulder slope
- neck rotation

These metrics come from pose landmarks processed locally in your browser.

No video, images, or raw camera frames are ever stored, transmitted, or seen by our servers.

### B. Account Information

To create and manage your account, we collect:

- Email address
- Password (hashed/encrypted) or OAuth identity
- Basic profile details
- Subscription and billing status

### C. Usage Data (Anonymized)

We may collect anonymized usage statistics such as:

- session duration
- interaction patterns
- general feature usage
- device/browser type

This helps us improve our product and diagnose issues.

## 3. How We Use Your Data

We use your data to:

### A. Provide Posture Analysis

Numerical posture metrics are used to generate:

- real-time posture feedback
- streaks, points, and progress dashboards
- session summaries
- historical trends

### B. Improve SitSense Through Machine Learning

We may use anonymized and aggregated posture metrics to:

- train slouch prediction models
- train presence or performance-related models
- improve scoring accuracy
- personalize posture recommendations
- detect ergonomic patterns across sessions

All data used for model training is fully anonymized and cannot be linked to individual users.

We never use video or images for model training.

### C. Maintain and Improve the Platform

We use posture metrics and usage data to:

- improve product accuracy
- detect bugs or performance issues
- enhance user experience
- develop new features such as predictive posture alerts or presence scoring

### D. Communicate with You

We may send:

- important service updates
- support communications
- onboarding or product education
- optional marketing or newsletters (only if you opt-in)

## 4. Local Processing & Security

### A. Local-First Design

SitSense performs all pose estimation locally in your browser. Only numerical posture metrics are sent to our servers.

### B. Encryption

All data sent to our servers is encrypted in transit using industry-standard security protocols.

### C. Access Controls

We limit access to your account data to essential personnel only.

### D. No Third-Party Sharing

We do not sell, share, or license your personal or posture data to third parties.

## 5. Machine Learning & Analytics

To improve SitSense, we may:

- process anonymized posture sequences
- analyze aggregated trends
- train predictive models
- develop new coaching algorithms

We NEVER use video or images for ML or analytics.

We NEVER train models on identifiable or raw user data.

All training is done on:

- anonymized, aggregated posture metrics
- derived features
- synthetic or randomized variants of metrics

This ensures your data remains private and unidentifiable.

## 6. Data Retention & Deletion

### A. Retention

We keep your data only as long as necessary to:

- provide posture analytics
- maintain longitudinal progress tracking
- meet legal obligations

### B. Your Right to Delete Data

You may request deletion of:

- your account
- all posture data
- all historical sessions
- all stored analytics

Once deleted, your data cannot be recovered.

### C. Exporting Your Data

You may request a copy of your posture history at any time.

## 7. Your Privacy Rights

Depending on your location (e.g., EU, UK, California), you may have rights including:

- Right to access
- Right to deletion
- Right to correction
- Right to restrict processing
- Right to object to automated processing
- Right to data portability

We honor all applicable privacy rights.

Contact us at [support@sitsense.app](mailto:support@sitsense.app) to exercise your rights.

## 8. Children's Privacy

SitSense is not intended for individuals under 13 (or the age required by local law). We do not knowingly collect data from children.

## 9. Changes to This Policy

We may update this Privacy Policy periodically. If changes materially affect your rights, we will notify you by email or through the app.

The latest version will always be available at [sitsense.app/privacy](/content/privacy/index.html).

## 10. Contact Us

If you have questions, concerns, or requests regarding your data:

📧 [support@sitsense.app](mailto:support@sitsense.app)

📍 SitSense HQ (Remote / Distributed)