Do I need a wearable?

No. Wearables help but are optional. The 12-minute check plus phase-aware baselines are enough to produce a daily call.

What's in the 12-minute check?

Seated→standing HRV (if available), single-leg balance, 30-second finger taps (both hands), 5× sit-to-stand, soreness, readiness.

What do coaches receive?

A morning list with Push/Steady/Recover per athlete and a weekly 1-pager. No dashboards.

Wellness-only. Private by default. We share today's call and weekly aggregates with staff. Athletes can withdraw anytime.

What's 'phase-aware'?

We compare each athlete to her rolling, phase-aware baseline to avoid late-luteal false 'under-recovered' flags common in generic algorithms.

Privacy Policy

Last Updated: November 1, 2025

Your Privacy Matters

PhaseTwin ("we," "us," "our") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, share, and protect your information.

IMPORTANT: PhaseTwin is a wellness app and is NOT covered by HIPAA (Health Insurance Portability and Accountability Act). We are not a healthcare provider, health plan, or healthcare clearinghouse.

1. Information We Collect

Account Information

Name, email address, phone number
Team affiliation (coach, sport)
School/institution
Account credentials (hashed passwords)

Wellness & Performance Data

Daily check-in responses (balance tests, reaction time, sit-to-stand performance)
Biometric data you choose to share (heart rate, HRV, respiratory rate, temperature, sleep duration)
Menstrual cycle data (last menstrual period, cycle phase estimates)
Self-reported soreness and readiness levels
Training calls (Push/Steady/Recover recommendations)

Usage Data

Login times, pages visited, features used
Device information (browser type, operating system)
IP address and general location data
AI chatbot conversations (with Luna and Dr. Audri)

Communications

Feedback, bug reports, and support requests
Pilot application information

2. How We Use Your Information

We use your data to:

Provide the Service: Generate daily training recommendations, track readiness, display coach dashboards
Improve the Service: Analyze usage patterns, fix bugs, develop new features
AI Assistance: Power Luna and Dr. Audri chatbots (your conversations are sent to OpenAI's API)
Communicate: Send updates about the pilot program, respond to inquiries
Research: Analyze anonymized data to improve cycle-aware training algorithms (only with your explicit consent)
Legal Compliance: Comply with applicable laws and legal requests

3. How We Share Your Information

With Your Coach

If you are an athlete, your coach has access to:

Your daily training calls (Push/Steady/Recover)
General readiness trends and patterns
Aggregated team data

Coaches do NOT have access to: Your raw biometric data, specific menstrual cycle dates, or private AI chat conversations.

With Third-Party Services

OpenAI: Your AI chat messages are sent to OpenAI's API to generate responses. OpenAI's privacy policy applies: openai.com/privacy
Hosting Services: Data is stored on Replit's secure infrastructure

We Do NOT Sell Your Data

We do not sell, rent, or trade your personal information to third parties for marketing purposes.

Legal Disclosures

We may disclose information if required by law, court order, or to protect rights and safety.

4. AI & OpenAI Data Processing

PhaseTwin uses OpenAI's GPT-4 to power Luna and Dr. Audri chatbots.

What this means:

Your chat messages are sent to OpenAI's servers to generate AI responses
OpenAI may temporarily process your messages but does not use them to train public models (per their data usage policy as of 2025)
Do not share sensitive personal health information in AI chats
AI responses are not stored permanently but may be logged for debugging during the pilot

Learn more: OpenAI Enterprise Privacy

5. Data Security

We implement security measures to protect your data:

Encryption: Data is encrypted in transit (HTTPS/TLS)
Password Protection: Passwords are hashed using industry-standard methods
Access Controls: Limited team access to production data
Secure Hosting: Data stored on Replit's secure infrastructure

However, no system is 100% secure. While we take reasonable precautions, we cannot guarantee absolute security.

6. Data Retention

Active Accounts: Data retained as long as your account is active
Pilot Program: Data collected during the 4-week pilot may be retained for analysis with your consent
Deletion Requests: You may request data deletion at any time (see Your Rights below)
Backups: Backup copies may persist for up to 90 days after deletion

7. Your Privacy Rights

You have the right to:

Access: Request a copy of your personal data
Correction: Update or correct inaccurate information
Deletion: Request deletion of your account and data
Data Portability: Receive your data in a machine-readable format
Opt-Out: Decline participation in research or data analysis
Withdraw Consent: Withdraw consent for data processing at any time

To exercise these rights, contact: tavar24a@mtholyoke.edu

8. Children's Privacy

PhaseTwin is intended for users 18 years and older. We do not knowingly collect data from children under 13. If you are 13-17, you may use the Service only with parental consent.

9. Cookies & Tracking

We use session cookies to:

Keep you logged in
Remember your preferences
Protect against CSRF attacks

We do not use third-party advertising cookies or trackers during the pilot phase.

10. Changes to This Policy

We may update this Privacy Policy. Continued use of the Service after changes constitutes acceptance. We will notify you of material changes via email or in-app notice.

11. Contact Us

Questions about privacy? Contact:

Adriana N. Tavarez
Mount Holyoke College
Email: tavar24a@mtholyoke.edu
Phone: +1 (914) 648-5926

By using PhaseTwin, you consent to the collection and use of information as described in this Privacy Policy.