Last Updated: February 22, 2026

At Onyx ("we," "us," or "our"), we prioritize your privacy and are committed to protecting your personal health data.

This Privacy Policy explains how we collect, use, and safeguard your information when you use the Onyx iOS application (the "App").

1. Data Collection and HealthKit

Onyx integrates with Apple's HealthKit to provide personalized fitness, recovery, and longevity insights.

We request access to the following HealthKit data types:

• Read Access: Heart Rate, Resting Heart Rate, Heart Rate Variability (HRV), Sleep Analysis, Step Count, Active Energy Burned, Exercise Time, VO2 Max, Respiratory Rate, Blood Oxygen (SpO2), Body Temperature, and Body Metrics.
• Write Access: Workouts, Dietary Energy, Water (Hydration), and Macronutrients (Protein, Carbs, Fats).
• AI Data Processing (Third-Party Services):
  • To provide advanced intelligence features, Onyx utilizes third-party AI services. We only share data with these services if you have provided explicit consent within the App.
• AI Performance Coaching: When you use AI-powered features (like "AI Coach" or "Intelligence Reports"), anonymized biometric trends (e.g., HRV, Sleep duration) are processed to generate personalized insights. These insights are generated using Anthropic (Claude 3.5).
• AI Nutrition Analysis: When you use AI-powered features (like "AI Log" or "Food Scanner"), your input text and scanned images are transmitted to OpenAI (GPT-4o) for processing.
• Identity Protection: We do not send personal identifying information (PII) such as your name, email, or account identifiers to these services. Data is anonymized and used only for transient analysis.

2. How We Use Your Data

We use your data to:

• Calculate your Daily Readiness and Recovery Score (Processed locally on-device).
• Provide scientific benchmarks by comparing your metrics against peer-reviewed health standards (Processed locally on-device).
• Correlate nutritional habits with recovery (Metabolic Feedback) (Processed locally on-device).

Onyx uses a 100% On-Device privacy model for all raw HealthKit data. No raw vitals, heart rates, or sleep patterns are ever transmitted to external AI services. Only processed, anonymized trends are shared with third-party AI providers (OpenAI and Anthropic) to generate personalized coaching. These third parties are contractually bound to provide equal or higher protection for any data they process on our behalf. We do not use your HealthKit data for advertising, marketing, or use-based data mining.