NOOP: An Offline, Account-Free Companion App for WHOOP Straps

NOOP is an independent, unofficial, and fully offline companion app designed for WHOOP straps (versions 4.0 and 5.0) and experimental Oura Ring integration. Built to operate entirely without a cloud server, user account, or subscription, NOOP pairs directly with user-owned hardware via Bluetooth and stores all biometric data locally in a SQLite database.

Core Architecture and Privacy

• No Cloud or Accounts: The application requires no login or connection to external servers, ensuring that heart rate, R-R intervals, SpO₂ and other health metrics never leave the user's device.
• Transparent Local Analytics: Recovery, strain, HRV, and sleep stages are computed directly on-device using documented, citable methods such as Karvonen %HRR and Task Force 1996 HRV. These algorithms serve as approximations rather than direct reproductions of proprietary models.
• Data Portability: Users can import historical data via WHOOP CSV exports or Apple Health export XML files to build a permanent local archive.

Platform Features and Integration

• Cross-Platform Design: Shipped with a shared cross-platform codebase supporting macOS, iOS, and Android devices under the "Liquid Metal" design language.
• Automation and Shortcuts: On macOS, strap interactions such as double-taps can trigger local system actions or execute custom macOS Shortcuts via URL schemes.
• Hardware Limitations: The software is constrained by what sensors can physically decode. For instance, WHOOP 5.0 / MG requires breaking the official app's Bluetooth bond for pairing, and certain advanced metrics remain dependent on raw sensor inputs.

Licensing and Verification

NOOP is source-available under the PolyForm Noncommercial License 1.0.0, making it free for personal and educational use while restricting commercial application. It is explicitly not a medical device, and derived metrics are intended for informational purposes only. Users can inspect the full source code and verify installation steps directly through the project's official GitHub repository at ryanbr/noop.