# OpenStrap research: reconstructing WHOOP 4.0 BLE data access

> OpenStrap research reconstructs WHOOP 4.0 BLE framing, history synchronization and sensor-record decoding. Its Python research client can scan and connect to a band, stream heart rate and motion, drain history, decode frames and replay saved captures.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-08
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/OpenStrap/research>
- Primary source: <https://github.com/OpenStrap/research/blob/c6be09c4021546e4693dcf74da25d7b793ff8a40/README.md>
- Catalog page: <https://awesomerea.org/resources/openstrap-whoop4-research-case/>
- Record JSON: <https://awesomerea.org/resources/openstrap-whoop4-research-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/openstrap-whoop4-research-case/index.md)

## Requirements & limits

- **Prerequisites:** A WHOOP 4.0 band and bleak for live Bluetooth operations.
- **Limits:** Most fields beyond the 1 Hz record header remain empirical or unknown.
- **License:** MIT License.

## Primary sources

1. <https://github.com/OpenStrap/research/blob/c6be09c4021546e4693dcf74da25d7b793ff8a40/README.md>
2. <https://github.com/OpenStrap/research/blob/c6be09c4021546e4693dcf74da25d7b793ff8a40/PROTOCOL.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.