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Attribution

Strand is an independent, unofficial, local-first macOS app. It is not affiliated with, endorsed by, or connected to WHOOP, Inc. "WHOOP" is used nominatively only to identify the hardware the app interoperates with.

Strand builds on prior open-source reverse-engineering and interoperability work:

WHOOP 4.0 protocol + Swift packages

  • johnmiddleton12/my-whoop — the WhoopProtocol and WhoopStore Swift packages (vendored under Packages/), the WHOOP 4.0 BLE framing/command/decode work, and the iOS collection logic that Strand's WhoopBLE/Collect layers are adapted from. See DISCLAIMER.md (carried over from that project).

WHOOP 5.0 / MG protocol

  • b-nnett/goose — the WHOOP 5.0 BLE reverse-engineering (service UUID family fd4b0001-…, CRC16-Modbus header, CLIENT_HELLO, and the "puffin" packet types) that Strand's DeviceFamily Whoop-5 path and whoop5_protocol.json are ported from.

Other

  • GRDB.swift (groue/GRDB.swift) — SQLite persistence (via Swift Package Manager).

Strand contains no WHOOP proprietary code, binaries, firmware, logos, or assets, and performs no DRM circumvention. It operates only with the user's own device and data. Strand is not a medical device; all metrics (HR, HRV, recovery, strain, sleep, SpO₂, temperature) are approximations and not clinically validated.