# seemoo-lab/openhaystack

Build your own 'AirTags' 🏷 today! Framework for tracking personal Bluetooth devices via Apple's massive Find My network.

Repository: https://github.com/seemoo-lab/openhaystack
Canonical: https://ross.abutalabs.com/products/openhaystack
Homepage: https://owlink.org
Language: Swift
License: AGPL-3.0
License Family: copyleft
Topics: apple, offline-finding, bluetooth, microbit, location-tracker, macos, find-my, airtag, reverse-engineering
Last push: 2026-08-17T12:23:59+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 8, longevity 100
- inputs: {"age_days": 2018, "days_push": 16, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 13467, forks 677 (observed 2026-08-28T04:11:03.370146+00:00)

## What it is
OpenHaystack is a framework and macOS application for creating custom Bluetooth tracking tags that leverage Apple's Find My (offline finding) network to report their location. It was built from a security analysis of Apple's Find My protocol and includes firmware for micro:bit and other BLE devices.

## Use cases
- build my own airtag-like tracker
- track my keys or backpack with bluetooth
- integrate find my tracking into a custom device
- reverse engineer apple's find my network
- locate lost items without cellular coverage
- flash openhaystack firmware onto a micro:bit

## When to choose
- you want an open-source, self-built alternative to AirTags using Apple's Find My network
- you're researching or learning how offline finding and BLE advertising work
- you want to embed tracking into your own Bluetooth-capable hardware

## When to avoid
- you need a polished, production-ready tracker with anti-stalking protections
- you don't own a Mac, since the companion app is macOS-only
- you need rotating keys or complete firmware robustness, as the code is experimental and broadcasts a fixed public key

## Facets
- artifact type: framework
- maturity: experimental
- function: security, cryptography, reverse-engineering
- domain: security, privacy, hardware, apple-ecosystem, reverse-engineering
- platform: embedded
- tags: find-my, airtag, bluetooth-tracking, location-tracker, offline-finding, microbit, ble-beacon, bluetooth, macos, swift

## Member repositories
- seemoo-lab/openhaystack (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:03.370146+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:13:17.025290+00:00, confidence not recorded.
  - readme: https://github.com/seemoo-lab/openhaystack (fetched 2026-08-28T04:11:03.370146+00:00, sha 79f2d28e0fe8)
  - homepage: https://owlink.org (fetched 2026-08-29T08:08:09.895622+00:00, sha 7ce454d82c77)
  - site_page: https://owlink.org/about (fetched 2026-08-29T08:08:09.905091+00:00, sha cc586a2e5aab)
- Data as of 2026-08-30T08:39:29.467469+00:00.