# CustomWatch: a Prixton Life Fit companion from BLE protocol research

> CustomWatch implements an Android companion for the Prixton Life Fit smartwatch using a BLE protocol studied through static analysis, limited capture and one-device tests. It requests activity, pulse and battery data, stores sleep observations locally, and forwards selected notifications.

- Type: Case study
- Targets: Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/kta41/CustomWatch>
- Primary source: <https://github.com/kta41/CustomWatch/blob/206f30486d04bc21f97fd17b059c8d98811e3085/README.md>
- Catalog page: <https://awesomerea.org/resources/customwatch-case/>
- Record JSON: <https://awesomerea.org/resources/customwatch-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/customwatch-case/index.md)

## Requirements & limits

- **Prerequisites:** Android 8.0 or newer and a compatible Prixton Life Fit watch.
- **Prerequisites:** Building requires JDK 17 or newer, Android SDK 35 and Gradle 8.9.
- **Limits:** The author tested one watch; firmware compatibility and several health interpretations remain uncertain.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/kta41/CustomWatch/blob/206f30486d04bc21f97fd17b059c8d98811e3085/README.md>
2. <https://github.com/kta41/CustomWatch/blob/206f30486d04bc21f97fd17b059c8d98811e3085/TECHNICAL_REFERENCE.es.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.