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co.build lists third-party projects and provides its own descriptions and setup prompts. Review instructions before running them: device changes can cause damage, data loss or security problems. Independent repair does not automatically remove statutory warranty rights, but damage caused by a modification may be excluded where law permits. Check the project, permissions and local law. Device names and logos belong to their owners; a listing does not imply their endorsement.

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Devices Mods Requests Submit a project

1
InfiniTime
Run community firmware on your PineTime
2
NOOP
Replaces the WHOOP app, with your old history brought over
3
Garmin Grafana
Chart your health and workouts on your own server

4
GarminDB
Keep Garmin health history in a local database
Garmin watches
Garmin watches
5
Open Wearables
WHOOP and your other wearables, on your own server
WHOOP
WHOOP

6

Garmin Forerunner 265 in black

Garmin MCP

Ask about training and manage Garmin workouts

Garmin watches

Garmin watches

7

OpenStrap Edge

Recovery and sleep scores, synced to your phone's health app

WHOOP

WHOOP

8

openScale

Keep scale readings on your Android phone

Bluetooth bathroom scales

Bluetooth bathroom scales

9

Dexcom G7 glucose sensor on its adhesive patch

Nightscout

Host a glucose dashboard for your own readings

Dexcom glucose sensors

Dexcom glucose sensors

10

White Pebble 2 Duo watch with the complete case, buckle and strap

PebbleOS

Build and load your own watch firmware

Pebble watches

Pebble watches

11

Editorial product render of a black Bangle.js 2 smartwatch with its strap buckled into a loop

Espruino firmware

Run JavaScript on supported microcontrollers and watches

Bangle.js

Bangle.js

12

BrainFlow

Record and analyze biosensor signals in your own software

Muse headbands

Muse headbands

13

Garmin Forerunner 265 in black

Garmin Connect for Home Assistant

Turn Garmin health readings into home automations

Garmin watches

Garmin watches

14

Wasp-OS

Write and upload Python apps to your watch

PineTime

PineTime

15

Black Eight Sleep Pod 6 hub beside its folded quilted cover

Free Sleep

Run the Pod with local schedules and a web app

Eight Sleep Pod

Eight Sleep Pod

16

Editorial product render of a black Bangle.js 2 smartwatch with its strap buckled into a loop

Bangle.js App Loader

Choose apps, maps and data tools for your Bangle.js

Bangle.js

Bangle.js

17

Graphite Muse 2 EEG headband with gold sensor contacts

Muse LSL

Record Muse signals as local CSV files

Muse headbands

Muse headbands

18

LilyGO T-Watch 2020 V3

My-TTGO-Watch

Add apps to your T-Watch or original Core2 display

LilyGO T-Watch

LilyGO T-Watch

19

AsteroidOS

Run a Linux operating system on supported watches

Huawei and Honor wearables

Huawei and Honor wearables

20

Fitbit Charge 6 in black

Grafana Dashboard for Fitbit

Chart your Fitbit history in a database you keep

Fitbit

Fitbit

21

NutriTrace

Show scale readings alongside your food diary

Withings scales

Withings scales

22

Garmin Home Assistant

Control lights, scenes and home devices from your watch

Garmin watches

Garmin watches

23

Auuki

Run structured smart-trainer workouts in your browser

Wahoo KICKR trainers and ELEMNT bike computers

Wahoo KICKR trainers and ELEMNT bike computers

24

Dexcom G7 glucose sensor on its adhesive patch

xDrip4iOS

Use a customizable glucose display on iPhone

Dexcom glucose sensors

Dexcom glucose sensors

25

OpenPelo

Manage apps on your Peloton screen from a computer

Peloton Bike

Peloton Bike

26

KICKR (v6) smart trainer on a white background

wahooMapsCreator

Fresh OpenStreetMap maps on your ELEMNT

Wahoo KICKR trainers and ELEMNT bike computers

Wahoo KICKR trainers and ELEMNT bike computers

27

Espruino Web IDE

Write JavaScript for Espruino devices in your browser

Bangle.js

Bangle.js

28

Oura Ring 4 in silver

open_oura

Raw ring data in your own database

Oura Ring

Oura Ring

29

HassControl

Control Home Assistant groups from your watch

Garmin watches

Garmin watches

30

COROS PACE 3 watch with an Ink nylon band

CorosLink

Manage COROS training and media from your desktop

COROS watches

COROS watches

31

Black Eight Sleep Pod 6 hub beside its folded quilted cover

Eight Sleep for Home Assistant

Control the Pod from Home Assistant

Eight Sleep Pod

Eight Sleep Pod

32

hevy2garmin

Bring Hevy strength workouts into Garmin

Garmin watches

Garmin watches

33

PineTime smartwatch with complete strap

InfiniLink

Manage PineTime from your iPhone

PineTime

PineTime

34

Black Peloton Bike with red flywheel accents and an attached workout screen

SmartSpin2k

Add a physical resistance controller to your bike

Peloton Bike

Peloton Bike

35

ZeppBridge

Explore Zepp records on your own computer

Amazfit watches and bands

Amazfit watches and bands

36

White FreeStyle Libre 3 Plus glucose sensor

Juggluco

Read supported glucose sensors locally on Android

FreeStyle Libre

FreeStyle Libre

37

WHOOP 5.0/MG with a black SuperKnit Luxe band and gold clasp.

WHOOP MCP

Ask Claude, Codex or Cursor about your recovery

WHOOP

WHOOP

38

Mi Create

Build a watchface around the readings you want

Xiaomi Smart Band

Xiaomi Smart Band

39

Oral-B iO Series 6 toothbrush

Home Assistant Oral-B

Record brushing events in your smart home

Oral-B toothbrushes

Oral-B toothbrushes

40

Black Peloton Bike with red flywheel accents and an attached workout screen

Peloton for Home Assistant

Turn your workout into a home automation trigger

Peloton Bike

Peloton Bike

41

Xiaomi Mi Body Composition Scale 2, one of the supported Bluetooth scales

BLE Scale Sync

Log scale readings locally and send them to your apps

Bluetooth bathroom scales

Bluetooth bathroom scales

42

Garmin Forerunner 265 in black

garmin-givemydata

Archive your Garmin history in a local database

Garmin watches

Garmin watches

43

GlucoDataHandler

Send glucose readings to more Android displays

Dexcom glucose sensors

Dexcom glucose sensors

44

HUAWEI WATCH GT 7 Pro with a yellow strap

Hitrava

Move Huawei Health workouts into Strava

Huawei and Honor wearables

Huawei and Honor wearables

45

Apple Watch Series 12 in dark bronze with an olive band

openGym

Log strength workouts from your wrist

Apple Watch

Apple Watch

46

SparkyFitness

Keep fitness charts beside your food and workout diary

Fitbit

Fitbit

47

Oura Ring for Home Assistant

Use sleep and readiness in your home automations

Oura Ring

Oura Ring

48

ResMed AirSense 11 CPAP machine with humidifier, angled view on a plain background

ResMed myAir for Home Assistant

myAir's nightly figures as Home Assistant sensors

ResMed AirSense CPAP machines

ResMed AirSense CPAP machines

49

White Pebble 2 Duo watch with the complete case, buckle and strap

Home Assistant WS

Control your home and read its sensors from your wrist

Pebble watches

Pebble watches

50

Dexcom G7 glucose sensor on its adhesive patch

Nightscout Clock

Put glucose readings on a bedside clock

Dexcom glucose sensors

Dexcom glucose sensors

51

Legacy Tacx Bushido T1980 trainer with handlebar computer and wheel support

FortiusANT

Connect an older Tacx trainer to current riding apps

Tacx legacy trainers

Tacx legacy trainers

52

OMRON Bluetooth blood pressure monitors hardware

Blood Pressure Monitor

Chart and export readings from selected Omron monitors

OMRON Bluetooth blood pressure monitors

OMRON Bluetooth blood pressure monitors

53

OMRON Bluetooth blood pressure monitors hardware

hass-omron (Omron BLE)

Blood pressure readings in Home Assistant

OMRON Bluetooth blood pressure monitors

OMRON Bluetooth blood pressure monitors

54

Editorial product render of a black Bangle.js 2 smartwatch with its strap buckled into a loop

Espruino CLI

Upload scripts and files to Espruino devices

Bangle.js

Bangle.js

55

WHOOP 5.0/MG with a black SuperKnit Luxe band and gold clasp.

Totem

Let your AI log activities and journal entries

WHOOP

WHOOP

56

Garmin Forerunner 265 in black

garmin-health-data

Archive health readings with control over storage

Garmin watches

Garmin watches

57

Schwinn IC4 indoor cycling bike

Gymnasticon

Send bike power and cadence to training apps

Schwinn IC4 and Bowflex C6

Schwinn IC4 and Bowflex C6

58

COROS PACE 3 watch with an Ink nylon band

COROS MCP

Ask an AI about your training and sleep

COROS watches

COROS watches

59

Garmin Forerunner 265 in black

running_page

Build a personal map of your runs

Garmin watches

Garmin watches

60

microPebble

Use a lightweight Android companion for Pebble

Pebble watches

Pebble watches

61

WaterRower Original Oak rowing machine

PiRowFlo

Send WaterRower readings to training apps

Rowing machines

Rowing machines

62

Complications Suite

Add data and shortcuts to existing watch faces

Samsung Galaxy Watch

Samsung Galaxy Watch

63

OpenHRV

See live HRV and record paced-breathing sessions

Polar heart-rate sensors

Polar heart-rate sensors

64

Graphite Muse 2 EEG headband with gold sensor contacts

BlueMuse

Stream Muse signals into Windows research tools

Muse headbands

Muse headbands

65

Amazfish

Use a local companion on your Linux phone

Garmin watches

Garmin watches

66

Fitbit Charge 6 in black

Google Health for Home Assistant

Use Fitbit readings in home automations

Fitbit

Fitbit

67

Black Eight Sleep Pod 6 hub beside its folded quilted cover

eightctl

Export sleep data and script Pod controls

Eight Sleep Pod

Eight Sleep Pod

68

OpenFit

View and export Fitbit data in a desktop app

Fitbit

Fitbit

69

Subsurface

Keep and compare dive logs on your computer

Garmin watches

Garmin watches

70

FIT File Faker

Edit and import rides from other training tools

Garmin watches

Garmin watches

71

Polar Vantage M3 in Sand with gold bezel

Polar USB tools

Download your Polar watch's files over USB

Polar watches

Polar watches

72

Black Peloton Bike with red flywheel accents and an attached workout screen

Grupetto

Broadcast Peloton metrics to other training apps

Peloton Bike

Peloton Bike

73

AsteroidOS Sync

Sync notifications with a watch running AsteroidOS

Huawei and Honor wearables

Huawei and Honor wearables

74

Endurain

Host your activity and health dashboard yourself

Garmin watches

Garmin watches

75

Pulse

Run your own recovery and sleep dashboard

Fitbit

Fitbit

76

Fitbit Charge 6 in black

Google Health CLI

Export Fitbit readings from your terminal

Fitbit

Fitbit

77

Fitbit Charge 6 in black

Google Health MCP

Ask your AI assistant about Fitbit data

Fitbit

Fitbit

78

OpenCircuit

Read your ring locally and sync it to Apple Health

RingConn

RingConn

79

Apple Watch Series 12 in dark bronze with an olive band

ESPresense

Use ESP32 boards for room presence

Apple Watch

Apple Watch

80

NeuroSkill

Explore and compare Muse EEG sessions on your desktop

Muse headbands

Muse headbands

81

Garmin Forerunner 265 in black

GoldenCheetah

Analyze training and power without a cloud account

Garmin watches

Garmin watches

82

Home Assistant Companion

Control your home from an iPhone or Apple Watch

Apple Watch

Apple Watch

83

Dreeve

Keep workouts in your own training dashboard

Polar watches

Polar watches

84

Xiaomi Mi Body Composition Scale 2, one of the supported Bluetooth scales

RENPHO Fitness Scale BLE

Send live weigh-ins to Home Assistant

Bluetooth bathroom scales

Bluetooth bathroom scales

85

Essentials for Wear OS

Control phone settings and see its calendar

Samsung Galaxy Watch

Samsung Galaxy Watch

86

HMS-CPAP (CpapDash)

Your nights in a local web dashboard

ResMed AirSense CPAP machines

ResMed AirSense CPAP machines

87

Hammerhead Karoo cycling computer on a transparent background

Karoo Headwind

See wind and weather along your ride

Hammerhead Karoo

Hammerhead Karoo

88

White Pebble 2 Duo watch with the complete case, buckle and strap

Pebble SDK

Build and install your own Pebble apps

Pebble watches

Pebble watches

89

Garmin Forerunner 265 in black

Smart Bike Lights

Set your own rules for ANT+ bike lights

Garmin watches

Garmin watches

90

PineTime smartwatch with complete strap

eucWatch

Read electric-unicycle data on your wrist

PineTime

PineTime

91

Garmin Forerunner 265 in black

Barcode Wallet

Show loyalty cards and tickets on your watch

Garmin watches

Garmin watches