We now have stock of Bangle.js and are shipping right away!

Bangle.js is an open, hackable smartwatch. 

You can easily install new apps from the web or develop your own using JavaScript or a graphical programming language (Blockly). All you need is a Web Browser (Chrome, Edge or Opera) and you can upload apps or write code to run on your watch wirelessly! Bangle.js is waterproof and AI enabled and comes with bluetooth low energy, GPS, a heart rate monitor, accelerometer and more.

Hardware Specs 

  • IP68 Waterproof: up to 10m underwater
  • Nordic 64MHz nRF52832 ARM Cortex-M4 processor with Bluetooth LE
  • 64kB RAM 512kB on-chip flash, 4MB external flash
  • 1.3 inch 240x240 16 bit LCD display with 2 zone touch
  • GPS/Glonass receiver (UBlox)
  • Heart rate monitor
  • 3 Axis Accelerometer (with Pedometer)
  • 3 Axis Magnetometer
  • Vibration motor
  • 350mAh battery, 1 week standby time
  • 5 x 5 x 1.7 cm case, plastic with stainless steel ring
  • Can be disassembled with just 4 screws

Software Specs

  • Easy to code and debug wirelessly using JavaScript or our graphical editor (based on Blockly)
  • Pre-programmed with the Espruino Open Source JavaScript interpreter 
  • Vast majority of JavaScript ES5 features and many ES6 features including: Regular Expressions, Promises, Arrow Functions, Template Literals
  • 40kB RAM for program memory/variables
  • Bluetooth 4.2 Advertising, Central and Peripheral mode support with built-in Nordic UART service
  • Graphics library with Vector fonts, bimap rotate & scale
  • Tensorflow Lite for Microcontrollers AI
  • Wear-levelled flash filesystem
  • Heatshrink compression
  • Upload functions written in C or ARM Assembler
  • Built-in wireless debugging
  • VT100 Terminal support on LCD
  • Program with Web-based Web Bluetooth IDE or Node.js-based command line tools



Because Bangle.js is entirely open, you can upload the apps we’ve already developed, create your own, or upload apps created by the online community.

Our app store (at banglejs.com/apps) will be entirely free. We’ll never share your data with third parties or make your use of our apps dependent on third party cloud services. So far we’ve created some great apps including games, a compass, map, spirit level, QR code display and heart rate monitor (to name a few) and we have lots more to come.

Inputs 3x Buttons, 2x touch areas, Heart rate, Accelerometer, 3 axis Magnetometer (compass), GPS, Temperature
Outputs 240x240x16 bit colour LCD, Vibration motor
RAM (kB) 64kB
Flash (kB) 512kB on-chip + 4MB External
Clockspeed (MHz) 64

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Bangle.js Smart Watch

  • Brands Espruino
  • Product Code: BANGLEJS
  • Availability: 751
  • £69.96

  • Ex Tax: £58.30

  • 2 or more £66.00
  • 5 or more £62.40
  • 10 or more £61.20

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Tags: Espruino, Bangle.js, BLE, Bluetooth LE