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{{Tool Infobox|Related topics=Heart rate, Location tracking, Activity tracking}}

{{Tool Infobox|Related topics=Heart rate, Location tracking, Activity tracking}}

The '''Bangle.js''' is the name of a series of open source smartwatches that are made by [[Espruino]] under the leadership by Gordon Williams, who also designed the [[Puck.js]] open source hardware that can be used as a [[One Button Tracker]].   

The '''Bangle.js''' is the name of a series of [[Open Source Device|open source]] smartwatches that are made by [[Espruino]] under the leadership by Gordon Williams, who also designed the [[Puck.js]] open source hardware that can be used as a [[One Button Tracker]].   

A unique feature of the Bangle.js watches is that users can program their own apps for the devices in the JavaScript programming language and can deploy them on their own watch without having to go through any closed app store model. Furthermore, as the Bluetooth connection for the devices work through web-browser based connections, they all happen client-side, so no data is send to third parties.   

A unique feature of the Bangle.js watches is that users can program their own apps for the devices in the JavaScript programming language and can deploy them on their own watch without having to go through any closed app store model. Furthermore, as the Bluetooth connection for the devices work through web-browser based connections, they all happen client-side, so no data is send to third parties.