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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@mcdonnelldean
I don't know about emulator or simulator but you could likely just use a Breakout MDBT42Q and pick up a similar screen to get a very good approximation of it.
You would have to likely flash it with the Bangle.js code and I am not sure if flashing the breakout is as simple as usual when swapping board types so YMMV.
@Gordon Sounds like a lab version of the BangleJS kit, spread on a wider board for tinkering could be a nice addition to the shop :D