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You can run Espruino on both of those. I just flashed the Watchy the other day and it works while plugged in (just drains the battery quickly). Pinetime is running an NRF52832 so it runs Espruino as well, but I think you have to open the case to get to the SWD pins (the default bootloader is not compatible with Espruino OTA update).
yngv126399
Thats my thought as well. I have a watchy watch and a pine time watch. Both have a OS that is compiled with all the apps. So it a pain to work with. Espruino seems like the best thing for this.