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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.
@fanoush
There is also nrfConnect https://apps.apple.com/us/app/nrf-connect-for-mobile/id1054362403
On Android my first choice, mainly because it is so universal and can do so much more in addition to handling DFU too.