BlokDust might be a bit more popular than watchOS. We know about 1 link to it since March 2021 and only 1 link to watchOS. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
You can find the list of compatible watches all the way at the bottom of this page: apple.com/watchos/watchos-7 (it's right above the SDK section) Hope that helps clear up your confusion! Source: about 3 years ago
u can make something online pretty easy. Beepbox makes melodies. You can make drum beats with this thing. I love this program for texture and noise called blokdust. And obxd is super fun to play around with. Source: about 3 years ago
InfiniTime - InfiniTime is an open-source, C++-based firmware OS specifically made for the PineTime smartwatch.
Sampulator - Make (and record) beats on your keyboard
wasp-os - Firmware for smart watches based on the nRF52 family of microcontrollers (including Pine64 PineTime)
Splice Beat Maker - Make and share beats in your browser
InfiniLink - iOS Companion App for InfiniTime and the PineTime smartwatch
Ramsophone - A generative art/music machine. (Be sure to refresh!)