The CH32V003 has been around for a few years, and there are also now a 002, 004, 006 with more RAM and Flash (up to 8k + 62k), a better 12 bit (vs 10) ADC, and

The CH32V003 has been around for a few years, and there are also now a 002, 004, 006 with more RAM and Flash (up to 8k + 62k), a better 12 bit (vs 10) ADC, and an updated CPU core with multiply (but not divide) erasing the last advantage of Cortex-M0. Also an expanded 2-5V power supply range (up from 3.3-5V) plus of course a bit of margin on both ends. And pretty much the same low low price, though the 006 for example doesn't come in an 8 pin package option. https://www.aliexpress.us/item/1005008347109826.html https://www.aliexpress.us/item/1005008347109826.html There is now also at the same price the CH570D at also the same price, with 16k RAM, 256k flash, USB, and a 2.4 GHz packet radio similar to things like the nRF24L01. I don't think it's available in bulk yet, but a dev board with a couple of extra chips has been available since early this year: https://www.aliexpress.us/item/1005008743123631.html https://www.aliexpress.us/item/1005008743123631.html There is also the 572 which is the same hardware with most of the flash taken up by a BLE stack. Muse Lab have their usual min-dev boards (that you can use on a breadboard or solder to a larger PCB) for those: https://www.aliexpress.us/item/1005009123215735.html https://www.aliexpress.us/item/1005009123215735.html Muse Lab CH32V002/3/4 board (I use these): https://www.aliexpress.us/item/1005005221751705.html https://www.aliexpress.us/item/1005005221751705.html As well as WCH, they also have FPGA and ESP32 boards. Definitely recommend this manufacturer! https://miusecntech-muselab.aliexpress.us/store/5940159 https://miusecntech-muselab.aliexpress.us/store/5940159