This is the Flamma FM10 mixer, which comes with an onboard amp sim that can be controlled via Type-C USB to your phone or PC. This is incredibly cool for people like me who don't have the money for amps, and don't wanna bring a weak laptop that can't run ASIO at low latency without clicking/distortion.
The app/program is used to change the on-board amp simulator and other settings. The mixer will then remember these settings and store them on-board, so you can just bring the mixer and have a decent amp simulator without needing a beefy laptop AND a mixer for the inputs and outputs. It's certainly not perfect, but seems more than acceptable for a first-of-its-kind mixer with an on-board amp sim. It feels like the thing was built specifically to target people like me, who don't have a whole lot of money to spend on expensive equipment to bring with me to a gig. Gonna look at getting this some time in the future, but if you need something like this, now is a great time. It's on sale!