descript.com works pretty well, but it's not free. Under the hood, it uses Google Speech-to-Text, so if you were creative enough, you could probably build somet

descript.com works pretty well, but it's not free. Under the hood, it uses Google Speech-to-Text, so if you were creative enough, you could probably build something similar. I find it easier to pay descript.com when I need it. :) You can export tracks back out to video and audio multi-track editing apps with the Pro plan.