Grammarly is the cheap pick. Descript is the one I'd pay for again.

I cared about how each one actually arrives at an answer. My call: reach for Descript when lets you edit audio by editing the transcript, and Grammarly when catches grammar and tone in real time everywhere. They cover different days, and pretending otherwise is how people end up paying for both and using neither.

What Descript does best: lets you edit audio by editing the transcript

What Grammarly does best: catches grammar and tone in real time everywhere

The catch on Descript: big projects get sluggish on a weak machine And Grammarly? the useful features sit behind the paywall

One honest note: the answer I could verify against a source is where Descript and Grammarly both still want a human in the loop. I stopped expecting either to be fire-and-forget.