There is a 14 day free trial.
Here is my affiliate code: it won't cost you any more but helps Descript to know who is sharing their app.
https://www.descript.com/?pscd=get.descript.com&ps_partner_key=amltamFtZXM4OTkz&ps_xid=vKitMmsZl3JFOj&gsxid=vKitMmsZl3JFOj&gspk=amltamFtZXM4OTkz