Most free video translators are free in the same way a trial is free: a watermark across the middle, a 720p cap, or a login wall before you can see whether the subtitles are any good.
The free tier here is a length limit instead — under 60 seconds of video, with no watermark, no account and no downgrade in resolution. That is enough to test the tool on your own footage and decide whether it is worth anything to you.
Longer videos cost 1 credit per minute, and $1 buys 20 credits. There is no subscription — you buy credits when you need them, and unused credits stay in the account.