I might be late to this party but I recently noticed a VLsub option in VLC itself that makes manually adding subs way easier. It’s not automatic like the other tools mentioned but it’s still a huge time saver. Protip I noticed if you’re struggling to find a movie with it, just drop the imdb tt code into the name search box.

I had this movie at the top of my list stuck at 71% for at least two years. Hundreds of other torrents came and went. Its easier to find it these days.

Totally worth it