There currently isn’t a way to see upvotes and downvotes separately in Sync like there is in some apps like Jerboa (I was wondering the same thing a few days ago), but it’s listed as an enhancement request on Sync’s GitHub so hopefully it’ll be added at some point!

Since Sync was developed for reddit originally, there is no way to see that currently.

Either that or “controversial” worked back into Sync’s algorithms. This feature and the missing “sync” feature are deal breakers for me, as much as I love this app.