Voyager has an app in TestFlight right now. Not sure what you consider native, but it uses the ionic framework. I stopped using the PWA on iOS due to a scrolling bug that couldn’t be fixed by the voyager dev. The ionic version seems to working well so far though!

I'm constantly upvoting/downvoting things on accident on mobile. Something I'd like these mobile apps to implement, is the ability to disable voting so I can avoid this. I'm mainly a lurker having vote history available is a little concerning to me.