Almost 2018 and still no Tapatalk support.
See my post count? That's exactly the reason why it's so low.
Personally, I don't like using an app to access forums. I prefer ordinary sites and moving around, zooming in and out. Apps are pretty annoying. Tapatalk doesn't even work that well and it leaves that annoying message below that it was posted with Tapatalk. I know that it's just preference but I'm not sure the demand is even that high for Tapatalk.
If you're really desperate to use an app, Bitcointalk has its own app so just use that instead of Tapatalk. You could also do
this - it looks like a mobile site.
The beta site is also, well, just in beta. Feels more like alpha though on the iPhone.
The progress on that isn't exactly rapid, to say the least.