No apps, as it is costly to build one. Many use Tapatalk but there are security issues and Tapatalk is owned by China. I heard some other forums have had trouble with Tapatalk in the past so I did not go with them yet.
Our forums are now 100% mobile responsive, so browsing on mobile is really easy and comfortable, so the software developers said that no need of App. Hopefully one day the developers of this software themselves build an App, then it will be easy to get TH on it's own app.