There are a couple of links to 3rd-party apps at the bottom of the
FAQ on the website, but they were added quite some time ago, so I don't know if these apps are still working. (If you happen to find another app that supports the pool's API, please let me know.) By the way, if you like the web/iPhone interface, last time I checked there was an option in Safari to make it accessible directly from the home screen.
All 3 of the Android apps listed still work as of a couple weeks ago. But they all just wrap the page you can get by going to the link listed under HTML under API on your dashboard page. So I put a link to that on my home screen from Firefox. It's handy to be able to check your workers and the exchange rates all in the same page.