Sometimes the only way to get info to the developers is via the reviews. Well, so here's a try. The App is missing the the so-called South Island Line from Admiralty to South Horizons. It is also missing the extension of the Kwan Tong Line from Yau Ma Tei to Whampoa. If you ask me, I'd say these kinds of things are sort of important when you are giving people subway guidance? Don't you think?

Quick simple and functional way to navigate Hong Kong's subway system. Great route planner, easy to read while on the rush. The only glitch is that is mistakenly took the airport express line as part of the subway system and would route through it occasionally. The airport express in not part of the generic subway system and requires a separate ticket. Still, not a big problem once you know about this small glitch as there is a parallel line for most of the way and you just get used to replace one for the other mentally.

Loved it

This saved me a lot of time planning trips around HK.

Perfect!