Hattrick is a web based game. And the web has become very portable in the last few years. With the rise of the smart-phone the internet found a new medium: the world of the Apps. The advantage of an app is that you can access the functionality with a push on the short-cut. Login-credentials are stored in the app, no web address needs to be typed in and navigation through the functions is done with nice big buttons on a potentially small screen.
The webinterface of Hattrick is an enormous amount of features. Managing all this might be too much to ask for an app. Actually I do find it too much to ask. The only feature I use from Hattrick apps is the match viewer with notifications.
Androick

Androick has between 50.000 and 100.000 users and has a rating of 4.5 out of 5 by 819 users. Personally I’m less impressed by this app. Although the basic functionalities like player and competition overview are working fine. I always have difficulties.
SmartHT Live

SmartHT Live only has between 1000 and 5000 users. It’s also free of charge and has a user rating of 5 out of 5. Although this is based on only 28 experiences. I would also rate this app with 5 stars. It’s only a match viewer, but the auto updates function is great. Activate the notifications for the matches you’re interested in. Only for the goals, or for all events and then set the update interval. SmartHT is my favourite match viewer for when I’m not behind my pc.