This is Federico from Italy, I've lived in China for over two years and I like to build apps on my spare time.
Tianjin is one of the most important cities in China:
in the past few years it has seen a tremendous growth and so did its public transportation, even better: there's a lot more to come!
I've now launched a free app for your metro!
It has a beautiful intuitive map, routes description, travel times, fares and much more.
You can download it for free at https://itunes.apple.com/app/tianjin-metro/id1151262314
Thank you for reading and, please, let me now what you think
Have a nice day~