It is excellent work, both the UI and the graphics. If you don't mind recommending the designer, I'd love to know who did it. With regards to getting more use

It is excellent work, both the UI and the graphics. If you don't mind recommending the designer, I'd love to know who did it. With regards to getting more users, you should at least look into how much it would cost to buy keywords such as "cab sharing" that are targeted to iOS devices. This is a purely anecdotal datum but I don't see any ads when I search for cab sharing on Google so there may not be much competition. The key question is how you can make enough revenue per user to justify acquisition costs.