Useless
Tried your app in Singapore. Never mind taxi drivers who can barely speak English, they can't even find you! It's both the app's geolocation and rubbish pick up spot interface. Wasted an hour setting up the app and waiting for ordered taxis who just pass by the approximate location you ordered, give or take 50m and put you as "no show", which makes it impossible to get the car you ordered. I also suspect car number mistakes, as once a driver miraculously passed by me looking for the person who ordered the taxi and find nobody. And I got another "no show" as he disappeared, the car with a different number. Conclusion: the taxi stands, even with queues, proved a lot faster and more efficient at actually getting cars.