Just Average
Local (UAE, Saudi and part of Middle East) competitor of Uber.
As a plus they offer pre booking (more expensive rate).
Generally the service is more expensive than their direct competitor.
Customer service its OK in UAE, a disaster in the other countries where often arrive a taxi instead of a black cab.
The app its ok and quite stabile.
Its missing the possibility to modify a booking when pre booked.
UM78 about
Careem كريم - Online Cab Booking App, v5.6