There is only one shared ride service available at Istanbul Airport.
Istanbul Havaist Shuttle Buses
Havaist is the official airport shuttle service offering direct routes from Istanbul Airport to various points in the city, including Taksim, Sultanahmet, and other central locations.
These shared buses offer fast and comfortable travel to many points in Istanbul. Cash payment is not accepted on these buses, and you can quickly purchase your ticket with your credit card on board. The buses are spacious and have a fixed route with designated stops.
There is currently no shared ride service or application other than Havaist.