The latest challenge to car services like Uber came out of City Hall Monday when an Upper East Side council member introduced a bill to create a free city mobile app for yellow and green taxis.

The bill, introduced by Council Member Ben Kallos, would create a universal E-Hail App for the more than 13,000 yellow cabs and 6,000 green cabs throughout the city, he said in a statement.

"City taxis need an app of their own to compete, and New Yorkers should be able to e-hail a cab in the rain without having to worry about surge pricing," Kallos said, adding that the "city must modernize to be able to compete."