title: Is there any restriction for number of requests in Mapkit and MKDirections?
body: <p>I used Google Maps API <strong><a href="https://maps.googleapis.com/maps/api/directions/json" rel="nofollow noreferrer">https://maps.googleapis.com/maps/api/directions/json</a></strong> for drawing route and getting direction, but when its usees increases, we have to pay charges. 
  I check in iOS and get that we use mapkit's MKDirections but I have a question that 
  Is there any charges for its uses or any limitation?
  If there is no limits, is there any the drawbacks of using MapKit? 
  Is there any cases when Google Maps API become more helpful? </p>