The best replacement for apple maps is google maps.

The best alternatives to apple maps are rated as following:
★★★★★  google maps
★★★  waze
★★  google earth
★  tomtom
★  tomtom app
★  here
★  mapquest
★  google navigation
  google earth 3d
  google
  nokia maps
  google maps app
  navigon

Your alternative for apple maps is not listed? Suggest!
Speaking about apple maps, one probably shouldn't forget about traffic.

Other search terms related to apple maps and their ratings are:
★★★★★ traffic
★★★★ street view
You have in mind a companion for apple maps and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of apple maps in all years. Click on graph for more.
apple maps
google maps
waze