The best replacement for aprs is dstar.

The best alternatives to aprs are rated as following:
★★★★★  dstar
★★  ais
★  ears
  d-star
  d star

Your alternative for aprs is not listed? Suggest!
Speaking about aprs, one probably shouldn't forget about ht.

Other search terms related to aprs and their ratings are:
★★★★★ ht
★★★★★ google earth
★★★★ baofeng
You have in mind a companion for aprs and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of aprs in all years. Click on graph for more.
aprs
dstar
ais