The best replacement for oa is ra.

The best alternatives to oa are rated as following:
★★★★★  ra
★★  op
★  fa
  djd
  tops
  cdb
  ra xrays
  faa
  ra worse

Your alternative for oa is not listed? Suggest!
Speaking about oa, one probably shouldn't forget about ace 2.

Other search terms related to oa and their ratings are:
★★★★★ ace 2
You have in mind a companion for oa and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of oa in all years. Click on graph for more.
oa
ra
op