The best replacement for nik is topaz.

The best alternatives to nik are rated as following:
★★★★★  topaz
★★★★  onone
★★★  alien skin
★★★  photomatix
★★  vsco
★★  perfect photo suite
★★  topaz labs
★★  dxo
★  onone software
  nik

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

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



Google Trends

Scale is based on the average worldwide traffic of nik in all years. Click on graph for more.
nik
topaz
onone