The best replacement for corn starch is potato starch.

The best alternatives to corn starch are rated as following:
★★★★★  potato starch
★★★★★  corn flour
★★★★  flour
★★★★  corn meal
★★  corn syrup
★★  baking powder
★  tapioca starch
★  baby powder
★  tapioca
★  arrowroot
★  talc
  all purpose flour
  xanthan gum
  wheat starch
  modified corn starch
  maltodextrin
  clear jel
  baking soda
  cornstarch
  waxy maize
  talcum powder
  talc powder

Your alternative for corn starch is not listed? Suggest!
Speaking about corn starch, one probably shouldn't forget about flour.

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



Google Trends

Scale is based on the average worldwide traffic of corn starch in all years. Click on graph for more.
corn starch
potato starch
corn flour