The best replacement for baking powder is baking soda.

The best alternatives to baking powder are rated as following:
★★★★★  baking soda
★★★★  yeast
★  cornstarch
★  flour
★  soda
★  corn starch
★  baking soda in pancakes
★  cream of tartar
★  baking soda for cookies
  bicarbonate of soda
  baking soda cookies
  double acting baking powder
  self raising flour
  baking powder
  baking mix
  soda for cake
  dry yeast
  baking soda difference
  baking soda pancakes
  soda for cookies
  baking flour
  bicarb soda
  baking soda in cakes
  double action baking powder

Your alternative for baking powder is not listed? Suggest!
Speaking about baking powder, one probably shouldn't forget about baking soda.

Other search terms related to baking powder and their ratings are:

★★★★★ baking soda
★★★ cream of tartar
★★ buttermilk
plain flour
self raising flour
self rising flour
cream tartar
all purpose flour
You have in mind a companion for baking powder and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of baking powder in all years. Click on graph for more.
baking powder
baking soda