This is without a doubt the best app to use when shopping. It just sits in the background until you look at an item you're thinking about buying. At that point it pops up and lets you know if it's the best price or tells you who has a better price. On top of that you earn honey gold which you can cash in for a gift card when you have 2000 points. It doesn't take long to get 2000 either.
The icing on the cake is "It's all free". I have been using honey for several years and have not had any problems at all !