Compare the online ratings of two items

Sometimes it is not clear whether one item is really better than another based on their online ratings, especially when the number of ratings is not very large. Entering ratings for two items into the form below uses a statistical model based on a large database of Amazon ratings to estimate the probability that one is truly rated better, on average, than the other.

How it works

Enter URLs for two products (currently limited to Amazon URLs):

Or, enter ratings data for two products:

Item A Item B
1 star
2 star
3 star
4 star
5 star

If you are a developer and you like this tool, please consider using the API implementation.

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