Gadget review site Retrevo challenges Amazon.com

Retrevo built machine learning technology to effectively research the more than 50,000 consumer electronics products that hit the market in a typical year.

"It is almost impossible as humans to review that many products and keep prices updated, so we put machines to work to solve this problem," Rathi said.

"We crawl the Web and look at consumer sentiment as well as price to make recommendations on what is a bargain," he continued.

Retrevo provides information on technologies that are rising or fading, and graphically maps which devices provide the "best bang for the buck."

The website also added a "do not add to cart" button that prevents people from buying gadgets it does not recommend.... Click Here to read more.