February 13, 2013, 12:40 PM

Costco, Overstock and Apple top January availability ratings

Costco and Overstock led IE availability tests while Overstock and Apple led for Firefox.

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Costco.com and Overstock.com had the best availability scores in Internet Explorer testing among large retailers measured in January, says Compuware Gomez. Last month, the two retailers posted 100% availability in Internet Explorer tests. Apple.com and Overstock.com led Firefox availability tests with 100% availability.

HPShopping.com came in third place behind Costco and Overstock in Internet Explorer tests with 99.99% availability. Amway.com and Toysrus.com tied in fourth at 99.98% availability.

In Firefox testing, Macys.com and Williams-Sonoma.com tied for third place, following Apple.com and Overstock.com with a 99.99% availability score for the month. HPShopping.com came in fifth at 99.98%.

The average Internet Explorer availability score among the 22 retailers measured in January was 99.75%. The same group of retailers produced an average Firefox score of 99.72%.

Availability is determined by the percentage of tests in which the retailer’s web site loads correctly.

Click here for the full test results.

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