Visual Website Optimizer offers AB and MVT testing services, like Google Website Optimizer, but more complete, if it was possible. I won’t be able to test this service right now, as the price ($49 monthly), though affordable, won’t make me reny Google almighty. But well, maybe, one day… Anyway, Paras Chopra, the founder of this service published a very interesting guide to AB testing in Smashing Magazine. And a very useful free application on the website allows to calculate the duration your AB test should be, according to the traffic and number of combinations. Thanks!

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