http://www.evanmiller.org/ab-testing/sample-size.html

https://www.convert.com/

https://www.optimizely.com

https://sitegainer.com

https://vwo.com/

http://www.adobe.com/marketing-cloud/testing-targeting.html

http://pii.invesp.com/

https://www.abtasty.com/

http://www.sitespect.com/

http://www.qubit.com/solutions/ab-mv-testing

https://zarget.com

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