CRO & Testing

Client side server side ab testing

Marketers of all stripes are obsessed with tools.

This obsession has bred comprehensive lists of growth tools, SEO tools, and general online marketing tools. It is no different with us in conversion optimization. We nerd out on testing tools.

Though no optimization program has ever hinged on which tool you used, there are important distinctions between A/B testing tools—from the statistics they use, their price, and more.

One thing that is often either overlooked or misunderstood is the difference between client-side and server-side testing tools.

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Confidence intervals

Confidence intervals are a standard output of many free and paid A/B testing tools. Most A/B test reports contain one or more interval estimates.

Even if you’re simply a consumer of such reports, understanding confidence intervals is helpful. If you’re in charge of preparing and presenting those reports, it’s essential.

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I love running growth teams.

It’s everything I could want from a job. It directly impacts the company, is fairly autonomous, works great with a few high-caliber folks, and involves a ton of A/B tests.

I’ve spent years running these teams—but I don’t know if I’ll ever build one again. I doubt that I’ll even have a growth team at any company I’m managing in the future.

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