What tools calculate statistical significance?

Several tools help calculate statistical significance for email tests:

Online calculators: Evan Miller's A/B Test Calculator provides simple, reliable significance calculations. AB Test Guide offers calculators for sample size and significance. VWO's calculator handles both planning and analysis.

ESP built-in analysis: Most major platforms like Mailchimp, Klaviyo, and HubSpot automatically calculate significance for their A/B testing features.

Statistical software: Google Sheets with statistical functions, Excel, R, or Python for custom analysis.

Experimentation platforms: Optimizely and AB Tasty provide sophisticated statistical engines for enterprise testing programs.

The tool matters less than using it correctly. Simple online calculators produce valid results when fed accurate inputs.