Cómo se usa
Enter total visitors and conversions for each variant. The tool returns both conversion rates, the difference, and a significance value indicating how likely that difference is to be chance.
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Significancia de test A/B
Introduce los datos necesarios, ejecuta la herramienta de forma segura y consulta al instante un resultado medible.
Utilidad local
Esta herramienta no llama a ningún servicio externo. Los datos sensibles introducidos no se conservan.
Qué comprueba esta herramienta
The difference between the two rates is evaluated with a two-proportion z-test. The calculation uses only the four numbers you enter.
Cómo leer el resultado
Significance does not prove the difference is real; it states how unlikely the observed gap is under chance alone. A 95% confidence threshold is common convention, not a mathematical requirement. A test that does not reach significance usually means "not enough data yet" rather than "no difference".
Ejemplos
Compare two landing page variants, two headlines, or two form lengths.
Casos de uso
Useful for campaign teams, landing page owners and conversion optimisation work.
Errores frecuentes
The most damaging mistake is stopping the moment significance appears, which sharply increases false positives. The second is ending mid-week: weekday and weekend behaviour differ. The third is changing more than one variable and attributing the difference to a single cause.
Límites de esta herramienta
The tool knows nothing beyond the numbers you type. It cannot see whether traffic was actually randomised, whether the same user was counted twice, seasonality, or a campaign running at the same time. Without those, the result is arithmetically correct but practically misleading.
Privacidad y tratamiento de datos
The numbers you enter are not stored; only an anonymised run record is kept.
Preguntas frecuentes
When should I stop the test?
Decide the duration and sample size before starting and hold to it. Stopping as soon as significance appears inflates the false positive rate.
Does 95% significance prove the difference is real?
No. It says the observed difference is unlikely under chance alone; it is not a claim of certainty.
Can I use it with low traffic?
You can, but reaching significance is hard at low volumes and any result you do get is fragile.