Did your variant actually win?
A two-proportion Welch’s z-test, computed in your browser. Plug in two variants — get the lift, p-value, z-score and a clear ship/keep-running call.
Inputs
Two variants. Conversion = any goal event (purchase, add-to-cart, sign-up).
Result
FAQ
What test does this use?+
A two-proportion z-test (Welch’s) with a normal-approximation two-tailed p-value. The same approach we ship in the Idukki dashboard.
When is a result significant?+
Conventionally when p < 0.05. We highlight that threshold in green; any larger p value gets the amber “keep running” state.
How big a sample do I need?+
The calculator outputs the per-arm sample size required to detect the observed effect at α=0.05 and 80% power, using meanP across the two arms.
Is the math the same as in Idukki?+
Yes — lib/stats.ts in the dashboard implements an identical z-test and sample-size formula.
Want to ship one of these?
Talk to us — we’ll get the right tool live on your stack.
Day-1 sample data on your live IG / TikTok / Reviews, plus a setup plan tailored to Shopify, WooCommerce, BigCommerce, Wix or any HTML site.
- No credit card
- Cancel anytime
- SOC 2 + GDPR
