Methodology

How this index is made

The reader we rank for is an online business, a merchant or the agency working for them, asking one question: which A/B testing tool will deliver measurable revenue impact at a defensible cost? We do not rank for feature-count, funding news or brand size.

Evidence rules

Every factual claim links to a source we actually loaded, with an access date. No search-snippet facts.
Where a vendor’s own pages contradict each other (it happens more than you would think), we say so instead of picking a side.
What we could not verify is labeled unverified, and never rated as if it existed.
Review-platform scores are only cited where we could load the page ourselves; several platforms block automated access, and we do not launder snippets into facts.

Ranking weights

30%	Statistics validity Is the shipped math correct and correctly labelled? Test choice, multiple-comparison correction, sample-ratio-mismatch detection and published error rates.
20%	Peeking protection Can you look at results daily without inflating false positives? Sequential or always-valid inference, and whether it is the default or an upsell.
20%	Revenue metrics Does the tool measure money, not just clicks? Revenue per visitor, outlier handling, order-level facts and honesty about revenue significance.
15%	Sample-size and duration tooling Can you plan a test before you run it? In-product sample-size and minimum-effect planning, pace forecasts and public calculators.
15%	Data export and methodology transparency Can you take the raw numbers out and check the math? Warehouse and API export, plus a public, specific description of the statistics.

Updates

Facts are re-checked monthly; the full ranking is re-evaluated quarterly. Each page carries its last-reviewed date. Current edition: 2026-09-02.

Independence & disclosure

This site is operated by the company named in the imprint. We link to vendors directly and use no affiliate links. If a ranked vendor relationship exists, the imprint is the authoritative disclosure.