Resources
Everything we have published, in one place
Eighteen free calculators, guides to A/B testing and attribution, honest tool comparisons, and walkthroughs of the product. Start wherever your question is.
Calculators and tools
Eighteen free tools that run in your browser. No signup, no tracking.
Sample size calculatorHow much traffic a test needs before it can tell you anything.Test duration calculatorHow long to run it, so you stop guessing on day three.Significance calculatorWhether a result is real or noise.Page revenue auditScore any page and see what the leak is worth.ROAS calculatorReturn on ad spend, per campaign.AI search visibility checkerWhether answer engines are citing you at all.
A/B testing guides
The statistics you need, and the traps that invalidate a result.
12 best A/B testing tools in 2026Ranked by what each one lets you stop paying for.Statistical significance explainedP-values and confidence, without the stats degree.Minimum detectable effectThe number that decides whether a test is worth running.Multivariate vs A/B testingWhen you have the traffic for one and not the other.Landing page A/B testingTurning an observation into a testable hypothesis.A/B testing for SaaSTesting trial funnels and pricing pages.
Analytics and attribution
Measuring without cookies, and tying the result back to revenue.
Best revenue attribution toolsCompared by attribution model and billing integration.Cookie-free analytics, how it worksThe actual mechanisms, plus eight tools compared.10 GA4 alternativesWhat marketers switch to, and what each one costs.Funnel analysisFinding the step that is losing you money.Track ChatGPT and Claude trafficAnswer engines are a channel now. Measure it.AEO analyticsHow to tell whether AI search optimization worked.
Agents and MCP
Pointing Claude or Codex at your funnel, and what it can actually do once connected.
Comparisons
Honest head-to-heads, including where the other tool wins.
Walkthroughs and help
Setup, troubleshooting, and answers to the common questions.
Stop reading, start testing
Every guide here ends in the same place.
Install one 36 KB script, find the drop-off, and ship the test that fixes it. Scored in real revenue, not clicks.