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Comprehensive statistical tools to plan, analyze, and learn from your experiments.
No fluff, just the tools you need to make data-driven decisions with confidence.
Industry-standard statistical calculations powered by proven algorithms.
All calculations run in your browser. Your data never leaves your device.
No subscriptions, no paywalls. All tools are completely free to use.
Interactive charts help you understand your results at a glance.
A beginner-friendly A/B testing crash course that covers experimentation from fundamentals to advanced topics. 100% free, no signup required.
From fundamentals to advanced topics—learn the statistics, frameworks, and pitfalls through 12 comprehensive sections with interactive quizzes and visual charts.
What is A/B testing, history, and reality check
Jargon, metrics, implementation, test plans
Bayesian vs Frequentist, hypothesis testing
Power analysis, common pitfalls, SRM
Curated job opportunities in A/B testing, experimentation, and growth optimization from top companies worldwide.
Browse All JobsCurated books, articles, and courses to sharpen your experimentation skills.