Blog

Donnu A/B Blog

Complete, honest guides on CRO, A/B testing and experimentation. The most complete articles on the web, no fluff. (page 17 of 17)

Tools

CRO Tools Compared: A Neutral Guide by Category (2026)

A neutral guide to the best CRO tools: analytics, heatmaps, and A/B testing platforms compared by criteria, not marketing.

A/B Testing

How to Write an A/B Test Hypothesis (with a Free Template)

Learn how to write a strong A/B test hypothesis with a free template, worked examples, and a sample size calculator to size it right.

A/B Testing

Common A/B Testing Mistakes & Validity Threats

Six A/B testing mistakes that quietly invalidate results: peeking, SRM, novelty effects, Simpson's Paradox, plus the warning sign and fix for each.

Statistics

Bayesian A/B Testing: The Complete Guide (vs Frequentist)

Bayesian A/B testing explained: priors, posteriors, P(B beats A), expected loss, a worked example, and when to choose it over frequentist testing.

CRO

Conversion Rate Optimization (CRO): The Complete 2026 Guide

Conversion rate optimization explained: formulas, benchmarks, a full process, prioritization frameworks, and live calculators for ecommerce and SaaS.

Statistics

The Peeking Problem in A/B Testing (And How to Fix It)

Checking your A/B test daily and stopping at the first win inflates your false positive rate. The math behind the peeking problem, and how to avoid it.

Statistics

A/B Testing Statistical Significance: Plain-English Guide

Statistical significance in A/B testing explained in plain English, with the full z-test formula, a worked example, and free live calculators.

A/B Testing

How to Run an A/B Test: Step-by-Step Guide

A complete, honest walkthrough of running an A/B test: hypothesis, sample size, setup, avoiding peeking, and reading results, with a free calculator.

A/B Testing

What is A/B testing? The definitive guide (2026)

A/B testing from zero to advanced: how it works, how many visitors you need, the mistakes that invalidate results, and how to call a winner honestly.