Blog

Donnu A/B Blog

Complete, honest guides on CRO, A/B testing and experimentation: statistics, sample size, test design and what to do with the results. No fluff. (page 17 of 24)

Email Marketing

A/B Testing Email Marketing: The Complete Guide

Complete guide to A/B testing email marketing: what to test, why open rate misleads, and how to decide with real statistical significance.

Email Marketing

A/B Testing Email Subject Lines the Right Way

How to A/B test email subject lines: what to vary, real sample sizes, and why open rate is the right metric for this specific test.

Email Marketing

Cart Abandonment Email A/B Tests That Move Revenue

How to A/B test cart abandonment emails: what to vary, why purchase is the only honest metric, and how to size the test at a 1 to 2 percent base rate.

Pricing

A/B Testing Discounts and Promos Without Killing Margin

Discount testing done right: what to vary, why revenue per visitor beats conversion, and how to size a test that will not quietly erode margin.

Email Marketing

Email Send Time Optimization: Does Testing It Work?

How to A/B test email send time honestly: why open timestamps lie, what a send time test confounds, and the sample size it really needs.

Pricing

Freemium Paywall Experiments: What to Test and How to Decide

Freemium paywall testing: where to place the trigger, which metric actually decides the test, and how to size a test when free-to-paid is low.

Pricing

How to A/B Test Pricing: The Complete Guide

A/b test pricing the right way: why revenue per visitor beats conversion, how to design a clean test, and the legal traps to avoid.

Pricing

Price Anchoring: Does Showing a Higher Price First Work?

A price anchoring test measures whether a higher reference price shifts revenue per visitor, not just which tier gets clicked. Full guide.

Lifecycle Marketing

Push Notification A/B Testing: A Practical Guide

How to A/B test push notifications: why opt-in changes who enters the test, the sample a low CTR demands, and the guardrail that stops a false win.