ab-testing-patterns
Installation
SKILL.md
plugin: instantly updated: 2026-01-20
A/B Testing Patterns
Testing Fundamentals
One Variable at a Time
CRITICAL: Only change one element per test for clear attribution.
| Test Type | Variable | Keep Same |
|---|---|---|
| Subject Line | Subject only | Body, CTA, timing |
| Opening Line | First sentence | Subject, rest of body |
| CTA | Call to action | Subject, body intro |
| Send Time | Delivery time | All copy elements |