Subject Line Testing Swipe File: 100 Formulas + A/B Test Tracker

What This Is

A collection of 100 subject line formulas organized by goal (curiosity, urgency, benefit, social proof) plus an A/B testing tracker to systematically improve your email open rates. Inspired by The Hustle's obsession with testing every detail until they found what worked.

Why You Need This

The Hustle didn't build 1.5 million subscribers by accident. They tested subject lines relentlessly until they knew exactly what made people open. Most founders write subject lines in 30 seconds and wonder why their open rates are stuck at 15%. This swipe file gives you proven formulas to test, and the tracking system to learn what works for your audience.