The 3-Second Audition
The average professional receives 121 emails per day. In this crowded inbox, your subject line is a "Gatekeeper." It has exactly 3 seconds to convince the user to click before they scroll past—or worse, hit delete.
This tool evaluates your text based on the "4 U's" of Copywriting: Is it Useful? Is it Urgent? Is it Unique? Is it Ultra-specific? If you score low on "Urgency" or "Curiosity," our algorithm suggests power words to increase your Open Rate (OR).
[Image of email funnel diagram]Mobile Truncation Rules
60% of emails are opened on mobile. If your hook is at the end of the sentence, it will get cut off.
- iPhone (Vertical): ~41 Characters
- Android (Vertical): ~30-60 Characters
- Desktop: ~60-70 Characters
Optimization in Action
Small tweaks lead to massive differences in open rates. Here is how to transform a "boring" subject line into a high-converting one.
| Weak Subject Line | The Problem | Optimized Version |
|---|---|---|
| "Meeting Reminder" | Too vague. | "Meeting in 10 mins: Strategy Sync" |
| "Check this out!" | Looks like spam. | "The tool you asked for (Link inside)" |
Avoiding the "Promotions" Tab
Modern spam filters analyze Sender Reputation and Trigger Words. Using "Salesy" language triggers a penalty score.
"100% Free", "Make Money", "Guarantee", "$$$", "Risk-Free", "Urgent".
The "Preheader" Hack
The subject line has a wingman: The Preview Text. Don't waste it!
...and the salary is $120k + Equity.