Does a high score guarantee opens?

No, but it moves the odds heavily in your favor by avoiding technical pitfalls.

What is a mobile-first subject line?

One where the most important words are in the first 30 characters.

Avoid "Click here", "Earn $$$", "Free", and "Don't delete".

A positive or curious sentiment usually outperforms neutral or negative ones.

Yes, sentence case or title case is generally more professional than all caps or all lowercase.

Yes, the tester accounts for emoji impact and placement.

The point where an email client cuts off the text because the subject line is too long.

Follow the specific advice provided in the results section, like shortening the length or removing a spam word.

The Email Subject Line Tester analyzes your subject line against industry data to predict its performance and identify potential red flags.

AI-written reply suggestions

Automated follow-up sequences

Campaign open & click tracking

Unlimited connected accounts

The Email Subject Line Tester analyzes your subject line against industry data to predict its performance and identify potential red flags.

AI-written reply suggestions

Automated follow-up sequences

Campaign open & click tracking

Unlimited connected accounts