Free subject line audit

Your subject line is the first thing your prospect sees—it decides whether they open your email or ignore it. A strong subject line grabs attention, creates curiosity, and makes your message stand out in a crowded inbox. If your email doesn’t get opened, the rest doesn’t matter.

Your results are split into two parts:

1) Subject Line Scores – You’ll get an overall score plus individual scores for:

👀 Scannability – Is it easy to read at a glance?
📚 Reading Level – Is it simple and clear?
📏 Length – Is it the right length for better open rates?
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2) Common Mistakes Check – See if your subject line has any issues. If mistakes are found, fix them and run the audit again.

You can also send your subject line directly to a lemlist campaign to test it in action!

Here are some tips to craft subject lines that get opened:

Use a tool – Try our Subject Line Generator to create subject lines based on your email content.
Make it personal – Go beyond a first name. Mention a pain point, competitor, or shared interest.
Ask a question – Example: “Need help with {{painpoint}}?” or “Happy with 50% open rates?”
Create urgency – Example: “Here’s an invite to the event of the year, {{firstname}}.”
A/B test – The best way to know what works is to test different subject lines and compare results.
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Better subject lines mean more opens—and more chances to start a conversation!

No. Other things like your sender reputation, and the actual content of your email matter at least as much if not more. To boost your sender reputation, try email deliverability booster lemwarm. To check your email for spam words and other important factors, try our free Cold email audit tool.

Yes, the tool is entirely free, and you don’t have to create an account either.

You can audit one subject line at a time.

Please note that if you are not logged into on your account, we will have limited information to assist you.