5 free tools to improve your email subject lines

There is no denying the effectiveness of email marketing as a marketing channel to help you connect with your audience on a personal level. If your business has a website, email marketing is for you.

The reason why many businesses avoid email marketing is because:

  • They are concerned that their emails will be mistaken for spam.
  • They believe it will be too expensive to design campaigns that stand out in a crowded inbox.
  • They don’t understand the value of email marketing.

One of the most important aspects of your email campaigns are your email subject lines. This is the first thing your subscribers will see when they receive any campaign from you. Apart from needing a great email marketing platform to send your campaigns to your subscribers, you could look at our round up of FREE subject line tester tools to help you create compelling, click-worthy subject lines, so you can achieve your email marketing goals.

1. SubjectLine.com

With this online tool, you are able to evaluate your subject line for free. SubjectLine.com rates email subject lines on a scale of 100. Based on best practices for email subject lines, it adds and subtracts points to show email deliverability and marketing performance.

2. Mizy by Automizy

Mizy is an Artificial Intelligence tool that tests your subject lines and gives you tips based on real campaigns.

Mizy does this in order for you to:

  • Improve the open rates of your email campaigns significantly.
  • Have a higher click-through rate.
  • Get more subscribers for your web pages.
  • Increase your revenue from your campaigns.

3. Email Subject Line Grader by Net Atlantic

Email Subject Line Grader is a free online tool that analyses whether a subject line is generic, how-to or list-oriented. It also counts the number of words and characters. It observes if the subject line has no more than 7 words, as a subject line with 6 or 7 words is ideal.

4. Zurb

The majority of people access emails on their mobile devices and as the usage of digital technology grows exponentially, this percentage will inevitably rise.

At Zurb, TestSubject is a free tool you can use that has some nifty features. If you’d like to see how your email is going to render on a mobile phone device, this tool allows you to do that. You can, therefore, preview your campaign on multiple mobile devices at once, which can help you cut down on testing time. All you need to do is copy and paste your text and you’ll get instant previews.

5. Send Check It

With Send Check It, you can have your subject line compared to 100,000+ other emails.

Besides the comparison, the tool offers advice on how to make your subject line stronger. It evaluates your subject line based on 16 different factors, such as the headline's length and readability, to name two. The tool also provides a preview of the email that will appear in your subscribers' inbox.

In both desktop and mobile modes, it shows how the email's subject line and sender name might look. The subject line of your email can also be subjected to a thorough sentiment analysis.

This means you can determine whether your subject line will make your readers feel positive, negative or neutral. The tool also runs a comprehensive check, looking for words that spam filters might flag.

We sincerely hope you've enjoyed reading about these free tools that you can use to create the best subject lines for your email marketing campaigns. Do you have any favourite tools that we haven't mentioned? Let us know in the comments section.


Contact us
for help

Fill out the form and we will get back to you.

Join Our

Ready to enhance your email marketing campaigns?
Sign up to our weekly email newsletter for email marketing news, tips and tricks.