In this blog post, we’ll cover 11 free and premium subject line testers you can use to generate better results. We’ll share everything from tools that measure the emotional effect of words on readers to the those that will help you find the perfect mobile-friendly subject line length and save your emails from dreaded spam filters. While creating subject lines still involves a degree of creativity, technology has made it possible to leverage data. In the list below, you’ll find various tools that each offer different features and functionality. Some are more sophisticated than others, but even the less feature-packed tools provide a unique perspective that can help you generate results.
Subject Line Testers: 11 Tools to Increase Open Rates:
Boost your email open rates: analyze and improve your subject lines with our free tester before sending out your next campaign.
Wording Characters Character count Your subject line is a bit long. Subject lines with 21-40 characters tend to see higher open rates. Can you make yours any shorter? Words Word count
Your subject line contains helpful words, nice! People ate more likely to open emails when they see words like these. TWe recommend that you remove the following words as they may be harmful - . Your subject line doesn’t contain any words that could be considered harmful. Hello - your subject line contains spammy words that may land your email in the spam folder. Great job, your subject line does not contain any spammy words. No excessive punctuation here! Nice work. Too much punctuation can harm your open rates. Sentence Case Bravo! Subject lines perform best when they’re written in sentence case — like yours. None Numbers help subject lines stand out and are proven to increase open rates. Using one in yours could make all the difference! If it fits the context, of course.
1. Mizy by Automizy
Leverage AI and Deep Learning to create better subject lines. Price: Free Mizy’s claim is that it looks at subject lines differently. Unlike other subject line testers, Mizy uses AI and deep learning to help you find the perfect email subject line. What’s more, Mizy accesses a database of emails and knows what their open and click-through rates are. This is made possible with Mizy’s deep learning neural network. It’s capable of collecting data and restructuring itself to provide more helpful insights on what’s working and what isn’t to generate better email results. Once you’ve entered your subject line, Mizy will generate a performance rating (out of 100) and also share tips on how to improve your copy.
2. Test Subject by Zurb
Create mobile-friendly email subject lines. Price: Free Most people don’t know this but email subject lines on mobile devices are often truncated. The outcome? Subject lines that appear to be lengthy and almost painful to read. Zurb realised this and took action. Their product design team built Test Subject to ensure that email subject lines on mobile get the attention they need to generate results. And it was a good call. In the US alone, over 57% of all internet traffic comes from smartphones, and analysts expect the number of emails from businesses and consumers to increase to 347 billion by 2023. Being able to optimize email subject lines for mobile will make for smarter and more appealing and effective email marketing.
3. Email Subject Line Grader by Net Atlantic
Measure the impact of character count, emotion and power words. Price: Free Email Subject Line Grader offers a performance score based on four criteria. These are:
Subject line type
A classification of the type of subject line you’ve created. (think “how-to” or “question” subject lines). Users also receive tips on how to strengthen their subject lines.
Character count
The number of characters used. Research shows that the most effective email subject lines have 60 characters or less. The tool will tell you how long your subject line is and also makes recommendations based on subject line length.
Word count
The number of words used. Get feedback on the ideal number of words to capture reader attention.
Word mixture and balance
A measure of the number of action, emotion and power words used. If your subject line is missing one of these, the tool will advise you to include a few to strengthen your copy.
4. Send Check It
Use 16 criteria to score the quality of your copy. Price: Free Send Check It is one of the more in-depth subject line testers. In addition to an overall score, it offers a list of 16 criteria that subject lines are measured against, along with tips on how to strengthen your subject line. And the list of criteria is rather helpful. It covers spam elements, punctuation and whether you’ve included emojis. Here’s a complete list of all 16 criteria:
Scannability Reading Grade Level Length (characters and word) Preview Sentiment (positive or negative words used) If the word “free” appears) Spammy Words Bad Tab Words If an exclamation mark appears Whether you use all Caps words Whether punctuation is included Personalization (name, industry, title, interest, or geographic info.) If your subject line includes a question Whether you use all lowercase words Whether your subject line includes emoji
5. Spam Check by Postmark
Measure the spam score of incoming and outgoing email. Price: Free Spam filters are brutal. They can crush email marketing campaigns, making it harder to generate positive results. But thanks to Postmark, you can beat spam filters. Spam Check allows you to enter the complete contents of your email (subject line included) into their tool. It then analyzes the contents and provides a spam score.
Spam scores can be somewhat complex to understand due to various providers offering different interpretations. Postmark uses Spam Assasin. Visit this article for a breakdown of how to interpret your score and then improve it.
6. Touchstone
Compare your subject line to a database of 21 billion emails. Price: Essential, $69; Expert, $99; Enterprise, $297 Touchstone is a virtual subject line testing platform. It allows you to test subject lines against a database of over 21 billion emails. Results show performance as a percentage which indicates how your subject line would perform compared to similar subject lines for similar emails in your industry. You’re also able to test up to 10 subject lines at a time, making it possible to find the best version as fast as possible.
7. SubjectLine.com
Score your subject line against 800 unique rules to find the best version. Price: Free SubjectLine.com offers one of the more robust screening tests for subject lines. According to the service, the tool uses over 800 unique rules to test and evaluate filtering and deliverability issues. In short, your results are set to be a good indicator or how well your copy will perform. Results show a score with an indication of where your subject line loses points. You also receive advice in the form of a short blurb on how to improve your copy.
8. ISnotSPAM
Beat spam filters. Price: Free Worried about our emails being flagged by spam filters? Try ISnotSPAM. While it’s typically used for testing the contents of an email, it can also be used for subject lines. It performs five tests that include:
SPF Check Sender-ID Check DomainKeys Check DKIM Check SpamAssassin Check
To get started, visit the tool’s page and copy the unique email address provided. Use the email address and send your subject line to the address by pasting it in the body of your email (leave). Next, click the “View Your Report” button for results. Note: results can take up to three minutes to appear.
9. Emotional Marketing Value Headline Analyzer by The Advanced Marketing Institute
Measure the Emotional Marketing Value (EMV) of words to create more compelling subject lines. Price: Free Emotional Marketing Value is a score that measures how a group of words elicits an emotional reaction. And while that may sound a little hard to imagine, it’s based on government research by Dr Hakim Chishti, back in the ‘60s and ‘70s. While this tool was designed for headlines, it can be used for email subject lines which are really just headlines for emails. They are both designed to do the same thing, get your reader to keep reading. The Emotional Marketing Value Headline Analyser will provide an overall score of your copy. It also indicates what type of audience your copy appeals to.
10. Subject Line Tester from Moosend
Use AI to rate the quality of your subject line and compare it to your industry benchmark. Price: Free Like Mizy, Moosend’s subject line tester uses AI to perform real-time analysis. Your results are displayed in comparison to your industry, giving you a good indication of how well your subject line will perform. The tool also offers tips on how to boost your open rate.
11. Email Subject Line Tester by CoSchedule
While CoSchedule is better-known for its content marketing software, its email subject line tester tool is likely one of the most helpful available today. It’s designed to help marketers create subject lines that are more human and convert more. It does this by grading your copy according to eight criteria. Criteria include:
Overall score out of 100. The higher your score the more effective your subject line. Use of words that increase opens. These are positive words or words from CoSchedule’s Word Bank. The tool also lets you know if you include any negative words that can hurt your open rates. Case. Get feedback on which case works best for subject lines. Numbers. Whether you’ve included any numbers. Character count. The number of characters used. Word count. The number of words used. Emoji count. How many emojis used. Appearance preview. Get a preview of how your subject line will look on desktop and mobile.
Conclusion
While some subject line tools offer a deep level of insight, be sure to test more than one. As you can tell, not all tools are created equally. So pair them up. Test for mobile-friendly views, spam filter immunity, emotional marketing value, character length, and more. Together, these tools will help you find the sweet spot, where creativity meets data and technology to help boost your email open rates.
