Subject Line Tester Tools to Increase Number of Emails Opened

Have trouble getting people to open your emails? Some people find it hard to write clever, funny subject lines that make people want to click on them. This is where subject line tester tools can help.

Subject Line Tester Tools to Increase Number of Emails Opened

Check for spam triggers, get ideas for making your subject lines more emotional with these subject line tester tools, and get an overall grade on how clickable your emails are.

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  1. The book Test Subject by Zurb

What it checks: how it looks on mobile

Price: Nothing

Want to know how your sender name, subject line, and pre-header text will look on the most popular mobile devices right now? This tool lets you see right away how your copy will look to your readers. You know, for those times when you don’t want “Products for foolproof marketing” to turn into “Products for fool…” on someone’s iPhone 6.

  1. Net Atlantic’s Email Subject Line Grader

What it checks is the overall effectiveness of the copy, the number of words, the balance and mix of words, and the type.

Price: Nothing

Get an overall score based on how interesting your subject line is, as well as tips on how to make it better. You’ll also find out how close your word count and character count are to what’s best (50-65 characters or six-to-seven words).

Find out how well you use words and how well they fit together. Need more feeling, action, or force? Subject Line Grader tells you like it is.

  1. Check for spam by postmark

What it checks: Spam score in general

Price: Nothing

You spend time writing your emails, and you don’t want them to end up in someone’s spam folder, right? Copy and paste your subject line, pre-header text, email message, and sign-off into this tool to find out exactly what will trigger spam filters and send your emails to “The Upside Down.”

  1. Touchstone

What it checks is the effectiveness of the subject line, testing for segments, full reporting dashboards, and access to Touchstone’s database.

Price: Essential, $69; Expert, $99; Enterprise, $297

This is a high-end tool that probably works best for teams rather than just one person. Depending on the level you choose, you’ll get the ability to test subject lines, email reporting, segment testing, filter options, and technical support.

You can also look at the 21 billion emails in Touchstone’s database to see how your results compare.

  1. Make better by Moosend

What it looks for is the average open rate in the industry.

Price: Nothing

You can use Refine by Moosend to get more people to open your emails. This tool uses AI to show you your open rate score and compare it to the average for your industry. The best thing about Refine is that it will show you how to personalize your emails to get more opens, how to get the most out of your character count, and more.


What it checks: How well the copy works as a whole

Price: Nothing

This tool gets right to the point. Get an overall score for your subject line, find out where and why you lost points (e.g., “Does not have a sense of urgency,” -15 points), and learn how to make it better.

  1. ISnotSPAM

It looks for spam words and checks the sender’s ID.

Price: Nothing

Send an email to the address on their homepage, and you’ll get a full spam report back. This tool shows you which words or phrases in your email’s subject line or body will cause spam filters to go off. It also checks to make sure that your own ID is clean and suggests ways to fix any problems with spam that come up.

  1. The Headline Analyzer by CoSchedule

What it checks is how well the copy works as a whole, in terms of word balance, length analysis, keywords, type, and sentiment.

Price: Nothing

This tool was made to analyze blog and article headlines, but subject lines work just as well with it. Headline Analyzer gives you an overall score for your headline and gives you advice on structure, grammar, and where to put words.

This tool is the gold standard when it comes to testing headlines, so you should keep it handy.

  1. Hemingway App

What it checks: how easy it is to read.

Price: Nothing

Not a fan of books? Ernest Hemingway was a famous author who was known for writing in a simple way. In his books, there were no warm walks at sunset through spring blooms. Hemingway would have written, “We went for a walk. It was hot out. They were in full bloom.”

This app makes it easy to change the text of your email. Copy and paste your follow-up email into this tool to find out if you used passive voice, if you used too many adverbs, and if any of your sentences are hard to read.

  1. The Advanced Marketing Institute has made an Emotional Marketing Value Headline Analyzer.

Emotional Marketing Value (EMV) is what it measures.

Price: Nothing

Did you know that EMV words make up 20% of the English language? Find out if your headline appeals to the intellectual or emotional side of your prospect’s brain, and figure out which side you want to appeal to based on the goals and content of your emails.

  1. Adestra’s Email Subject Line Keyword Checker

What it checks is how often people open and click on keywords in the subject line.

Price: Nothing

This tool asks you to choose a business sector and type in your keyword, which is the main point of your subject line. For instance, if the subject line of my email is “Checking on the status of a contract,” I would type “contract” as my keyword.

In this case, the tool would tell me that the average open rate for emails with the word “contract” in the subject line is 0.35% less than average. Now that I know this, I might choose a different keyword for the subject line.

  1. Attrock’s Email Subject Line Analyzer

What it checks is the subject line’s readability, tone, length of words and characters, and how well it works overall.

Price: Nothing

Want to see if your subject line is interesting?

This tool will give you a score for your subject lines and give you tips on how to improve them to get more people to open and click on your emails. The Email Subject Line Analyzer is made to look at your subject line and give you a score based on how likely it is to get clicked on. It also helps you find the best length and emotional appeal for your subject line to get more clicks.

Subject line tester tools to check for spam in emails

Email spam checker tools look at your subject lines and email content to make sure they don’t get automatically marked as spam, which would make it harder for people to get your emails.

  1. This is not spam

It checks to see if your email gets picked up by common spam filters.

Price: Nothing

Is Not Spam has you send them your email draft. Within a few minutes, they send you a report that grades your subject line, email body copy, and HTML code for deliverability and gives you specific ways to improve it if it doesn’t make the cut.

  1. Test for Email Spam

It checks to see if your email gets picked up by common spam filters.

Price: $39/month and up

Email Spam Tester is similar to Is Not Spam, but it has paid features that you can share with a team and track over time. It grades all the parts of your email drafts and tells you how to improve them.

The most important part of your email is the subject line. In fact, 33% of people who get emails say they open them based on the subject line alone. Make the most of your prospect’s inbox and make sure your subject lines always catch their eye.

So these were some of the best subject line tester tools, to help you boost you email open rate!

Email Subject Line Tester Free Email Marketing Tool

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