{"id":8060,"date":"2024-02-01T05:58:05","date_gmt":"2024-02-01T05:58:05","guid":{"rendered":"https:\/\/www.klenty.com\/blog\/?p=8060"},"modified":"2024-02-06T13:48:57","modified_gmt":"2024-02-06T13:48:57","slug":"email-subject-line-tester-tools","status":"publish","type":"post","link":"https:\/\/www.klenty.com\/blog\/email-subject-line-tester-tools\/","title":{"rendered":"10 Best Subject Line Tester Tools To Boost Email Open Rate"},"content":{"rendered":"\n<p><span style=\"font-weight: 400;\">Isn\u2019t it annoying when you have everything perfectly lined up to send out a mail, only to be stopped in your tracks by a lack of a great subject line? Given that subject lines decide whether a mail is opened or sent packed to the trash, it is essential that you get them right. <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">This simple line has so much magic to it, that if you get it right, you can knock your email campaigns out of the Hogwarts\u2019 park! <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Don\u2019t believe in magic? <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Then we will let these numbers speak: <\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">The word \u201cSales\u201d increases the open rate by 4% while \u201cSale\u201d decreases it by 2%<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Email subject lines that were personalized by including a name boosted open rates by 29.3%<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">68% of email recipients report email as spam based solely on the subject line<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Subject lines with&nbsp;<\/span><span style=\"font-weight: 400;\">1-5 words have a <\/span><i><span style=\"font-weight: 400;\">16%<\/span><\/i><span style=\"font-weight: 400;\"> open rate,&nbsp;<\/span><span style=\"font-weight: 400;\">6-10 words have a <\/span><i><span style=\"font-weight: 400;\">21%<\/span><\/i><span style=\"font-weight: 400;\"> open rate and&nbsp;<\/span><span style=\"font-weight: 400;\">11-15 words have a <\/span><i><span style=\"font-weight: 400;\">14%<\/span><\/i><span style=\"font-weight: 400;\"> open rate.<\/span><\/li>\n<\/ul>\n\n\n\n<p>Your subject line has to be simple yet intriguing, has to be packed with power words, should not be too long, etc. for your prospect to open the mail.<\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">That is quite a task, isn\u2019t it? To get the balance just right. <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">But let\u2019s say, you do. <\/span><\/p>\n\n\n\n<p><i><span style=\"font-weight: 400;\">The next question that comes up is, \u201cIs the subject line that is crafted good enough?\u201d<\/span><\/i><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">You are just a little unsure if it is good enough to send out to your prospects. Maybe, you wish you could send out a mail with that <a href=\"https:\/\/www.klenty.com\/blog\/cold-email-subject-lines-sales\/\" target=\"_blank\" rel=\"noreferrer noopener\">subject line<\/a>, check whether it works or not and travel back in time to change it. <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Well, unless you lived in a Richard Curtis movie, that is not possible.&nbsp;<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Enter, <strong>Subject Line Tester Tools<\/strong>.<\/span><\/p>\n\n\n\n<p>Subject Line Tester Tools can be used to analyze your email subject lines and give you feedback on how effective they are.&nbsp;<span style=\"font-weight: 400;\">Here are some of the best email subject line tester tools that will help make your email subject lines irresistible.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"best-email-subject-line-tester-tools-in-2024\"><strong>Best Email Subject Line Tester Tools in 2024<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"refine\">Refine<\/h3>\n\n\n\n<p>Refine by Moosend is an AI-powered email subject line tester tool that will show you the open rates of your subject line and compare it to industry standards. Refine\u2019s best feature is that it will provide you advice on how to increase open rates through personalization and make the most of your character limit.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"524\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/screenshot-of-landing-page-of-Refine-the-free-subject-line-tester.webp\" alt=\"screenshot of landing page of Refine, the free subject line tester\" class=\"wp-image-8061\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/screenshot-of-landing-page-of-Refine-the-free-subject-line-tester.webp 1024w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/screenshot-of-landing-page-of-Refine-the-free-subject-line-tester-300x154.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/screenshot-of-landing-page-of-Refine-the-free-subject-line-tester-768x393.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/screenshot-of-landing-page-of-Refine-the-free-subject-line-tester-755x386.webp 755w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li><strong>What the tool does:<\/strong> Analyze and compare the rating of your subject line to the industry standard.<\/li>\n\n\n\n<li><strong>How to test:<\/strong> Choose your industry first, then type your subject line into the tab.<\/li>\n\n\n\n<li><strong>Price:<\/strong> Free<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"mailmeteor\">Mailmeteor<\/h3>\n\n\n\n<p>Mailmeteor is one of the fastest subject line tester tools which would give you a score based on checks made at multiple levels: length, number of words, number of topic mark and exclamation points, presence of emojis or spam words. Its best part is that it provides alternative subject lines using GPT-3.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"399\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Mailmeteor.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - Mailmeteor\" class=\"wp-image-8062\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Mailmeteor.webp 1024w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Mailmeteor-300x117.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Mailmeteor-768x299.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Mailmeteor-755x294.webp 755w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>What the tool does:<\/strong> After analyzing your subject line, Mailmeteor gives it a score.<\/li>\n\n\n\n<li><strong>How to test:<\/strong> <span style=\"font-weight: 400;\">Enter your subject line in the tab<\/span><\/li>\n\n\n\n<li><strong>Price:<\/strong> Free<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"test-subject\">Test Subject<\/h3>\n\n\n\n<p>Ever wondered how the mail&nbsp;you send is displayed in your prospect\u2019s phone? In case you hadn\u2019t realized, it varies from device to device. This tool shows you how your subject line is displayed on different mobile phones.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"687\" height=\"651\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Test-Subject.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - Test Subject\" class=\"wp-image-8063\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Test-Subject.webp 687w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Test-Subject-300x284.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Test-Subject-485x460.webp 485w\" sizes=\"auto, (max-width: 687px) 100vw, 687px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does:<\/b><span style=\"font-weight: 400;\"> Show how your mail is displayed on different mobile phones<\/span><\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Enter your subject line in the tab<\/span><\/li>\n\n\n\n<li><b>Price:<\/b> F<span style=\"font-weight: 400;\">REE<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"email-subject-line-grader\">Email Subject Line Grader<\/h3>\n\n\n\n<p><span style=\"font-weight: 400;\">This is one of the simplest Subject line tester tools out there. The tool analyzes your subject line based on many factors to determine how captivating it is in the eyes of your prospects. All you have to do is enter your line in the tab and it gives its opinion based on the type of subject line along with a rough assessment based on your subject line\u2019s:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Word mixture and Balance<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Word count<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Character count<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Power words<\/span><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"798\" height=\"666\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-subject-line-grader.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - Email subject line grader\" class=\"wp-image-8064\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-subject-line-grader.webp 798w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-subject-line-grader-300x250.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-subject-line-grader-768x641.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-subject-line-grader-551x460.webp 551w\" sizes=\"auto, (max-width: 798px) 100vw, 798px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does: <\/b><span style=\"font-weight: 400;\">Give a score after assessing your subject line<\/span><\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Enter your subject line in the tab<\/span><\/li>\n\n\n\n<li><b>Price: <\/b><span style=\"font-weight: 400;\">FREE<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"subjectline-com\">SubjectLine.com<\/h3>\n\n\n\n<p><span style=\"font-weight: 400;\">Subjectline.com is Mr. No-nonsense when it comes to testing email subject lines. <\/span><span style=\"font-weight: 400;\">This tool helps marketers to test any subject line. The results are based on over a billion email messages that have been sent and tracked via subjectline.com&#8217;s partners and clients. It evaluates filtering and deliverability issues, if any, as well as marketing and performance-related concerns.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"466\" height=\"358\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2024\/02\/Subjectline.com_.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - SubjectLine.com\" class=\"wp-image-19022\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2024\/02\/Subjectline.com_.webp 466w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2024\/02\/Subjectline.com_-300x230.webp 300w\" sizes=\"auto, (max-width: 466px) 100vw, 466px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does: <\/b><span style=\"font-weight: 400;\">A thorough assessment of the subject line<\/span><\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Enter your details and fill out the form to view the results<\/span><\/li>\n\n\n\n<li><b>Price: <\/b><span style=\"font-weight: 400;\">FREE<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"email-subject-line-tester\">Email Subject Line Tester<\/h3>\n\n\n\n<p>Email Subject Line Tester is a powerful and easy-to-use tool that helps you check if your subject lines contain words that are considered spammy.<\/p>\n\n\n\n<p>The tool checks for different parameters, such as reading level, sentiment, and personalization, and gives you a score out of 100 based on which you can decide to use or change the line.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"909\" height=\"371\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-Subject-Line-Tester.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - Email Subject Line Tester\" class=\"wp-image-8065\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-Subject-Line-Tester.webp 909w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-Subject-Line-Tester-300x122.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-Subject-Line-Tester-768x313.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Email-Subject-Line-Tester-755x308.webp 755w\" sizes=\"auto, (max-width: 909px) 100vw, 909px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does: <\/b>Analyzes your subject line to see if there are spam words<\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Enter the subject line and simply click &#8216;Test Subject Now&#8217;<\/span><\/li>\n\n\n\n<li><b>Price: <\/b><span style=\"font-weight: 400;\">FREE<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"isnotspam\">IsnotSPAM<\/h3>\n\n\n\n<p><span style=\"font-weight: 400;\">This tool ensures that your subject lines do not contain any trigger words that might make it get marked as spam by one of those filters used by your prospects After spending so much time and efforts on your mail, the last thing you want is for it to be tossed down the trash because the spam filters assumed your mail to be spam.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1020\" height=\"311\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-IsnotSPAM.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - IsnotSPAM\" class=\"wp-image-8066\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-IsnotSPAM.webp 1020w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-IsnotSPAM-300x91.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-IsnotSPAM-768x234.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-IsnotSPAM-755x230.webp 755w\" sizes=\"auto, (max-width: 1020px) 100vw, 1020px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does: <\/b><span style=\"font-weight: 400;\">Analyzes subject lines to ensure it is spam free<\/span><\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Send a mail of your content to the mail address mentioned to get a detailed report of your content.<\/span><\/li>\n\n\n\n<li><b>Price: <\/b><span style=\"font-weight: 400;\">FREE<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"emv-analyzer\">EMV Analyzer<\/h3>\n\n\n\n<p><span style=\"font-weight: 400;\">English language has about 20% of words that can be classified as Emotional Marketing Value (EMV) Words. These are words that invoke an intellectual or empathetic or spiritual side of the readers. This tool gives an analysis of your subject line based on the EMV.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"329\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-EMV-Analyzer-1024x329.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - EMV Analyzer\" class=\"wp-image-8067\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-EMV-Analyzer-1024x329.webp 1024w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-EMV-Analyzer-300x96.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-EMV-Analyzer-768x247.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-EMV-Analyzer-755x242.webp 755w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-EMV-Analyzer.webp 1090w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does: <\/b><span style=\"font-weight: 400;\">Analyze your subject line based on its Emotional Marketing Value<\/span><\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Enter your subject line in the tab<\/span><\/li>\n\n\n\n<li><b>Price: <\/b><span style=\"font-weight: 400;\">FREE<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"hemingway-app\">Hemingway App<\/h3>\n\n\n\n<p><span style=\"font-weight: 400;\">Ernest Hemingway was known for his straightforward writing style. <\/span><span style=\"font-weight: 400;\">&#8220;The lady doth protest too much&#8221; in a Shakespearean play would become \u201cShe is opposing it strongly\u201d in an Ernest Hemingway novel. The tool does exactly that. It analyzes how an intermediate Homosapien comprehends your subject line (Can an average Joe understand what you are saying)<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"534\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Hemingway-App-1024x534.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - Hemingway App\" class=\"wp-image-8068\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Hemingway-App-1024x534.webp 1024w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Hemingway-App-300x156.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Hemingway-App-768x400.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Hemingway-App-755x394.webp 755w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Hemingway-App.webp 1061w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does: <\/b><span style=\"font-weight: 400;\">Points out the complexities in your text<\/span><\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Copy-paste your content into the tab<\/span><\/li>\n\n\n\n<li><b>Price: <\/b><span style=\"font-weight: 400;\">FREE<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"headline-analyzer\">Headline Analyzer<\/h3>\n\n\n\n<p><span style=\"font-weight: 400;\">The Headline Analyzer tool by Coschedule is one of the must-have tools when it comes to subject line testing. The tool while it was built for headlines of articles and blogs, it works just as fine for our purpose of testing email subject lines. It gives an overall assessment along with tips on how the article can be improved in terms of structure, grammar, and word placement, making it a handy tool to get subject lines right.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"296\" src=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Headline-Analyzer.webp\" alt=\"Screenshot of Email Subject Line Tester Tools - Headline Analyzer\" class=\"wp-image-8069\" srcset=\"https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Headline-Analyzer.webp 1024w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Headline-Analyzer-300x87.webp 300w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Headline-Analyzer-768x222.webp 768w, https:\/\/www.klenty.com\/blog\/wp-content\/uploads\/2023\/09\/Screenshot-of-Email-Subject-Line-Tester-Tools-Headline-Analyzer-755x218.webp 755w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>What the tool does: <\/b><span style=\"font-weight: 400;\">Analyzes headlines <\/span><\/li>\n\n\n\n<li><b>How to test: <\/b><span style=\"font-weight: 400;\">Enter your subject line, and fill in the sign-up form to get your results<\/span><\/li>\n\n\n\n<li><b>Price: <\/b><span style=\"font-weight: 400;\">FREE<\/span><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-black-color has-text-color\" id=\"conclusion\" style=\"font-size:30px\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>Well, now you know what we know. Isn\u2019t technology just splendid? A tool to test this, an app to improve that. Hope you use these tools to create attention-capturing subject lines for your cold emails. And do let us know about your experience in the comments below. To conclude, we&#8217;d like to leave you with a few ground rules you should keep in mind when writing subject lines:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Don\u2019t make promises you can\u2019t keep<\/li>\n\n\n\n<li>Don\u2019t write something solely to get their attention<\/li>\n\n\n\n<li>Don\u2019t talk about something in the subject line and then write something else inside the email<\/li>\n\n\n\n<li>Shed the formality<\/li>\n\n\n\n<li>In pursuit of being clever, don\u2019t be vague<\/li>\n<\/ul>\n\n\n\n<p>That\u2019s all folks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Isn\u2019t it annoying when you have everything perfectly lined up to send out a mail, only to be stopped in your tracks by a lack of a great subject line? Given that subject lines decide whether a mail is opened or sent packed to the trash, it is essential that you get them right. This [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"rank_math_title":"10 Best Subject Line Tester Tools to Boost Email Open Rate","rank_math_description":"Here is a list of best subject line tester tools that work in 2024. Use these tools to craft attractive subject lines and boost your email open rates.","footnotes":""},"categories":[27],"tags":[],"class_list":["post-8060","post","type-post","status-publish","format-standard","hentry","category-cold-email"],"_links":{"self":[{"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/posts\/8060","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/comments?post=8060"}],"version-history":[{"count":15,"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/posts\/8060\/revisions"}],"predecessor-version":[{"id":19030,"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/posts\/8060\/revisions\/19030"}],"wp:attachment":[{"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/media?parent=8060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/categories?post=8060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.klenty.com\/blog\/wp-json\/wp\/v2\/tags?post=8060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}