Email is considered the most formal way to communicate with the other party, so much so that it’s often a mere email that makes or breaks things. Be it university or job applications, formal communication between employees on different levels, or enquiring about something, writing a compelling email is a worthy skill to learn in today’s internet era. However, there’s one crucial thing everyone tends to miss out on every time they write an email – the subject line.
You may be an expert in writing intriguing email bodies, but let’s not forget that your email won’t even be opened if the subject line isn’t a head-turner. This is because coming up with a one-liner that’s catchy yet to the point isn’t everyone’s cup of tea by any means. The result? Long, irrelevant subject lines that can’t grab the reader’s attention or compel them to read your email. Fret not; AI is of great help in this regard, making the job a whole lot easier.
There’s no doubt AI has taken up more than half of the things on the internet, including most of the writing form, thanks to generative AI. But, if you had to exploit AI in one way possible, it should be by generating email subject lines using AI. Such tools are undoubtedly better at consistently coming up with catchy subject lines. And, since you’re not messing around with the body of the email, which is the primary part of an email, you are less likely to be called out for sending AI-generated emails. While there are a plethora of websites that can generate subject lines using AI, here are our top recommendations.
Best AI Subject Line Generator Tools
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Tool Name
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Key Features
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Free Tier
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Paid Tier (Starting At)
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|---|---|---|---|
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Mailmunch
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Uses ChatGPT-3; includes emojis; fast generation
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Yes
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$13.99/month
|
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Scalenut
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Context-aware; built-in editor; detailed inputs
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Yes
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$49/month
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|
Salesblink
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Tailored for cold emails; writes complete emails
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Yes
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$29/month
|
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Yet Another Mail Merge
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Ideal for daily/formal emails; powered by ChatGPT 3.5 Turbo
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Yes
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$3/month
|
|
Coschedule
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All-purpose generator; SEO improvement tools
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Yes
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$4/month or $29/year
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Omnisend
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Fast, simple; no account needed initially
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Yes
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$16/month
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Mailmeteor
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Completely free; no sign-up required
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Yes
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Free
|
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Popupsmart
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Set subject length; includes preheaders
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Yes
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$39/month
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The Media Ant
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Includes writing intent + tone; context-smart
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Yes
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Free
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RightBlogger
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Multilingual support; creativity control
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Yes
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$29/month
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Mailmunch – Best for quick, emoji-filled lines
Albeit not a dedicated email subject line generator, Mailmunch’s suite of tools includes a worthy email subject line generator that works great. Based on the tried-and-tested ChatGPT 3 technology, the subject line generation hardly takes longer than a few seconds and includes multiple iterations to choose from. As for the input, all you need to put in is what the email is about, the preferred tone of the subject line, and your company’s name.
In our testing, the generated subject lines were undoubtedly better than what we could have come up with. The subject lines included emojis, too, which is a nice addition to uplift the open rate of emails. While the tool is free, we are unsure of the number of prompts available in the free tier since Mailmunch has a paid tier that costs $13.99 per month. All in all, it’s an excellent tool for the job.
Scalenut – Best for context-rich results
Scalenut’s email subject line generator is among the better ones you’ll find. What we liked the most about Scalenut was its understanding aspect. In exchange for a marginally more detailed input about the details of the email, you get a subject line that’s pretty relevant to the body of the email. All you need to input is your company’s name, email description, and a few things about the email. The subject line generation was quick, too.
While we would have loved to, if Scalenut generated more than just two subject lines, you can always ask it to generate more results, provided you create an account and sign in. Doing so also grants you more detailed outputs, and you can also use the built-in editor to modify the responses. You can use the subject line generator for free, but to access other tools Scalenut offers, you need to purchase the premium plans, which start at $49 a month.
Salesblink – Best for cold email outreach
Salesblink specializes in generating cold email subject lines. That means if you are trying to reach out to someone to someone to sell a product or service, look no further than Salesblink. You must enter the prompts accordingly, including the product or service’s name alongside the target company. Salesblink is reasonably fast in producing results that are five in number and mostly appropriate. We ran into a couple of irrelevant results, which is something to keep in mind.
Since Salesblink can not only generate subject lines but also write cold emails entirely, you can, in fact, use the subject lines directly in a cold email then and there. We could generate the subject lines for free, but accessing additional functionalities required creating an account. Furthermore, Salesblink’s paid tier starts at $29 per month, which is a reasonable amount to pay.
Yet Another Mail Merge – Best for everyday formal emails
Yet Another Mail Merge is a fairly popular website for all things email and is very well-regarded for the same. It also has an AI subject line generator that works excellently. While most tools feel corporate-like, trying to create subject lines to increase open rates and sales, this one is better suited for not just that but also day-to-day emails. For instance, you need to set the tone of the subject line and enter the body of the email, but the latter can be replaced with a one-line prompt, which we did to test the tool.
Yet Another Mail Merge’s tool also generates five results that are pretty similar but entirely usable. As for the mastermind behind it, it’s the ChatGPT 3.5 Turbo, which works very well in this regard. The tool is free to use with limited functionalities in the free tier, but for full access and to use other tools offered, the paid tier starts at an affordable $3 a month.
Coschedule – Best for SEO-friendly subject lines
Coschedule is an all-in-one tool that can generate subject lines not only for emails but also for various other forms, such as blog posts, social media posts, advertisements, podcasts, and more. Since it lets you enter the target audience along with the topic and tone of the subject, you end up with a subject line tailored for the purpose and with the correct context. In our testing, Coschedule’s AI subject line generator worked admirably.
Each prompt generates four results by default, but you can always ask it to generate more if you need to. Furthermore, another attribute worth appreciating is that Coschedule allows you to fine-tune the results even more. So, you can ask it to generate similar results, make the existing results more compelling, replace keywords, and improve SEO rankings. While the tool is free, there’s a paid tier that costs $4 a month or $29 yearly.
Omnisend – Best for instant, no-fuss results
If you are looking for a no-nonsense subject generator to get things done quickly, Omnisend could be a great option. For starters, you don’t need to put anything other than what the subject line will be for. With just this information, Omnisend’s AI subject line generates ten worthy subject lines that you can copy and use in your emails. Although it took considerably longer to generate the results, we felt the wait was worthwhile because of the number and quality of results.
Omnisend’s AI subject line generator also makes good use of emojis, a welcome addition that makes readers more likely to open the email. Albeit unrelated, the website design deserves extra points for how good it is. The free tier should be perfectly fine for most users, but you can also subscribe to the paid tier that starts at $16 a month.
Mailmeteor – Best for free, no-login use
In the sea of paid AI email subject line generators, Mailmeteor’s subject line generator is among the few that are entirely free to use. Moreover, you don’t even need to create an account to access the feature, which is excellent if you want to use it occasionally. Like Omnisend, Mailmeteor doesn’t require any fancy prompt parameters, as you only need to enter the subject line description, which is usually a line at maximum. Then, Mailmeteor generates five results in a matter of seconds.
While the results weren’t as exciting as other tools mentioned in this list, they were more than suitable to be used in emails. The main reason for this was that the results didn’t include any punctuation or emojis to make them compelling, which is why we tip Mailmeteor’s AI email subject line generator best for occasional use, more so because it’s completely free to use.
Popupsmart – Best for length-controlled subjects
Popupsmart is another great website for generating email subject lines using AI. The process of generating one is relatively straightforward – enter a few lines about the email, select the tonality, set the subject length, and voila! We felt the option to set the length of the subject line was particularly helpful and one of a kind. Popupsmart doesn’t take much time to come up with five results alongside their preheaders for added convenience.
As for the results, the subject lines were quite creative and matched our preferred tone well. However, some of the results missed the mark when it came down to satisfying the requirements. Above all, the tool is free to use, but to access Popupsmart’s other email-related features, you will have to purchase the premium version, which starts at $39 a month. Thankfully, most users won’t need to go down that route since the free tier is good enough.
The Media Ant – Best for intent-based writing
Let’s be honest: setting the ‘tone’ settings doesn’t fully reflect our intentions of writing an email, which is something most AI email subject line generators overlook. Thus, apart from the writing tone, The Media Ant’s email subject line opts for an additional preset: the writing intent. As you would expect, it includes options such as driving curiosity, building trust, making it actionable, encouraging engagement, and a few more. And, for the most part, the feature does work wonders.
A great example of this is when we asked The Media Ant’s email subject line generator to generate a subject line for an upcoming college fest, and it generated results mentioning early bird registrations without us asking it to. The ‘encourage engagement’ intent we had initially set came in clutch. Other than a few stupidly long results, The Media Ant’s solution works wonders, and above all, it’s free to use!
RightBlogger – Best for multilingual subject lines
Last but not least, we have RightBlogger’s AI email subject line generator, which has the unique ability to generate multilingual email subject lines. It is an invaluable feature if you cater to customers or clients worldwide, as reaching out to them in their native language makes the email a lot more compelling to open. Other than that, RightBlogger’s email subject line generator gives the most control, including setting the creativity level of the subject line.
The result generation doesn’t take long, as RightBlogger comes up with ten unique results in no time. With the creativity set too high, the results came out creative enough to persuade the reader to open the email. Being able to give additional information to be included and setting the creativity level is the biggest perk of RightBlogger’s AI email subject line generator. While the tool is free, you only get a 1,500-word limit per month, which is relatively easy to exhaust. Instead, you can opt for the paid plan that starts at $29 a month.
Make Emails Compelling Using These AI Subject Line Generators
Getting the subject of an email right is a tough job, indeed. These AI email subject line generators make the work a piece of cake for anyone writing emails. Since AI is still nascent, you’ll have to give the subjects the needed human touch to make them more relevant and appealing. Moreover, choosing the correct email subject line generator is crucial to match your writing style and requirements.
Regardless, we wholeheartedly recommend Omnisend, Coschedule, Yet Another Mail Merge, and The Media Ant’s subject line generators for their ease of use and quality of generated subjects. If you want a free tool, Mailmeteor’s solution is a great one. While RightBlogger’s email subject line generator is best for multilingual use, other tools make sense if you use AI email subject line generators regularly or for commercial purposes.