7 Free AI Email Subject Line Generators in 2023

October 16, 2023

Subject lines are super important to boost open rates, and writing a perfect subject line can take a lot of effort and time. Lucky for you, there are a lot of artificial intelligence tools that you can use to generate AI email subject lines that are compelling and highly converting. In this guide, we will discuss some of the best AI email subject line generators.

Below is the list of free AI email subject lines created with AI-powered tools and how you can use them for your emails:

1. Mailmodo

Mailmodo AI subject line generator effortlessly creates captivating email subject lines at double the speed with Mailmodo’s campaign delivery, and supercharge your email open rates through our state-of-the-art AI subject line generator.

It helps to:

2. Encharge

The Encharge AI Email Subject Line Generator is a tool developed by Encharge that utilizes AI technology to generate compelling and unique subject lines for emails. It asks you about the following information to generate subject lines:

Here’s how I generated AI subject lines informing the users about the ongoing sale at Microsoft using Encharge. It generated these email subject lines:

image 523.png

This is a free-to-use tool that does not require any login.


The YAMM subject line generator is an easy-to-use, free, and no-login AI email generator that helps you write engaging email subject lines by just providing it the email body or even a phrase, and it generates 5 creative subject lines for you to use.

I used YAMM to generate subject lines for a new local shop offering discounts on their first visit. These were the results:

image 530.png

This tool is free to use.

4. Mailmunch

Mailmunch is a lead-generation email marketing platform. It provides an AI-powered email subject line generator that helps you write engaging email subject lines in seconds. You need to provide information like:

For a trial, I tried generating some AI email subject lines, reminding the customer of their subscription renewal. It helped me generate the following subject lines.

The tool is free to use.

5. Copy AI

Copy AI is an easy-to-use copy-generating tool that can help you write content quickly. You can use its AI chat feature and ask to write an email subject line about any given topic. It requires login to generate the subject lines.

image 525.png

In this case, I asked the AI chatbot to generate catchy subject lines about a checklist for mothers taking their babies out for the day. It helped me generate around 20 creative AI email subject lines to choose from:

The tool is free to use.

6. Wordkraft

Wordkraft is an AI tool that helps you write blog posts, research keywords, paraphrase, generate images, etc. It has a subject line generator that can generate email subject lines in a blink of an eye.

I generated a few email subject lines on Mailmodo’s interactive emails. It generated a few for the first time. As I wasn’t satisfied with the result, I tried to generate more, but it gave me almost the same results. It just changed a few words, which weren’t very useful.

image 531.png

This tool requires login to use and comes with a free trial with limited word usage.

7. Storylab

Storylab is an AI content creation tool that helps you create engaging and high-quality copy at scale. It has in-built tools like AI email subject line generators that can help you write creative email subject line copies.

I generated a sales email subject line using Storylab, and these were some results. Although it generated 4 email subject lines, I found them generic and not so engaging.

This tool gives you only 5 free runs. You need to upgrade to a paid plan for unlimited runs.

How to write an effective AI email subject line?

AI tools like email subject line generators can greatly help generate relevant, personalized, and catchy email subject lines. How they do it:

Many AI subject line generators can be used as an extension to your email software, while some are not, for those you need to copy and paste.


These tools can help generate effective AI email subject lines and test them before you hit send. Remember that all these tools are AI-powered, but AI can misunderstand and make mistakes, so always proofread your subject lines rather than copy and paste.

Related Articles

Powered By Mailmodo⚡️

Mailmodo is an email marketing tool, powered by AMP Emails, enabling users to create & send app-like interactive emails to improve conversions.

This allows your users to
- Book meetings
- Submit quizzes
- Take polls
- Share reviews
- Take NPS & CAST surveys

and much more all inside the email itself

Create your own AMP Emails

Got a query or want to submit a guest post? Let us know.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.