Writing great subject lines can feel like a guessing game. With Kit's AI subject line generator, you'll find the right words faster.
This feature looks at your Broadcast content and generates subject lines designed to grab attention and boost open rates.
With AI-powered subject line suggestions, you can focus on creating great emails while Kit helps you find the perfect words to get it opened.
NOTE: The AI subject line generator is available for Broadcasts at this time—not Sequences.
How the AI subject line generator works
First, write your Broadcast's content. This gives the AI subject line generator the context it needs to create relevant suggestions.
When you're ready, click the sparkle icon to the right of the subject line field to launch the AI subject line generator.
You'll see five subject line suggestions based on the email content you've written.
Click the subject line you like, followed by Use subject line to replace your email's existing subject line (if any) with it.
If you don't like the suggested subject lines, click Refresh suggestions to generate new ones.
NOTE: If the AI subject line generator doesn't have enough content to work with, you'll see a message when you try to run it:
Add more content to your email, and then try running the AI subject line generator again.
For creators on any of our paid plans, you've got unlimited access to use the AI subject line generator as many times as you'd like.
NOTE: If you're on our Free plan, you can explore this feature five times to see how it fits your workflow. Each set of five AI subject lines you generate counts as one of your five uses.
For instance, if you generate a set of five AI subject lines for today's email and then refresh for new subject lines, you've used the AI subject line generator twice.
Once you've experienced the value and used up your five turns, you can upgrade to a paid plan for unlimited access.
A/B test your AI subject lines
Our AI subject line generator works seamlessly with our A/B subject line test feature.
After you've generated five AI subject lines, click two or more of them that you like, followed by the Use subject line button. We'll automatically turn on an A/B test for your selected subject lines.
Over time, you'll learn the types of subject lines that drive the highest open rates for your audience.
Getting the most from AI subject lines
The secret to success with AI subject lines is treating them as a collaborative tool rather than a magic solution.
When you write your email content, you give the AI the context it needs to suggest relevant subject lines.
Don't be afraid to generate multiple sets of subject lines to explore different angles, and remember you can always modify the suggested subject lines to better match your voice.
This tool isn't here to replace your creativity—it's here to keep your creative flow uninterrupted.
Sometimes, the generated subject lines will be perfect as is, while other times they'll spark an idea that leads to something even better. The goal is to help you find the right words faster, so you can focus on what you do best: creating amazing content for your audience.