I’m diving into MailerLite for my email campaigns and wondering how to best integrate popups to grow my subscriber list. I’ve seen tools like Popupsmart, Plum, and OptinMonster mentioned online, but I’d love to hear from folks who have actually used them.
What’s the best way to add a MailerLite popup to a site? Any tips, pitfalls, or platform-specific advice (like WordPress, Webflow, etc.)?
I’ve used Popupsmart for a while now, and it’s honestly the easiest integration I’ve tried. Here’s a step-by-step for you:
Here’s a simple step-by-step guide to help you integrate your MailerLite account with Popupsmart seamlessly.
To start the integration process, you need to have some default features
1. Sign up to your Popupsmart account and create a new campaign. Choose the best template to start your campaign. You need a popup with a form input element that you will decide on and make the integration.
Or, you can easily add a new form input element.
2. After adding a form input element, choose integration to add one and click add integration.
3. Choose MailerLite to connect.
4. You need to add a new MailerLite API or select from the dropdown. To add an API for the first time, click “Add new MailerLite API.”
5. After logging into your MailerLite account, click “Integrations” on the left sidebar of the page.
6. Choose “Use” in the MailerLite API section.
7. If you don’t have any API tokens to show, click “Generate new token” to have a new one.
8. After you name your token and agree to the Terms of Use, click “Create token.”
Don’t forget to confirm that you have read and understood the Terms of Use requirements, or you can’t create a token.
9. Copy the API token MailerLite has generated to paste it into your Popupsmart dashboard.
10. Turn back to your Popupsmart dashboard and “Save” after you name your collection and write your API Key.
11. After you complete the Setup, you need to choose your target group in the Details section.
Then, click “Next.”
12. Fill in the blanks and the dropdown options based on your needs, and click “Save.”
These fields may change according to the elements you include.
Form Field: It is used if you put form elements in your popup. If you don’t use any form element, you will see ‘No options’ on the dropdown.
System Field: You need to choose your option based on what you demand to get as data. For example, you can get the Browsers or Devices of the people who filled the popup.
API Field: You can transfer the data you sent to Popupsmart JS API with the integration again. You can get your data from your MailerLite account.
Static Field: You need to determine the specific data you want. For example, you may want to have sales or downgrades so that you can put them as ‘sales’ or ‘downgrades.’
Your MailerLite integration is ready, and you can change its status with the three-dot whenever needed.
Now you can get the most out of your email campaigns.
I initially struggled with matching the fields correctly but once I figured that out, it’s been smooth sailing. Highly recommend it!
Adding to what Michelle said:
Popupsmart works great even if you don’t use a CMS. Just embed their one-line JavaScript into your website’s header.
Here’s the best part: it doesn’t slow down your website. The script is just 97 KB, so super lightweight. If you’re a dev like me, you’ll appreciate the efficiency. 
Link to feature overview: Popupsmart Features
I used to think all popup tools were the same until I tried OptinMonster.
Advanced targeting (geo-location, scroll triggers, etc.)
Pre-built templates (over 700!)
A/B Testing features
Exit-intent popups that saved a lot of potential bounces for me
Create a campaign inside OptinMonster.
Go to Integrations tab.
Select MailerLite and paste your API.
Choose your MailerLite group.
Embed the campaign on your site (works with WordPress, Shopify, or plain HTML).
If you want super smart popups that convert like crazy—OptinMonster is a great choice.
If anyone’s looking for a super simple UI, I’d recommend Plum Popup.
No coding knowledge needed.
Drag-and-drop builder.
Fast JavaScript embed method.
You can personalize based on visitor segments.
I use Plum on my Shopify store, and it’s helped me convert window-shoppers into real subscribers. 
Just follow these 3 steps:
Design your popup.
Copy the JS code to your site’s header.
Watch the leads roll in.
I agree with Amari—Plum is fantastic for quick results. Plus, the types of popups they support are super versatile:
Exit-intent
Scroll-based
Slide-in
Fullscreen
Sticky corner popups
Each one fits a different scenario. I saw a 4.7% increase in my email signups just by switching from a regular modal to a scroll-based popup.
Sharing my strategy for growing my MailerLite list fast:
Offer something valuable (freebie, coupon, guide).
Use time-delayed or exit popups—not instant ones.
Segment based on behavior or source URL.
A/B test everything: colors, CTAs, triggers.
Also: don’t forget to make your mobile version look GOOD. I ruined my bounce rate for a week with an intrusive popup. Lesson learned!
I run a small e-commerce store focused on wellness, and I use Popupsmart.
For those who think popups slow down the website: they don’t, at least not with Popupsmart.
Also, I love the ability to use static fields. For example, I tag users who sign up for Pilates workshop reminders vs. product discount updates.
Such segmentation helps me send better emails from MailerLite.
Hey everyone! As someone from the Popupsmart team, I just want to say thanks for all the positive feedback.
Need support? Hit our live chat or send us an email anytime.
Happy popup building! 
Wow, this thread is packed with insights!
To summarize:
Use Popupsmart for simplicity and performance.
Try Plum if you want quick and beautiful popups.
Use OptinMonster if you want full customization and testing power.
All three work with MailerLite beautifully—just depends on your style and goals.
Let’s keep sharing tips and tools! 
