MailerLite Integrations: Strong for Creators, Weakest Where Stores Grow

MailerLite lists more than 100 integrations on its pricing page ^[2]. That is a smaller number than some rivals claim, and a more verifiable one, because the platform also publishes the developer surface behind it: a public API, webhooks and an MCP server for AI assistants. This page covers what connects, how well, and what the integrations cost or limit.

The headline finding is uneven quality. MailerLite's own phone app scores 4.7 from 1,106 ratings on the App Store ^[13]. Its own Shopify app scores 2.4 from 27 ^[15], and its own WordPress plugin 3.0 from 40 ^[14]. The integrations a business depends on most for list growth are the vendor's weakest surfaces.

What MailerLite connects to

The vendor's pages name these connections ^[9]:

• ChatGPT and Claude, through the MCP server.
• Shopify and WooCommerce, for store customers, products and purchase data.
• Stripe, for selling products, bookings and subscriptions.
• Mailchimp, through an importer for subscribers, fields and segments.
• Zapier, which connects MailerLite to more than 5,000 other apps.
• WordPress, for signup forms on a WordPress site.
• Canva, for designs in campaigns, blogs and websites.

The pricing page's comparison table adds Facebook Custom Audiences, webhooks, the MailerLite API and the MCP server ^[2]. Transactional email is a separate product, MailerSend, sold separately on every plan.

That covers the common needs of a creator or a small online business: a store, a payment processor, a website, an AI assistant and a bridge to everything else.

## Integrations by plan

Most integrations are available on every plan, including Free. The limits are on the developer surface.

	Free	Comfort	Power
100+ integrations	yes	yes	yes
MailerLite API	limited	yes	yes
MCP server	limited	yes	yes
Webhooks	limited	yes	yes
Shopify, WooCommerce, Stripe	yes	yes	yes

The key limit is sending. "Email sending via the API and MCP server is available on paid plans. On Free, API and MCP access is limited and doesn't include sending." ^[2] So a website that triggers an email through the API, or an assistant that sends a campaign through MCP, needs a paid plan.

On the free plan over 250 subscribers, integrations behave differently again. Connected e-commerce integrations keep syncing existing subscribers "but they will not add newly opted-in customers to your email list", and subscribers from the API or other integrations are not added ^[5]. To a store owner that looks like a broken integration. It is the plan limit.

Shopify: the weakest surface

MailerLite's own Shopify app, "MailerLite Email Automation", scores 2.4 from 27 reviews ^[15]. The distribution is 7 five-star, 3 three-star, 2 two-star and 15 one-star. More than half of the reviewers gave one star.

The complaints are specific. One merchant writes that "The tags are not working properly. Automations not sending due to tags not working." ^[15] Another describes "many glitches and server errors when trying to set up the pop-ups and automations" ^[15]. A third describes a discount that support "refused to honor it as it doesn't work with Shopify billing them" ^[15].

That last point is structural. Accounts that started through the Shopify integration can pay through Shopify ^[8], and the vendor's own GOLITE50 sale excluded "Users who installed the MailerLite Shopify app through the Shopify App Store" ^[18]. A Shopify-billed account sits slightly outside MailerLite's normal billing, and promotions may not reach it.

For comparison, Klaviyo's Shopify app scores 4.7 from 3,362 reviews in our Klaviyo measurement. For a store whose revenue depends on abandoned-cart and post-purchase flows, that difference matters more than any price gap.

## The other Shopify listing

Search the Shopify App Store for MailerLite and you may find a second listing, at the address ending in mailerlite-1, titled "MailerLite Email Marketing". It is not the vendor's.

The listing states: "This app is not currently available on the Shopify App Store. If you have support questions, contact Combidesk directly." ^[15] Combidesk is a third-party integration provider. Its listing is withdrawn.

We mention it because it is easy to mistake for the official app, and because a review or rating quoted from it would be attributed to the wrong company. When you evaluate the Shopify integration, use "MailerLite Email Automation", developed by MailerLite, launched in June 2022.

The same caution applies to any marketplace: check the developer name before reading reviews.

WordPress: forms on your site

The official plugin, "MailerLite – Signup forms (official)", connects MailerLite forms to a WordPress site. It scores 3.0 from 40 reviews on WordPress.org ^[14]. The distribution is 14 five-star, 4 four-star, 3 three-star, 4 two-star and 15 one-star, a mean of 2.95.

It is bimodal, like MailerLite's Trustpilot reviews: people either have no trouble or have a lot.

For most sites there is a simpler route. MailerLite's embedded forms come with an embed code you can paste into a WordPress block, a theme widget or a page builder. That avoids the plugin entirely, at the cost of managing the form in MailerLite rather than in WordPress.

Use the plugin if you want forms managed from the WordPress dashboard. Use the embed code if you want fewer moving parts. Either way, test on a staging site first and confirm that new subscribers land in the right group, because that group is what starts your welcome automation.

## Stripe: selling through MailerLite

Stripe is the integration that turns MailerLite into a shop. It powers digital products, bookings, paid newsletters and recurring subscriptions, and the paid newsletter page says it handles payments "from one-time purchases to weekly, yearly or custom subscriptions" in more than 135 currencies and payment methods ^[17].

MailerLite takes no commission on those sales; the features page puts it as selling "without paying us a commission" ^[10]. Stripe's own processing fees apply.

What the plans limit is the number of active products or bookings: one on Free, five on Comfort, unlimited on Power ^[3]. Over the limit, existing products keep selling but you cannot create, activate or edit products until you are back under it ^[4].

For a creator, this is the most valuable integration MailerLite has. The buyer, the purchase and the follow-up automation all live in one place, and nothing is lost between a store and an email tool.

Zapier and the long tail

Zapier is how MailerLite reaches the thousands of apps it does not integrate with directly. The vendor says the connection reaches "5,000+ apps" ^[9].

Typical uses:

• A new row in a spreadsheet adds a subscriber to a group.
• A new customer in an accounting or CRM tool adds them to a customers group.
• A form on another platform, such as a webinar tool, adds registrants.
• A new MailerLite subscriber creates a contact in a CRM.

Zapier is priced separately and counts tasks, so a busy integration can cost more in Zapier than in MailerLite. For high-volume syncs, the API or webhooks are usually cheaper.

One rule for every Zapier flow into MailerLite: send only people who opted in. Zapier makes it easy to pour contacts from any tool into a list, and the account review that follows is MailerLite's problem to raise and yours to solve.

## The API and webhooks

MailerLite publishes a developer API and webhooks, which is the foundation for any custom integration. Both are limited on Free, and sending through the API requires a paid plan ^[2].

The API covers what you would expect of an email platform: subscribers, groups, fields, campaigns, automations and forms. Webhooks notify another system when something happens in MailerLite, such as a new subscriber or an unsubscribe.

For a small business without a developer, the API matters indirectly. It is why many other tools can offer a MailerLite integration from their side, even where MailerLite does not list one.

For a business with a developer, the main design decision is which system owns consent. Let MailerLite own subscription status and unsubscribes, and have other systems read it. Two systems that both believe they own the unsubscribe list will, sooner or later, email someone who asked them not to.

AI assistants through MCP

MailerLite publishes an MCP server, so AI assistants such as Claude and ChatGPT can work directly in an account. The vendor's comparison page shows example requests: "Turn the blog post below into a 100 word email summary." "Show me everything about subscriber jane@example.com, including recent activity." "Find where subscribers are dropping off in my onboarding automation." ^[9]

On Free the MCP connection is limited and cannot send. On paid plans it can.

The pricing page describes Power as "Best for frequent senders, teams and AI agents." ^[2] That makes sense: an assistant that sends often will hit Comfort's sending cap faster than a person.

The terms reserve the right to "modify, suspend, or terminate AI-Powered Features, including access to the MCP or specific AI Agent integrations, without liability" ^[8]. Treat MCP as a convenience, not as infrastructure your business cannot run without.

## Transactional email is a separate product

Password resets, receipts and order confirmations are transactional email, and MailerLite does not send them from the marketing product. The pricing page lists transactional emails as "Try MailerSend" on every plan ^[2].

MailerSend is the same company's transactional service, with its own pricing. For a store, that means two products: MailerLite for campaigns and automations, and either MailerSend or the store's own system for transactional messages.

Shopify and WooCommerce send their own order emails, so most small stores do not need MailerSend. A custom application or a membership site usually does.

Keep the two apart. Sending transactional email through a marketing account mixes two kinds of consent and two kinds of deliverability, which is why most platforms in this category separate them.

The ratings at a glance

Surface	Developer	Rating	Reviews	One-star share
MailerLite Manager, App Store	MailerLite, Inc.	4.7	1,106	not published
Signup forms plugin, WordPress.org	MailerLite	3.0	40	15 of 40
Email Automation, Shopify App Store	MailerLite	2.4	27	15 of 27
Trustpilot, the company		4.1	3,362	23 of our 100

The phone app is a narrow surface, checking campaigns and subscribers on the move, and it scores highest. The two integrations that feed a list from a website or a store score lowest, and both have more one-star reviews than any other single rating. The company itself sits in between.

Read the table as a map of where problems concentrate, not as a verdict on the platform. A newsletter that grows through MailerLite's own forms never touches the two weak surfaces.

Testing an integration before you rely on it

Before an integration carries your list, test it end to end.

1. Use a test environment. A development store on Shopify, a staging site on WordPress.
2. Create a test subscriber with an address you control, through the integration, not by hand.
3. Check the group. Confirm the subscriber lands in the group that starts your automation.
4. Check the automation. Confirm the welcome or purchase sequence starts and every email arrives.
5. Check unsubscribes. Unsubscribe the test address and confirm the integration does not re-add it on the next sync.
6. Check the purchase data, for stores: that the order appears on the subscriber's profile.

Then check the plan limit. On Free, over 250 subscribers, integrations stop adding new subscribers while existing ones keep syncing ^[5]. Test what your integration does near that line, because the failure is silent.

What happens to integrations when you downgrade or cancel

Integrations do not switch off when a plan changes, but what they can do does.

Moving from a paid plan to Free limits the API, webhooks and the MCP server, and removes sending through them ^[2]. A website that triggers emails through the API stops sending them.

Over Free's limits, connected stores keep syncing existing subscribers but stop adding new ones ^[5]. Custom domains are removed on cancellation, and must be disconnected from landing pages before a cancellation can start ^[7]. Pages fall back to the default MailerLite address.

So before a downgrade, list every integration that sends, every page on a custom domain and every store connection, and decide what replaces each one.

How the integration picture compares

On the claim alone, MailerLite's 100+ integrations look modest beside Constant Contact's 300+. On verifiability, MailerLite is stronger. Its developer surface is published, its named integrations have their own pages, and its MCP server is documented. In our Constant Contact measurement, the integrations directory refused every automated reader.

On quality, the comparison depends on which integration you need. For an AI assistant, MailerLite is ahead of most rivals in our set, with a published MCP server. For Stripe-based selling, it is strong and commission-free. For Shopify, it is behind Klaviyo by a wide margin. For WordPress, it is average at best.

We score MailerLite 3.5 out of 5 on integrations. The score reflects a real developer surface and good coverage of creator tools, held down by the ratings of the two integrations that drive list growth for stores and websites.

## Choosing the right integration setup

A short guide by type of business.

A newsletter or creator: MailerLite forms on your site, Stripe for paid products, and the MCP connection if you draft with an assistant. You may need nothing else.

A WordPress site: embedded forms rather than the plugin, unless you need forms managed from WordPress. Test on staging.

A Shopify store: test the official app on a development store first, and read its most recent reviews. If abandoned-cart revenue is central, compare Klaviyo before committing.

A business with a CRM: Zapier for low volume, the API for high volume, with MailerLite owning consent.

A custom application: the API for marketing, and MailerSend or your own system for transactional email.

Whatever the setup, check what each integration does on the free plan above 250 subscribers. That is where most broken integration reports begin.