Klaviyo vs Omnisend vs Mailchimp for Shopify: Which Should You Use?

Short answer: if email and SMS are meant to be a serious revenue channel for your Shopify store, Klaviyo is usually the strongest fit. If you want something quicker to learn that still covers email, SMS and push, Omnisend is a good pick. If you already run on Mailchimp and your needs are simple, you can stay, because it connects to Shopify directly again.

A fair warning before I go on: I work mostly in Klaviyo, so I know it best. Every platform claim below is checked against each vendor's own pages, listed at the end, and I say plainly where the other two are the better choice.

Shopify integration: where each one stands now

Klaviyo. Klaviyo's help center says the integration first syncs the last 90 days of Shopify data, then runs a full historical sync, and after that new data arrives in real time. It tracks the events ecommerce flows need: checkout started, placed order, fulfilled, cancelled and refunded orders, plus onsite activity such as viewed product and added to cart. Email and SMS consent from Shopify checkout syncs too.

Omnisend. Omnisend has its own app in the Shopify App Store that syncs contacts, orders and products, and its listing notes that it works with Shopify Checkout and Shopify Flow.

Mailchimp. Many store owners still believe Mailchimp and Shopify do not connect. That was true for a while, when stores needed a third-party connector. Mailchimp's newsroom announced a direct integration again on October 26, 2021, and the current Shopify app is published by Intuit Mailchimp itself. Its help docs say customer, order and tag data sync in real time, with discount codes syncing every few hours. If you run several storefronts, note that each store needs its own connection and audience.

Ecommerce data and segmentation

This is where Klaviyo pulls ahead. Every Shopify event lands on the customer profile and can be used as a segment condition or a flow filter, and you can combine them freely. Klaviyo also adds predictive fields such as expected next order date, lifetime value and churn risk, which are useful for win-back and VIP targeting.

Omnisend offers dynamic segments based on purchases, opens, clicks and location, and it has an AI assistant that builds a segment from a plain description. For most small stores that covers the segments that matter.

Mailchimp began as a general email tool, and you can still feel that in how audiences and tags work. It has been closing the gap: its February 2026 release added more ecommerce triggers, a site tracking pixel and connections to review platforms for building segments like high-value or at-risk buyers. It is better than its reputation, though ecommerce segmentation still takes more steps there.

Flows, SMS and forms

All three cover the core automations: welcome, abandoned cart, browse abandonment, post-purchase and win-back.

• Klaviyo gives you the most control inside a flow: conditional splits, trigger filters and branching on almost any profile or event data.
• Omnisend is the quickest to get live. Its prebuilt workflows are solid and you can put email, SMS and web push in the same automation in one view.
• Mailchimp covers abandoned cart, win-back and back-in-stock through its Shopify app. How much automation you get depends on your plan tier, so check that before you commit.

For SMS, Klaviyo runs it in the same account as email, alongside WhatsApp and mobile push. Omnisend's support docs say that for new accounts SMS is a separate add-on available on its top tier. Mailchimp sells SMS as an add-on for paid plans in select markets, so confirm your country is covered. On all three, SMS cost depends on the recipient's country.

For forms, all three include pop-ups, so you may not need a separate pop-up app. Klaviyo adds fly-outs, embedded and multi-step forms, while Omnisend and Mailchimp add landing pages.

Reporting and ease of use

Klaviyo's reporting covers email, SMS and push together, and its benchmarks compare your numbers to 100 peer brands, according to its features page. That helps you tell whether a flow is underperforming or simply normal for your category.

Omnisend's dashboard breaks sales down by email, SMS and push and is easy to read at a glance. Mailchimp's 2026 release introduced a combined dashboard for email, SMS, automation and ecommerce events.

On ease of use, my honest ranking is the reverse of the power ranking. Omnisend and Mailchimp are easier to pick up on day one. Klaviyo asks more of you, and it pays that back only if someone actually uses the depth.

How the pricing models differ

I am not going to quote prices because they change often. What matters more is what each platform counts, since that decides how your bill grows.

• Klaviyo bills on active profiles, meaning any profile you could email regardless of consent, together with email send volume. Suppressed profiles are not billed. See the Klaviyo pricing page.
• Omnisend bills on billable contacts, which covers subscribers and non-subscribers but not unsubscribed contacts. The middle tier has an email allowance tied to your contact count and the top tier removes it. See the Omnisend pricing page.
• Mailchimp bills on contacts with a monthly send limit per tier, and overages are charged automatically. Its help docs say unsubscribed and non-subscribed contacts count toward your limit unless you archive them. See the Mailchimp pricing page.

At the same list size Klaviyo often comes out as the most expensive of the three, so run your real numbers through each calculator.

Who should pick which

• Pick Klaviyo if you want email and SMS to be a main revenue channel, you have enough order volume for segmentation to matter, and you or someone you hire will build and maintain proper flows.
• Pick Omnisend if you are a small or mid-sized store, you want email, SMS and push in one place, and you value fast setup over fine-grained control.
• Pick Mailchimp if you already use it and it works, your store is part of a wider business with non-ecommerce email needs, or your program is mainly newsletters plus a few core automations.

If you are on Mailchimp or Omnisend and it is doing the job, you do not have to move. Migrate when you hit a real limit, not because a comparison post told you to.

What to do next

If you would like a second opinion on which platform fits your store, or help moving to Klaviyo without losing your flows and consent data, book a call and I will walk through it with you.