We're on Mailchimp and considering Klaviyo. Is it worth the migration?

For most ecommerce merchants past a certain size, yes. The decision points are list size (if you are paying meaningful money to Mailchimp, the Klaviyo equivalent is often comparable in cost but materially more capable), the depth of your lifecycle programme (Klaviyo's flows are more sophisticated), and the maturity of your ecommerce event model. For very small or content-led operations, staying on Mailchimp is rational.

Possible but rare. The two platforms compete for the same customer record. We see merchants briefly run both during migration; permanent dual-tool deployments are uncommon and we typically recommend consolidating.

Does Patchworks integrate both natively?

Yes. Shopify-to-Klaviyo and Shopify-to-Mailchimp flows are both standard. Where the merchant is migrating, we route during the cutover so the rest of the integration estate is unaffected.

Which one integrates better with our ERP and customer-data layer?

Klaviyo. The customer-data model is closer to a CDP and integrates cleanly with NetSuite, Sage 200 or a separate CDP. Mailchimp can integrate but is less designed for that role; the customer record there tends to be downstream of the email programme rather than upstream of the broader stack.

Comparison · CRM and marketing

Klaviyo vs Mailchimp.
Where each one fits.

Klaviyo and Mailchimp are the two most-considered email marketing platforms in ecommerce. They start from different places: Klaviyo built the customer-data model around ecommerce events from day one; Mailchimp built a broader email tool and added ecommerce features over time. This page is the integration agency's read on where each one fits, and what each implies for the rest of the marketing stack.

The honest summary

Where Klaviyo wins. Where Mailchimp wins.

Klaviyo is the better fit when

Klaviyo is the stronger choice for ecommerce merchants who want deep behavioural segmentation, mature lifecycle flows triggered by ecommerce events, native Shopify integration depth, and a platform that scales with serious D2C revenue. The default in mid-market and enterprise D2C email programmes.

Mailchimp is the better fit when

Mailchimp is the stronger choice for very small businesses, content-led operations not centred on ecommerce, merchants who want a free or low-cost starting point, and businesses where the email programme is simpler newsletter-and-promotion rather than ecommerce-event-driven. Often the right answer for the first stage of a brand's lifecycle marketing, before the volume justifies Klaviyo's pricing.

What Klaviyo is

Klaviyo, fairly characterised.

Klaviyo is an ecommerce-native customer-data and email-and-SMS platform founded in 2012. The data model is built around customer profiles enriched by ecommerce events; the marketing tooling sits on top. Strong native Shopify integration, behavioural segmentation, lifecycle flows and predictive analytics.

What Mailchimp is

Mailchimp, fairly characterised.

Mailchimp is a broad email marketing platform founded in 2001 and now part of Intuit (acquired 2021). Originally a general-purpose email service, has added ecommerce features and a basic CRM over time. Strong brand recognition, simple onboarding, and a meaningful free tier. Less ecommerce-flow-shaped than Klaviyo.

By dimension

8 dimensions, side by side.

Both columns framed in the most generous light for their respective platforms. We integrate both; the comparison is about fit, not advocacy.

Ecommerce specialisation

Klaviyo
Ecommerce-native from day one. Customer profiles, event data, behavioural triggers and flows are designed around ecommerce purchase patterns.

Mailchimp
General-purpose email platform with ecommerce features added. Functional for ecommerce; less native than Klaviyo.
Shopify integration depth

Klaviyo
One of the strongest in the ecosystem. Customer, order and product events flow into Klaviyo with no configuration.

Mailchimp
Native Shopify integration exists and works for basic use cases. Less behavioural-event coverage than Klaviyo's connection.
Behavioural segmentation

Klaviyo
Strong. Browse abandoners, cart abandoners, post-purchase windows, RFM segments, predictive churn, AI-segment suggestions.

Mailchimp
Basic segmentation available; behavioural depth comparable to Klaviyo's only on higher tiers and less central to the product.
Lifecycle flows

Klaviyo
Genuinely deep. Multi-step flows with branching logic, time-based delays, A/B testing inside flows, and dynamic content per segment.

Mailchimp
Customer Journey Builder is functional; less rich than Klaviyo flows. Easier to start, less powerful to scale.
SMS

Klaviyo
Native SMS in supported markets, integrated with the same customer-data model and segments.

Mailchimp
SMS available as an add-on with separate workflow tooling. Less integrated than Klaviyo's native SMS.
Pricing

Klaviyo
Per active profile pricing. Costs scale with database size. Free tier exists but is small; serious users move to paid quickly.

Mailchimp
Tiered pricing with a substantial free tier. Cheapest at small scale; cost curve crosses Klaviyo's as the list and feature usage grow.
Talent and agency pool

Klaviyo
Specialist Klaviyo agencies and lifecycle marketers are widely available. Strong consultancy ecosystem.

Mailchimp
Very broad pool of general email marketers familiar with the platform. Less specialist depth than Klaviyo's.
Buyer profile

Klaviyo
Ecommerce growth and lifecycle teams. Buying centre usually CMO, head of growth or lifecycle marketing lead.

Mailchimp
Small business owners, content-led operations, marketers in non-ecommerce-centred businesses, and early-stage merchants pre-graduating to Klaviyo.

The integration agency's view

Whichever you pick, the integration is the variable.

We ship both. The pattern we see most often: brands start on Mailchimp, outgrow it as ecommerce volume scales and the lifecycle programme matures, and migrate to Klaviyo. Migration is a real engagement in itself: customer-data export, flow re-creation, segment reconstitution, deliverability warm-up. Patchworks handles the customer and order event piping cleanly into either platform. The choice between them is a marketing decision; we integrate either way.

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Questions

Common questions.

01 We're on Mailchimp and considering Klaviyo. Is it worth the migration?

For most ecommerce merchants past a certain size, yes. The decision points are list size (if you are paying meaningful money to Mailchimp, the Klaviyo equivalent is often comparable in cost but materially more capable), the depth of your lifecycle programme (Klaviyo's flows are more sophisticated), and the maturity of your ecommerce event model. For very small or content-led operations, staying on Mailchimp is rational.
02 Can we run both?

Possible but rare. The two platforms compete for the same customer record. We see merchants briefly run both during migration; permanent dual-tool deployments are uncommon and we typically recommend consolidating.
03 Does Patchworks integrate both natively?

Yes. Shopify-to-Klaviyo and Shopify-to-Mailchimp flows are both standard. Where the merchant is migrating, we route during the cutover so the rest of the integration estate is unaffected.
04 Which one integrates better with our ERP and customer-data layer?

Klaviyo. The customer-data model is closer to a CDP and integrates cleanly with NetSuite, Sage 200 or a separate CDP. Mailchimp can integrate but is less designed for that role; the customer record there tends to be downstream of the email programme rather than upstream of the broader stack.

Get in touch

Tell us what you’re trying to connect.

And what’s in the way. We will tell you whether we are the right people to do it. Drop us a line below, or open the chat in the corner of the screen.

Direct: contact@ecirql.com