The Klaviyo vs Mailchimp debate in ecommerce circles has been ongoing for years, but the landscape has shifted significantly. Mailchimp was acquired by Intuit in 2021 and has evolved its product strategy. Klaviyo went public in 2023 and has doubled down on its ecommerce-first approach. Both platforms continue to develop, and a comparison from even two years ago may not reflect the current state of either product.
This comparison focuses specifically on ecommerce use cases. Mailchimp is a versatile email marketing platform that serves businesses of all types. Klaviyo is purpose-built for ecommerce. If your business is primarily ecommerce, this distinction matters more than any individual feature comparison. For a broader look at the two platforms, see our earlier Mailchimp vs Klaviyo comparison.
I have managed campaigns and flows on both platforms for UK ecommerce brands and seen the revenue impact firsthand. This guide reflects that hands-on experience.
Email as a revenue channel
The fundamental question is not which platform sends better emails — both can send perfectly good emails. The question is which platform treats email as a revenue channel rather than a communications channel.
For ecommerce brands, email should generate 25-40% of total revenue through a combination of automated flows (abandoned cart, welcome series, post-purchase, browse abandonment, win-back) and targeted campaigns. The platform's ability to segment audiences based on purchase behaviour, predict future purchasing patterns, and attribute revenue to specific emails determines how effectively it serves as a revenue engine.
This framing is important because it shifts the evaluation from feature checklists to commercial outcomes. A platform that costs more but generates more revenue per subscriber is the better investment. Our guide to the seven essential Klaviyo flows illustrates how automated email drives consistent revenue.
Platform overview
Klaviyo: ecommerce-first
Klaviyo was founded in 2012 with a specific mission: build a marketing platform for ecommerce businesses that treats customer data as the foundation for everything. The platform integrates deeply with Shopify, WooCommerce, BigCommerce, and other ecommerce platforms, pulling in real-time event data that powers segmentation, automation, and personalisation.
Klaviyo's core strength is its data model. Every customer interaction — page views, product views, cart additions, purchases, refunds, subscription changes — is tracked as an event and available for segmentation and automation triggers. This granularity enables the kind of targeted, behaviour-driven marketing that moves the revenue needle.
Mailchimp: general-purpose with ecommerce capabilities
Mailchimp was founded in 2001 and grew into one of the most recognised email marketing brands globally. It serves millions of businesses across every industry, from local shops and non-profits to ecommerce and SaaS. After its acquisition by Intuit, Mailchimp has integrated with QuickBooks and expanded its marketing automation capabilities.
Mailchimp's strength is accessibility. The platform is intuitive, well-documented, and offers a free plan that makes it easy to get started. Its email builder is polished, the template library is extensive, and the learning curve is gentle. For businesses where email marketing is one of many tasks handled by a small team, Mailchimp's simplicity is a genuine advantage.
Shopify integration
Klaviyo has one of the deepest Shopify integrations of any marketing platform. The connection is real-time and bi-directional. Klaviyo receives purchase events, customer data, product information, collection data, discount code usage, and refund events from Shopify. This data powers everything from abandoned cart flows to predictive lifetime value calculations.
Klaviyo also pushes data back to Shopify, enabling personalised on-site experiences and customer tagging. The integration supports Shopify's native customer consent model, which is important for UK GDPR compliance.
Mailchimp restored its Shopify integration after a notable period where the two platforms were disconnected (2019-2022). The current integration syncs customer data, purchase history, and product catalogue information. It is functional but not as deep or real-time as Klaviyo's. Browse abandonment events, for example, require additional configuration on Mailchimp, whereas Klaviyo tracks them natively.
For brands where Klaviyo email marketing is central to revenue strategy, the integration depth with Shopify is a significant factor.
Segmentation and data
Segmentation is where Klaviyo's ecommerce-first architecture creates the biggest practical advantage.
Klaviyo's segmentation allows you to build segments based on virtually any combination of purchase behaviour, email engagement, website activity, predicted data, and custom properties. Examples include: customers who purchased Product A but not Product B, customers whose predicted next order date is within the next 7 days, customers who have viewed a specific collection page more than three times without purchasing, or customers whose historical CLV is above £500 and who have not purchased in the last 60 days.
These segments update in real time, meaning customers enter and exit segments automatically as their behaviour changes. This dynamic segmentation is powerful for both automated flows and targeted campaigns.
Mailchimp's segmentation supports basic and advanced segmentation based on demographics, email engagement, purchase history, and campaign activity. The segmentation builder is capable but does not match Klaviyo's granularity for ecommerce-specific conditions. Behavioural triggers like browse abandonment and predictive data points are either unavailable or require premium plans.
For a deeper understanding of how segmentation drives revenue, see our guide on Klaviyo management costs and what professional management delivers.
Automation and flows
Klaviyo flows are the platform's most powerful feature for ecommerce revenue. The flow builder supports complex branching logic with conditional splits based on any data point in Klaviyo. You can create flows that behave differently for first-time buyers versus repeat customers, high-value customers versus low-value, or customers who purchased from specific product categories.
Klaviyo includes pre-built flow templates for every core ecommerce automation: welcome series, abandoned cart, browse abandonment, post-purchase, win-back, sunset, cross-sell, and more. These templates are well-designed and provide a strong starting point that can be customised extensively.
Mailchimp's Customer Journeys provide automation capabilities that cover basic ecommerce workflows. You can create automated sequences triggered by sign-up, purchase, abandoned cart, and other events. The journey builder is visual and intuitive, making it easy to create simple workflows.
The gap becomes apparent in complexity. Klaviyo's flows support deeper conditional logic, more trigger types, and more sophisticated branching than Mailchimp's Customer Journeys. For ecommerce brands that want to build multi-step, behaviour-driven automations with 10-20 emails and multiple decision points, Klaviyo provides significantly more capability.
Revenue attribution
Understanding which emails drive revenue is essential for optimising your email programme.
Klaviyo provides granular revenue attribution at the flow level, campaign level, and individual email level. You can see exactly how much revenue each email generated, including first-touch and last-touch attribution models. This data makes it straightforward to identify which flows are performing well and which need optimisation.
Mailchimp provides basic revenue tracking for ecommerce-connected accounts, showing revenue generated by campaigns and automations. The reporting is functional but less granular than Klaviyo's, particularly for attributing revenue across complex multi-touch customer journeys.
Revenue attribution is not just a reporting nicety — it is the foundation for data-driven optimisation. When you can see that your abandoned cart flow generates £15 per recipient but your browse abandonment flow generates only £2, you know where to focus your optimisation efforts.
Templates and design
Mailchimp has a slight edge in template design. The email builder is polished, the template library is extensive, and the design tools are intuitive. For brands without a designer, Mailchimp makes it easier to create professional-looking emails out of the box.
Klaviyo's email builder has improved significantly and now offers a drag-and-drop editor that is comparable to Mailchimp's. Klaviyo's template library includes ecommerce-specific templates that work well with product blocks, dynamic content, and conditional sections. For ecommerce emails specifically, Klaviyo's templates are more purpose-built.
Both platforms support custom HTML templates, which means brands with a designer or developer can create fully custom email designs on either platform.
SMS marketing
Klaviyo includes native SMS marketing as part of its platform, with support for UK phone numbers and compliance with UK SMS marketing regulations. SMS can be integrated into the same flows and segments used for email, enabling coordinated multi-channel campaigns. The SMS and email channels share the same customer data and segmentation engine, which simplifies multi-channel marketing.
Mailchimp does not currently offer native SMS marketing. Brands that want to add SMS to their Mailchimp-based marketing stack need to use a third-party platform, which means managing separate tools, separate data, and separate workflows.
For brands where SMS is part of their marketing strategy (and it should be for most DTC brands), Klaviyo's integrated SMS is a significant advantage.
Pricing comparison
Mailchimp pricing: The free plan supports up to 500 contacts with limited features. The Essentials plan starts at approximately £10/month. The Standard plan (required for most automation features) starts at approximately £14/month. The Premium plan starts at approximately £275/month. Pricing scales with contact list size.
Klaviyo pricing: The free plan supports up to 250 contacts with full feature access. Paid plans start at $20/month for 251-500 contacts and scale with list size. A 10,000-contact list costs approximately $150/month. A 25,000-contact list costs approximately $400/month.
Mailchimp is generally cheaper at smaller list sizes. Klaviyo becomes more cost-competitive at larger list sizes, and the revenue it typically generates through better segmentation and automation means the ROI often favours Klaviyo despite the higher price. Many of our clients see Klaviyo generating 30-50x their monthly platform cost in email-attributed revenue.
Deliverability
Both platforms maintain strong deliverability infrastructure, and both have dedicated deliverability teams that monitor and maintain sender reputation.
Klaviyo has an advantage in that its customer base is entirely ecommerce, which means the shared IP pools are populated by legitimate ecommerce senders. Mailchimp's broader customer base means its shared IPs serve a wider variety of sender types, which can occasionally impact deliverability.
Both platforms offer dedicated IP addresses for high-volume senders, custom authentication (DKIM, SPF, DMARC), and deliverability monitoring tools. For UK brands, both platforms support proper sender authentication that is important for maintaining inbox placement with UK ISPs and email providers.
Predictive analytics
Klaviyo offers predictive analytics powered by its ecommerce data model. This includes predicted customer lifetime value, predicted next order date, predicted gender, and predicted spending tier. These predictions are available as segmentation conditions, meaning you can target campaigns to customers who are predicted to purchase within the next 7 days, or create flows that trigger based on changes in predicted lifetime value.
Mailchimp offers purchase likelihood predictions and customer lifetime value estimates on its Standard plan and above, but the predictions are less granular and less deeply integrated into the segmentation and automation tools.
Predictive analytics transform email from reactive to proactive. Instead of waiting for customers to abandon a cart or go dormant, you can anticipate behaviour and intervene before it happens. This capability is unique to platforms with deep ecommerce data integration.
The verdict
For ecommerce brands, particularly those on Shopify, Klaviyo is the stronger choice. Its ecommerce-first architecture, deeper Shopify integration, more powerful segmentation, superior automation capabilities, integrated SMS, and predictive analytics create a platform that treats email as a genuine revenue channel.
Choose Klaviyo if:
- Ecommerce is your core business and email is a primary revenue channel
- You want deep Shopify integration with real-time event data
- Behavioural segmentation and predictive analytics are important to your strategy
- You need complex automated flows with conditional logic
- SMS marketing is part of your communication mix
- Revenue attribution and data-driven optimisation are priorities
Choose Mailchimp if:
- You are a very small business with a limited budget and simple email needs
- Ease of use and a gentle learning curve are top priorities
- Your business is not primarily ecommerce (content, services, non-profit)
- You need basic email marketing without complex automation
- You value Mailchimp's broader marketing tools (social posting, website builder, postcards)
- Your email programme is primarily campaign-based rather than flow-based
The honest truth is that for serious ecommerce email marketing, Klaviyo delivers more revenue. The higher price is an investment that typically pays for itself many times over. For non-ecommerce businesses or very early-stage brands with minimal email needs, Mailchimp remains a perfectly capable choice.
If you are considering switching from Mailchimp to Klaviyo, or want to improve the revenue performance of your existing email programme, get in touch. We provide Klaviyo email marketing services that focus on driving measurable revenue growth.