Klaviyo if you're serious about revenue. Mailchimp to get started. Omnisend if SMS is core to your strategy. The right answer depends on what your store is doing in monthly revenue.
Klaviyo is the email marketing tool serious e-commerce stores use, and there's a reason it's the default. The Shopify integration is unmatched — abandoned cart, browse abandonment, post-purchase, win-back, and product-recommendation flows work out of the box with real revenue attribution. Klaviyo was acquired by Shopify in 2024, which means the integration will only get tighter.
The honest caveat: Klaviyo isn't cheap and isn't simple. Setup time is meaningful (1-2 weeks to get core flows live properly). For stores under $5k/month in revenue, Mailchimp is good enough and faster to start.
Best for: Shopify and WooCommerce stores doing $5,000+/month who want to maximize email and SMS revenue. Deep flow automation, real revenue attribution, predictive analytics, segmentation by purchase behavior. The default for stores serious about email as a revenue channel.
Watch out: Pricing scales with both contacts and SMS. At 5,000 contacts plus SMS you're easily $150-200/month. Setup time is real — budget 1-2 weeks to do it properly. For stores under $5k/month revenue, the depth is overkill.
Best for: New stores under $5,000/month revenue. Setup is simple, and the Shopify integration handles basics — abandoned cart, post-purchase, basic segmentation. Good enough for stores still finding product-market fit.
Watch out: Mailchimp slashed its free tier — now just 250 contacts and 500 sends per month, down from 500 contacts. Combined with the contact counting trap (same person on 3 lists = 3 contacts billed), Mailchimp has become significantly less generous than competitors. As your store grows, you'll either need to redesign your list structure or pay 2-3x more than Klaviyo for the same active audience.
Best for: Stores where SMS is a major channel. Omnisend treats SMS as a first-class citizen alongside email, with shared workflows and segmentation. The free tier includes both, which Klaviyo's free tier doesn't.
Watch out: Less powerful than Klaviyo on email alone. The Shopify integration is good but not as deep as Klaviyo's. If SMS isn't a meaningful part of your strategy, you don't need Omnisend's specialty — Klaviyo or Mailchimp will serve you better.
Best for: Hybrid e-commerce + service businesses where you sell products and run sales sequences. ActiveCampaign's automation builder is strongest in the category. Good for stores that also do consultations, B2B, or membership programs.
Watch out: The Shopify integration is functional but not deep. For pure e-commerce, Klaviyo's revenue attribution is better. ActiveCampaign earns its place when you have multiple business models running through one email tool.
Switching email tools at $20k+/month in revenue is genuinely painful. Flows have to be rebuilt, integrations re-tested, segments rebuilt, deliverability re-warmed. Plan for this: start on the right tool for your 12-month projection, not your current month. Most stores who delay the move from Mailchimp to Klaviyo regret it later — the tool earns back the migration cost in 60 days.
The case for Klaviyo over Mailchimp comes down to revenue attribution. Klaviyo shows you exactly how much revenue each flow generates. Mailchimp shows you opens and clicks. Stores that switch from Mailchimp to Klaviyo typically see email revenue increase 20-40% in the first 90 days — not because Klaviyo "sends better emails" but because the visibility lets you optimize what's actually working. If you're earning $5k+/month from email already on Mailchimp, the upgrade pays for itself fast. Below that, the math is harder to justify.
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Klaviyo. The Shopify integration is the deepest in the category — automatic abandoned cart, post-purchase, win-back, and product-recommendation flows work out of the box. Klaviyo is owned by Shopify (acquired 2024) which means the integration will only get tighter.
Once you're doing $5,000+/month in revenue, yes. Below that, the time spent setting up Klaviyo's flows isn't justified. Mailchimp's e-commerce features are good enough for stores under $5k/month. Switch to Klaviyo when revenue from your existing email list hits $1,000/month.
Yes, but with limits. Mailchimp's e-commerce features improved in 2024-2025 but still lag Klaviyo on abandoned cart depth and product recommendations. For stores under $5k/month, Mailchimp works. For serious e-commerce revenue, Klaviyo is the right tool.
Built for Shopify stores serious about email revenue.