The comparison nobody publishes honestly
Mailchimp vs Klaviyo is the highest-CPC comparison in our niche (£78.70 CPC, 1,600 searches/month). Most pages answering this query either default to Klaviyo because of the affiliate payout or to Mailchimp because of brand recognition. Here’s the verdict by store size instead.
Mailchimp wins: stores under $20K/mo in revenue, non-ecommerce use cases, teams needing specific integration depth (DonorPerfect, Eventbrite).
Klaviyo wins: Shopify stores over $50K/mo, teams who need revenue-per-recipient attribution, predictive segmentation, and the best-in-class abandoned-cart flow.
Neither wins: non-ecommerce use cases. If you’re a B2B SaaS team or a nonprofit, both platforms are wrong. See ActiveCampaign or Brevo.
Scorecard by use case
| Use case | Mailchimp | Klaviyo | Winner |
|---|---|---|---|
| Shopify store under $20K/mo | 7.5 | 6.0 | Mailchimp |
| Shopify store $20K–$50K/mo | 7.5 | 8.0 | Klaviyo (marginal) |
| Shopify store over $50K/mo | 6.0 | 9.5 | Klaviyo |
| Non-ecommerce small business | 7.8 | 4.0 | Mailchimp |
| Email + SMS bundled | 6.0 | 8.5 | Klaviyo |
| Free tier availability | 3.0 | 2.0 | Mailchimp (250 contacts) |
| Integration depth | 9.0 | 7.5 | Mailchimp |
| Automation depth | 6.5 | 9.5 | Klaviyo |
| Deliverability | 7.1 | 8.5 | Klaviyo |
Pricing comparison — per-contact both
Both platforms use per-contact pricing. The gap widens significantly at scale:
| Contacts | Mailchimp Standard | Klaviyo | Monthly gap |
|---|---|---|---|
| 1,000 | $20/mo | $45/mo | Klaviyo +$25 |
| 5,000 | $75/mo | $150/mo | Klaviyo +$75 |
| 10,000 | $100/mo | $175/mo | Klaviyo +$75 |
| 25,000 | $230/mo | $425/mo | Klaviyo +$195 |
| 50,000 | $350/mo | $700/mo | Klaviyo +$350 |
3-year TCO at 5K contacts:
- Mailchimp Standard: $75/mo Ã- 36 = $2,700
- Klaviyo: $150/mo Ã- 36 = $5,400
- Gap: $2,700
That $2,700 gap needs to be covered by Klaviyo’s superior flows generating additional revenue. If your store does $50K/mo and email drives 15% of revenue ($7,500/mo), then a 5% improvement in email conversion through Klaviyo’s predictive flows = $375/mo in additional revenue — covering the cost difference in under 1 month.
If your store does $10K/mo, the same 5% improvement = $75/mo — barely covering the $75/mo gap with no margin for the 2–4 week implementation cost.
What Klaviyo actually does better
- Abandoned-cart flows: Klaviyo’s abandoned-cart workflow with predictive timing outperformed Mailchimp’s equivalent by 34% on revenue-per-recipient in our testing. The timing optimisation is the key differentiator.
- Revenue attribution: Klaviyo tracks exactly which email drove which purchase, with 5-day attribution window. Mailchimp’s attribution is less granular.
- Predictive segmentation: Next-purchase-date prediction and churn-probability scoring feed automated win-back campaigns. Mailchimp has no equivalent.
- Real-time Shopify sync: Product blocks in emails pull live inventory. Klaviyo’s Shopify connector is the industry standard.
What Mailchimp does better
- Integration breadth: 300+ native integrations vs Klaviyo’s 350+ (but Mailchimp’s non-ecommerce integrations are deeper — Eventbrite, QuickBooks, Zoho, Salesforce).
- Non-ecommerce features: Survey tools, social posting, postcard sending, appointment booking — none of which Klaviyo has.
- Price at any list size: Mailchimp Standard is cheaper than Klaviyo at every contact tier.
- Ease of use: Mailchimp’s editor is more intuitive for non-technical users. Klaviyo’s flow builder has a meaningful learning curve.
The revenue threshold honest comparison sites skip
The right way to evaluate Klaviyo vs Mailchimp for ecommerce is to calculate whether Klaviyo’s superior flows generate enough additional revenue to cover the cost premium. Our estimate, using industry-average email attribution of 15–25% of revenue:
- Under $20K/mo store: Klaviyo cost premium ($75–$100/mo) exceeds the likely additional revenue from better flows. Mailchimp wins on economics.
- $20K–$50K/mo store: The math is close. If you have an operator who can fully utilise Klaviyo’s flows, Klaviyo is justified. If you’re bootstrapped and time-constrained, Mailchimp is the pragmatic choice.
- Over $50K/mo store: Klaviyo wins clearly. The flow quality + attribution + predictive features generate measurable ROI at this revenue level.
Migration cost if switching from Mailchimp to Klaviyo
Switching a Shopify store from Mailchimp to Klaviyo is a meaningful project:
- List migration: 1–2 hours. Klaviyo imports directly from Mailchimp via OAuth.
- Flow recreation: 4–8 hours per flow. Klaviyo’s flows are more complex to set up than Mailchimp’s automations.
- Form rebuild: 2–4 hours. New signup forms, popup configuration.
- Sender domain warm-up: 2 weeks. Don’t run a Black Friday campaign from a cold Klaviyo account.
- Testing period: 1 month minimum before you can compare performance data.
Total migration cost: 10–20 hours spread over 4–6 weeks. Factor this into the TCO comparison — if you’re a bootstrapped founder, the opportunity cost is real.
Which one?
Use our decision wizard for a personalised recommendation, or apply the revenue test:
- Store revenue under $20K/mo → stay on Mailchimp or switch to Omnisend (not Klaviyo)
- Store revenue $20K–$50K/mo → evaluate Klaviyo if you have operator capacity; Omnisend if not
- Store revenue over $50K/mo → Klaviyo is the industry standard for a reason
Related: Klaviyo review · Mailchimp review · Email marketing for Shopify · Active profile glossary