Mailchimp vs Klaviyo: Which is better in 2026?

If you sell products, this comparison is already over. Klaviyo treats order and browse data as native customer attributes, so abandoned-cart, post-purchase and win-back flows are prebuilt and revenue attribution per flow is included. Mailchimp can approximate this through integrations, but you feel the seams, and its reporting stops at engagement where Klaviyo's reports dollars. The counterargument is real for everyone else: Mailchimp is easier, cheaper at small list sizes, and its free tier lets you validate email as a channel before spending. Our switcher data runs one way — brands move from Mailchimp to Klaviyo as revenue grows, and rarely back — so if you are an ecommerce business already past roughly $20k a month, treat Mailchimp as a stage you have finished rather than a saving.