Your email platform quietly decides how much revenue your list produces. Pick wrong and you'll rebuild within a year.
The short answer
Klaviyo wins for e-commerce: native purchase-data segmentation, predictive LTV and flows that routinely drive 25-35% of store revenue. Mailchimp fits content-led businesses and early-stage lists wanting simple sends cheaply. Migrating later costs weeks - choose by business model, not price tag.
Built for commerce data
Best for: Shopify/WooCommerce stores serious about flow-driven revenue
Typical cost: Scales with profiles; free tier exists, paid from ~$45/mo
Simple sends, broad use
Best for: Content businesses, service companies, early lists under ~10K contacts
Typical cost: Generous free tier; affordable early tiers
When revenue comes primarily from online store orders
Pick Klaviyo
When list monetizes via content/services, not carts
Pick Mailchimp
When flows should generate 20%+ of revenue
Pick Klaviyo
When under 2K contacts and testing the channel
Pick Either - migrate later
Our verdict
Match the tool to the revenue model. Stores earn their keep through behavioral flows - that is Klaviyo territory. Audience businesses earn through consistent sending - Mailchimp does that fine. David Okafor's lifecycle desk builds both, and migration is a solved problem when you outgrow the choice.
Plan on 2-4 weeks: list export/import, domain authentication, flow rebuilding and QA. Templates move easily; logic needs careful recreation - which is why choosing correctly now saves real money.
Healthy stores see 20-35% of monthly sales from owned channels within two quarters of proper flow architecture. Below 15% means the flows exist but nobody is engineering them.
More comparisons
Book the free audit - we will model both paths on your actual numbers in one call.