Best for first-time senders who want the shortest path to a good-looking campaign
Mailchimp is the most widely known platform in the category and still the easiest first send. Under Intuit it has gained polish and price increases in equal measure, and serious ecommerce or automation work now has better-fitting alternatives.
Best for large lists mailed occasionally, where send-based pricing wins
Brevo (formerly Sendinblue) prices by email volume rather than contact count, which makes it dramatically cheaper for large lists mailed occasionally. Feature depth is mid-tier, but the value equation is the strongest in the category for the right sending pattern.
Best for ecommerce brands that need catalog-driven flows and revenue attribution
Klaviyo is an ecommerce customer database that happens to send email. Deep Shopify integration, catalog-aware flows and per-flow revenue attribution make it the category standard for product sellers, at a price that rises fast with list size.