Klaviyo
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Klaviyo trades breadth for depth, focusing squarely on ecommerce email and SMS. The free tier works for 250 contacts and 500 monthly emails, making it tight for growing stores but manageable for startups. Native integrations with Shopify and WooCommerce mean your product data syncs automatically, and you can build segments based on purchase behavior.
Best for online sellers who want email and SMS bundled together from the start. Klaviyo's automation tools, even at the free level, run customer journeys around purchases, cart abandonment, and browsing activity.