Best for e-commerce businesses focused on email marketing. USP: Klaviyo is an email marketing platform that enables e-commerce businesses to send highly targeted and personalized email campaigns. Ideal for Shopify, WooCommerce, and Magento users, it integrates seamlessly with online stores. With advanced segmentation, behavioral tracking, and automation features, Klaviyo helps businesses drive revenue through personalized, data-driven email marketing. Perfect for businesses looking to boost conversions and customer retention.