Klaviyo

Klaviyo is the leading email and SMS marketing platform for e-commerce, used by over 169,000 businesses worldwide. Officially recommended by Shopify Plus, it stands out for its advanced segmentation capabilities, automation, and 350+ native integrations.

At the heart of Klaviyo lies its powerful segmentation based on real-time behavioral data. Unlike traditional tools limited to demographic data, Klaviyo leverages every customer interaction: purchase history, site browsing, cart abandonment, email engagement, and even AI predictions on customer lifetime value (CLV) and repurchase probability.

Klaviyo's flow builder is renowned for its intuitive interface and flexibility. Create sophisticated automations with conditional segments, built-in A/B testing, and advanced trigger filters. Whether for welcome sequences, abandoned cart follow-ups, or post-purchase campaigns, each flow can be customized down to the pixel.

The platform evolved in 2025 toward active profile-based billing rather than send volume. This approach is fairer for businesses with engaged lists but can penalize those with large inactive contact bases. A protection mechanism limits increases to 25% maximum per billing cycle.

SMS offering complements email with features like Smart Opt-in, multi-channel A/B testing, and multi-touch attribution. For larger enterprises, Klaviyo One (automatically activated above $10,000/month) adds premium features with a 20% surcharge.

Built-in analytics allow tracking revenue generated by each email, segment, and automation. Industry benchmarks position you against competitors. The optional CDP (Customer Data Platform) at $500/month unifies all your marketing data for a 360° customer view.

Klaviyo excels for growing e-commerce brands wanting to maximize customer retention and email revenue. Small businesses can start for free (250 profiles, 500 emails/month), but should anticipate rapid cost increases as their list grows.