Klaviyo

Klaviyo dominates Shopify-shaped ecommerce email and SMS. Deep integrations with storefronts, predictive analytics, and template builder. Less developer-centric than Customer.io, but the data model is rich.

Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.

Against behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, Klaviyo covers scheduling, event stream, and the suppressions API, and does not cover operating track record and multi-tenant support. Whether that gap matters depends on how central those are to the build.

• Scheduling: Yes
• Event stream: Yes
• Deliverability: Solid for ecommerce traffic.
• Operating since: 2012
• Suppressions API: Yes
• Best published rate per 1,000: Tiers not published in comparable form
• Multi-tenant: No
• Free tier: 500 emails to 250 contacts
• Starts at: $45/mo for 5,000 emails

Solid for ecommerce traffic.

Shopify and ecommerce teams.