Klaviyo, at $45/mo against $100/mo.
Customer.io vs Klaviyo
Klaviyo is cheaper at $45/mo, against $100/mo.
Lifecycle and CRM automation across email, SMS, push

Ecommerce email and SMS marketing automation
Customer.io and Klaviyo are alternatives in the Lifecycle email category. Customer.io: Lifecycle and CRM automation across email, SMS, push. Klaviyo: Ecommerce email and SMS marketing automation. Klaviyo is cheaper at $45/mo against $100/mo.
Lifecycle and CRM automation across email, SMS, push. It sits in the lifecycle email category.
Ecommerce email and SMS marketing automation. It sits in the lifecycle email category.
They are alternatives at the same step, so most stacks pick one or the other. No aistack.sh stack uses both today, though nothing prevents a custom workflow.
Beyond each other, Customer.io's closest alternatives are tracked in its tool page. Klaviyo's closest alternatives are tracked in its tool page.
