Customer.io vs Klaviyo

Two ai email marketing tools side by side. Anything the vendor hasn’t confirmed says so.

Customer.io compared with Klaviyo
	Customer.io #2 in AI email marketing	Klaviyo #1 in AI email marketing
What it does	Email, push and SMS automation driven by your product data.	Email and SMS platform for ecommerce with AI-built segments and flows.
Monthly searches	1,900	74,000
Pricing	From $100/mo, billed monthly ($100 monthly)	Free plan
All plans	All plans Essentials Annual price not stated $100 /mo, billed monthly Source Premium $1,000 /mo, billed annually Monthly price not stated Source Enterprise Annual price not stated Monthly price not stated Source	All plans Free Annual price not stated Monthly price not stated Source
Free trial	Not mentioned on their pricing page	Free plan instead of a trial
Integrations	Not confirmed	Not confirmed
Listing status	Unclaimed	Unclaimed
Website	customer.io	klaviyo.com

Pricing and trials come from each vendor’s pricing page, checked Customer.io: Nov 2, 2026; Klaviyo: Nov 2, 2026.

Searches are US monthly volumes for each tool’s brand query, Semrush, October 2026.