Klaviyo vs Customer.io
Side-by-side from the Top 11 rankings of The 11 Best Email Marketing Platforms for Ecommerce (2026) and The 11 Best Marketing Automation Software (2026). Last verified June 11, 2026.
The short answer
Klaviyo ranks higher on Top 11 (#1 vs #6) for Ecommerce brands running flows and campaigns / Marketing managers choosing marketing automation platforms (HubSpot vs Marketo vs ActiveCampaign vs Klaviyo). Unbeatable Shopify data integration for powerful segmentation.
At a glance
| Klaviyo | Customer.io | |
|---|---|---|
| Top 11 rank | #1 / The 11 Best Email Marketing Platforms for Ecommerce (2026) | #6 / The 11 Best Marketing Automation Software (2026) |
| Score (out of 9.4) | 9.4 | 8.2 |
| Best for | Shopify power users | Event-driven messaging for tech |
| Pricing | $$$ ($200 to $1,500+/mo) | $$ ($100 to $1,500/mo) |
| HQ | Boston, USA | Portland, USA |
| Founded | 2012 | 2012 |
Klaviyo
Unbeatable Shopify data integration for powerful segmentation.
www.klaviyo.comSee full entry in The 11 Best Email Marketing Platforms for Ecommerce (2026)
Customer.io
A flexible, API-first platform for tech companies to automate messaging based on user behavior.
customer.ioSee full entry in The 11 Best Marketing Automation Software (2026)
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.