Customer.io vs Omnisend
Side-by-side from the Top 11 rankings of HubSpot vs ActiveCampaign vs Klaviyo: 11 Best Marketing Automation Software 2026 and Klaviyo vs Omnisend vs Drip: 11 Best Email Marketing Platforms for Ecommerce 2026. Last verified June 7, 2026.
The short answer
Omnisend ranks higher on Top 11 (#2 vs #6) for Marketing managers choosing marketing automation platforms (HubSpot vs Marketo vs ActiveCampaign vs Klaviyo) / Ecommerce brands running flows and campaigns. Affordable, unified email and SMS for growing stores.
At a glance
| Customer.io | Omnisend | |
|---|---|---|
| Top 11 rank | #6 / HubSpot vs ActiveCampaign vs Klaviyo: 11 Best Marketing Automation Software 2026 | #2 / Klaviyo vs Omnisend vs Drip: 11 Best Email Marketing Platforms for Ecommerce 2026 |
| Score (out of 9.4) | 8.2 | 9.2 |
| Best for | Event-driven messaging for tech | All-in-one email, SMS, push |
| Pricing | $$ ($100 to $1,500/mo) | $$ ($100 to $800/mo) |
| HQ | Portland, USA | London, UK |
| Founded | 2012 | 2014 |
Customer.io
A flexible, API-first platform for tech companies to automate messaging based on user behavior.
customer.ioSee full entry in HubSpot vs ActiveCampaign vs Klaviyo: 11 Best Marketing Automation Software 2026
Omnisend
Affordable, unified email and SMS for growing stores.
www.omnisend.comSee full entry in Klaviyo vs Omnisend vs Drip: 11 Best Email Marketing Platforms for Ecommerce 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.