Customer.io vs Brevo (formerly Sendinblue)
Side-by-side from the Top 11 rankings of HubSpot vs ActiveCampaign vs Klaviyo: 11 Best Marketing Automation Software 2026 and ActiveCampaign vs ConvertKit vs Brevo: 11 Best Email Marketing Software 2026. Last verified June 7, 2026.
The short answer
Brevo (formerly Sendinblue) ranks higher on Top 11 (#3 vs #6) for Marketing managers choosing marketing automation platforms (HubSpot vs Marketo vs ActiveCampaign vs Klaviyo) / Small business owners and marketers choosing email marketing tools (Mailchimp alternatives). The best all-in-one platform, offering email, SMS, chat, and more with an incredibly generous free plan.
At a glance
| Customer.io | Brevo (formerly Sendinblue) | |
|---|---|---|
| Top 11 rank | #6 / HubSpot vs ActiveCampaign vs Klaviyo: 11 Best Marketing Automation Software 2026 | #3 / ActiveCampaign vs ConvertKit vs Brevo: 11 Best Email Marketing Software 2026 |
| Score (out of 9.4) | 8.2 | 8.8 |
| Best for | Event-driven messaging for tech | All-in-one marketing suite |
| Pricing | $$ ($100 to $1,500/mo) | $ ($25 to $66+/mo) |
| HQ | Portland, USA | Paris, France |
| Founded | 2012 | 2012 |
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
Brevo (formerly Sendinblue)
The best all-in-one platform, offering email, SMS, chat, and more with an incredibly generous free plan.
www.brevo.comSee full entry in ActiveCampaign vs ConvertKit vs Brevo: 11 Best Email Marketing Software 2026
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.