Customer.io vs Braze: Which Should You Use in 2026?

Customer.io vs Braze — the honest comparison.

The short version

Customer.io is flexible for mid-market; Braze is enterprise-grade with a higher price and onboarding.

What both share

On shared IP pools your reputation depends partly on other senders. A dedicated, isolated IP with managed deliverability avoids that entirely.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus a REST API and an AI watching deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.