Two transactional email providers, compared on price, features and ratings, so you can pick fast.
Updated September 2026
THE VERDICT
Brevo wins on price and sending APIs. Customer.io wins on compliance and support.
Brevo and Customer.io take different pricing approaches. Brevo rates higher with developers (4.5 vs 4.4 on G2). Pick based on volume and team, and the scorecard below breaks down where each one leads.
Winner cells are tinted, green where Brevo leads, violet where Customer.io does.
FAQ
Brevo rates higher on G2 (4.5 vs 4.4). Ratings are aggregated from public review platforms as of the date shown.
Brevo pricing is based on email volume sent rather than contact count. Paid plans start with the Starter tier at about $9 per month for 5,000 emails, then scale up with volume, with higher-tier prices varying somewhat depending on when and where you check. A Business tier and custom Enterprise plans with dedicated IPs and SLAs are also available.
Customer.io maintains official server side libraries for Ruby, Python, Go, and Node.js. It also offers official client SDKs for JavaScript on the web, iOS, Android, React Native, and Flutter. Integrations are built on its Pipelines API and Track API for ingesting data and its App API for sending messages.
Yes. Many teams route different message types through different providers or fail over between them. Courier lets you send through both behind a single API and switch providers without changing your code.
Why not both?
Use both behind one API.
Route Brevo, Customer.io, or both, and switch providers without changing your code. Courier sits in front of every channel.
Pricing, plans and feature availability as of September 2026 and may change. Ratings are aggregated from public review platforms.