Brevo

Brevo (formerly Sendinblue) bundles transactional, marketing, CRM, and SMS. The 300-emails-per-day free tier is one of the most generous in the market. Best as an all-in-one for small businesses; pure-API users may find the surface broader than they need.

Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.

Against high-frequency programmatic sends where a missed delivery is a product failure, Brevo covers webhook coverage, event stream, the suppressions API, batch sending, and SDK breadth, and does not cover idempotency keys and operating track record. Whether that gap matters depends on how central those are to the build.

• Idempotency keys: No
• Webhooks: Yes
• Event stream: Yes
• Operating since: 2012
• Suppressions API: Yes
• Best published rate per 1,000: Tiers not published in comparable form
• Batch sending: Yes
• SDKs: node, python, go, ruby, php, java, dotnet
• Deliverability: Reliable for marketing and transactional; per-day free-tier limits prevent spam abuse.

Reliable for marketing and transactional; per-day free-tier limits prevent spam abuse.

Small businesses that need email plus marketing plus SMS in one place.