Brevo (formerly Sendinblue)
Email Free key (no card)
AuthenticationFree key (no card)
Rate limitFree tier: 300 emails per day, unlimited contacts, no credit card
Documentation: developers.brevo.com · Checked Sep 13, 2026
About
Brevo is a full email marketing and transactional-email platform whose free tier is one of the most generous around: 300 emails a day (about 9,000 a month), unlimited contact storage, and no credit card required. Beyond the API it has drag-and-drop newsletter templates, automation workflows, and CRM features, so a small business can run both one-off emails and newsletters from one free account.
Details
Free to start. You may need a free key, but no credit card.
Auth: Free key (no card)
Rate limit: Free tier: 300 emails per day, unlimited contacts, no credit card
Verified: 2026-09-13
Best for: business personal developer
Setup
- Sign up free at brevo.com and confirm your email
- Go to Settings → SMTP & API → API Keys and generate a new key
- Add and verify your sender address under Senders
- For best deliverability, add their SPF/DKIM DNS records to your domain (their setup wizard walks you through it)
- Send a test email from the dashboard or with the API example in their docs
Example
POST https://api.brevo.com/v3/smtp/emailUse cases
- Run a free weekly newsletter to your mailing list
- Send account and order emails from your app via their API or SMTP
- Build automated email sequences (welcome series, abandoned cart) for free