Transactional email is infrastructure you don't think about until it breaks. The right API delivers your emails reliably, gives you clean developer tools, and doesn't surprise you on pricing. Here's how the leading email APIs compare.
| Tool | Description | Pricing | ||
|---|---|---|---|---|
| Developer-First APIs | ||||
| Resend | React Email integration, clean API, high deliverability. Built by developers. | Free (100/day), Pro from $20/mo | ||
| Postmark | Transactional email specialist. Industry-leading deliverability, detailed analytics. | From $15/mo (10K emails) | ||
| High-Volume Platforms | ||||
| SendGrid | Twilio's email platform. Transactional and marketing email, extensive API. | Free (100/day), from $19.95/mo | ||
| Mailgun | Sinch email API. Sending, receiving, validation, analytics. | Trial free, Starter $35/mo | ||
| Amazon SES | AWS email. Lowest per-email cost at scale, SMTP and API. | $0.10 per 1K emails | ||
| All-in-One Platforms | ||||
| Mailchimp | Marketing + transactional. Email campaigns, automation, landing pages. | Free to 500, from $13/mo | ||
| Brevo | Email, SMS, chat, CRM in one platform. Formerly Sendinblue. | Free (300/day), from $9/mo | ||
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