Postmark vs Brevo (Sendinblue)
A detailed comparison of Postmark and Brevo (Sendinblue) for sending transactional emails. Which email API is right for your application?
Postmark vs Brevo (Sendinblue): the short answer
Choose Postmark when you only need email sent from your app: its plans are priced by monthly email volume, from a 100-email free developer plan to Basic at $15/month for 10,000 emails. Choose Brevo when the same account should also run marketing campaigns: its free plan sends up to 300 emails a day once Brevo approves the account, and its paid plans bundle campaigns with transactional messages.
Postmark vs Brevo (Sendinblue) pricing and limits
Checked October 11, 2026 against the official Postmark pricing page and Brevo pricing page. Recheck both pages for the volume you need before buying, because providers change limits.
| Decision factor | Postmark | Brevo (Sendinblue) |
|---|---|---|
| Free sending | 100 emails/month (developer plan, no overages) | Up to 300/day after account approval |
| First paid plan | Basic: $15/month for 10,000 emails; extra $1.80 per 1,000 | Starter: from 5,000 emails/month (price set by volume) |
| What the plan covers | Email sending priced by volume | Email campaigns plus transactional messages; SMS sold separately |
| MCP for AI agents | Official MCP server (ActiveCampaign/postmark-mcp) | MCP for ChatGPT & Claude (Starter feature) |
Postmark vs Brevo (Sendinblue) FAQ
Which has the bigger free plan, Postmark or Brevo?
Brevo. As checked on October 11, 2026, Brevo's free plan allows up to 300 emails per day once Brevo approves the account for sending. Postmark's free developer plan includes 100 emails per month with no overages, meant for testing an integration.
What does the first paid plan cost on Postmark and Brevo?
Postmark Basic is $15 per month for 10,000 emails, with extra emails at $1.80 per 1,000. Brevo's Starter plan starts from 5,000 emails per month, and Brevo sets the price by the volume you choose on its pricing page.
Is Postmark or Brevo better for transactional email?
Postmark is a sending service priced by email volume. Brevo is a marketing platform whose plans include transactional messages alongside campaigns, with SMS sold separately. Pick Postmark for app email only, and Brevo if the same account should also send newsletters.
Overview
Both Postmark and Brevo (Sendinblue) provide email APIs for sending transactional emails from applications. Postmark and Brevo (Sendinblue) each have strengths — Postmark is known for its developer experience, while Brevo (Sendinblue) offers different pricing and feature trade-offs. AISend is a third option worth weighing: a Resend-compatible API at lower flat pricing.
Features comparison
Key differences between Postmark and Brevo (Sendinblue): API design and developer experience, custom domain support, webhook event tracking, bounce/complaint handling, and pricing structure. Both providers offer REST APIs and SDKs but differ on pricing and migration effort. AISend is a third option — a Resend-compatible API with flat pricing: $14/month for 50,000 emails.
Pricing
Pricing is a major factor when choosing an email API. Compare free tiers and trials, per-email costs at different volumes, and what's included in each plan. AISend offers a 3-day free trial with 500 emails and no credit card. Pro is $14/month for 50,000 emails — the same volume Resend charges $20/month for. Both Postmark and Brevo (Sendinblue) have transparent pricing. AISend's plans are flat with no hidden per-contact fees, and migration from a Resend-compatible API is a one-line change.
Which should you choose?
If you're choosing between Postmark and Brevo (Sendinblue), it's worth also evaluating AISend — a Resend-compatible API at flat pricing ($14/month for 50,000 emails), where switching from Resend is a base-URL change.
More comparisons
Try AISend with a 3-day free trial
3-day free trial, 500 emails, no credit card. Resend-compatible API.
Start Free Trial