Brevo vs Nylas: When to Use Each

Command references used in this guide: nylas email send, nylas email list, and nylas email search.

What is the difference between Brevo and Nylas?

Brevo is an outbound platform: you build campaigns and transactional templates, and it delivers them from a domain you verify, handling DKIM, list management, and bounce tracking. Nylas is a contextual email API: it connects to a user's existing mailbox over OAuth and reads, searches, and sends from their real address. Brevo sends to a contact list; Nylas works inside an inbox a person already owns.

The company launched in 2012 as Sendinblue and rebranded to Brevo in May 2023, repositioning from an email tool into an all-in-one marketing and CRM suite. According to the Brevo API docs, the platform exposes campaigns, transactional email, SMS, and contact lists through one REST API. None of those endpoints read a user's inbox — that capability isn't part of what an outbound sender does.

What does Brevo do well?

Brevo's strength is combining marketing and transactional sending in one account with a low entry price. You design campaigns in a drag-and-drop editor, segment contacts, automate drip sequences, and send receipts through the same API key. For a small team that wants newsletters and password-reset emails without stitching two vendors together, that consolidation saves real setup time.

The free tier is unusually generous for a marketing platform. Per Brevo's pricing page, the free plan allows 300 emails per day with unlimited contact storage, and paid tiers remove the daily cap and the Brevo logo. What it does not offer is any view into a recipient's mailbox — like every sender, Brevo is outbound only and cannot read a reply thread.

// Brevo — send a transactional email (outbound, from your verified domain)
import * as Brevo from '@getbrevo/brevo'
const api = new Brevo.TransactionalEmailsApi()
api.setApiKey(Brevo.TransactionalEmailsApiApiKeys.apiKey, 'xkeysib-your-key')

await api.sendTransacEmail({
  sender: { email: 'noreply@yourapp.com', name: 'Your App' },
  to: [{ email: 'user@example.com' }],
  subject: 'Your receipt',
  htmlContent: '<p>Thanks for your purchase.</p>',
})

How do Brevo and Nylas compare feature by feature?

The table compares both across nine dimensions. Brevo leads on campaign tooling, list management, and bundled SMS; Nylas leads on inbox access, calendar, and provider coverage. The only real overlap is the send capability — and there, Brevo sends from your domain while Nylas sends from the user's own address inside the original thread.

When should you use Nylas instead?

Reach for Nylas when the inbox itself is the feature. A CRM that logs the real thread with a prospect, an AI agent that triages a shared support mailbox, or a scheduler that sends invites from the rep's own calendar all need to read and write inside a user's account — something a marketing platform can't do. The user connects once over OAuth, and your app then acts on their behalf across six providers.

The CLI makes that concrete. After one login you can search a real inbox and send from the connected address in about two minutes, with JSON output for scripts and AI pipelines. Brevo would never see those messages, because it only knows the mail your campaigns generate. For agent workflows, Nylas adds Agent Accounts and an MCP server, which Brevo has no equivalent for.

# Nylas — work inside the user's real mailbox
nylas auth login --provider google
nylas email search "subject:invoice" --json --limit 10
nylas email send --to client@example.com \
  --subject "Re: invoice 4471" \
  --body "Replying from my own inbox, in the same thread."

Which should you choose?

Choose Brevo when you send newsletters, drip campaigns, or transactional receipts from your own domain and want list management bundled in — the 300-per-day free tier is enough to launch a small product. Choose Nylas when your product reads or sends from a user's real inbox, needs calendar and contacts, or powers an AI agent. Plenty of teams run both: Brevo for outbound campaigns, Nylas for the customer-facing inbox.

The honest dividing line is the sender address. If the mail leaves noreply@yourapp.com, a dedicated sender like Brevo is the right tool. If it leaves user@theircompany.com and you need to read the reply, that's Nylas. See the full email API comparison for where SES, SendGrid, Mailgun, and Postmark land.

Next steps

• Best email API for developers — SES, SendGrid, Mailgun, Postmark, and Resend compared
• SendGrid vs Nylas — transactional relay vs contextual inbox access
• Mailgun vs Nylas — sending and routing vs reading a user's inbox
• Send email from the terminal — one command across six providers
• Mandrill vs Nylas — Mailchimp transactional vs inbox access
• Full command reference — every flag and subcommand documented