The SNDR alternative to Brevo.

Brevo (formerly Sendinblue) is a broad CRM-style platform with transactional, SMS, chat, and marketing-automation modules. Teams whose primary need is high-quality transactional email infrastructure often want a tighter API surface, idempotent sends, replayable signed webhooks, and operator tooling — none of which sit at the centre of an all-in-one marketing CRM. That is the gap SNDR fills.

Drawn from public documentation and pricing as of build time. We try to keep this fair — file an issue if anything is wrong.

1. 1

   Install the SDK

   Add @rkiza/sndr alongside @getbrevo/brevo. Both can run in parallel during cutover.

   pnpm add @rkiza/sndr

2. 2

   Replace the send call

   Brevo’s SendSmtpEmail maps to sndr.emails.send. The shape is flat instead of nested under message.

   // before
   import * as brevo from '@getbrevo/brevo';
   const api = new brevo.TransactionalEmailsApi();
   api.setApiKey(brevo.TransactionalEmailsApiApiKeys.apiKey, process.env.BREVO_API_KEY!);
   await api.sendTransacEmail({
     sender: { email: 'me@yourdomain.com' },
     to: [{ email: 'a@b.com' }],
     subject: 'hi',
     htmlContent: '<p>hi</p>',
   });
   
   // after
   import { Sndr } from '@rkiza/sndr';
   const sndr = new Sndr(process.env.SNDR_API_KEY!);
   await sndr.emails.send({
     from: 'me@yourdomain.com', to: 'a@b.com', subject: 'hi', html: '<p>hi</p>',
   });

3. 3

   Migrate templates

   Brevo templates use {{ params.name }} placeholders. SNDR templates use {{ variable }}. The most common pattern is a find-and-replace of `params.` → ``.

4. 4

   Migrate webhook handlers

   Brevo posts JSON to your URL with optional IP allowlist + token. SNDR posts JSON with an HMAC-SHA256 signature over a timestamp + raw body. Verify with the shipped helper.

   import { verifyWebhookSignature } from '@rkiza/sndr';
   
   app.post('/webhooks/sndr', express.raw({ type: 'application/json' }), (req, res) => {
     if (!verifyWebhookSignature(req.body, req.header('x-sndr-signature') ?? '', process.env.SNDR_WEBHOOK_SECRET!)) {
       return res.status(400).send('bad signature');
     }
     res.status(200).send('ok');
   });

5. 5

   Reuse your DNS

   SPF can keep Brevo’s include during cutover. Add a fresh DKIM CNAME for the SNDR selector — Brevo’s record stays in DNS until you remove it after cutover.