Courier vs Resend
Notification API with multi-channel orchestration, templates, and preferences
vs. The email API for developers — built by the Nodemailer team
Pricing tiers
Courier
Free
Up to 10,000 notifications/month. All channels. Community support.
Free
Business
From $99/mo. Higher volumes, advanced routing, preference center, branding removal.
$99/mo
Enterprise
Custom. SOC 2, SSO, dedicated support, volume discounts, SLA.
Custom
Resend
Free
3,000 emails/month, 100 emails/day. 1 custom domain. Ideal for side projects.
Free
Pro — 50k
50,000 emails/month. 10 custom domains. Priority support.
$20/mo
Pro — 100k
100,000 emails/month. 10 custom domains.
$35/mo
Scale — 100k+
Tiered from 100k → 2.5M emails/month. Dedicated IP add-on available.
$90/mo
Scale — 2.5M
2.5M emails/month.
$1150/mo
Enterprise
3M+/month, dedicated IP included, SSO, custom contract.
Custom
Free-tier quotas head-to-head
Comparing free on Courier vs free on Resend.
| Metric | Courier | Resend |
|---|---|---|
| custom domains | — | 1 domains |
| emails per day | — | 100 emails/day |
| emails per month | — | 3000 emails/month |
| notifications monthly | 10000 notifications/mo | — |
Features
Courier · 13 features
- Chat — Slack, Microsoft Teams, Discord, Mattermost.
- Email — SendGrid, Postmark, Mailgun, AWS SES, Resend, SMTP.
- Inbox (In-App) — React/JS drop-in in-app inbox component.
- Lists — Segment recipients for bulk notification sends.
- Logs + Analytics — Per-message delivery timeline + engagement.
- Multi-channel Routing — Provider failover + preferred channel per user.
- Notification Designer — Visual editor for templates across channels.
- Preferences — Per-user notification preferences hub.
- Push — APNs, FCM, Expo, OneSignal.
- Send API — POST /send with template + recipients + data.
- SMS — Twilio, MessageBird, Vonage, Plivo, Telnyx.
- Templates + Versioning — Template brands, variants, localization, version history.
- Webhooks — Delivery + engagement event webhooks.
Resend · 12 features
- Audiences — Contact list management with custom fields.
- Batch Send — Send up to 100 emails in one API call.
- Broadcasts — Bulk email campaigns with audiences, A/B testing, analytics.
- Dedicated IP — Add-on for high-volume senders. Auto warmup.
- Domains — DKIM/SPF/DMARC auto-verification. Per-domain analytics.
- Idempotency — Prevent duplicate sends with Idempotency-Key header.
- Logs + Analytics — Full email logs, delivery heatmap, events table.
- React Email — OSS library (3M+ downloads) to compose emails in React/JSX.
- Scheduled Send — scheduledAt parameter for future delivery.
- Send API — POST /emails endpoint to send. Supports attachments, scheduled send, idempotency…
- Suppressions — Auto-managed bounce + complaint list. API to add/remove.
- Webhooks — Email lifecycle events: sent, delivered, bounced, complained, opened, clicked.
Developer interfaces
| Kind | Courier | Resend |
|---|---|---|
| CLI | Courier CLI | Resend CLI |
| SDK | courier-go, courier-java, @trycourier/courier, trycourier (Python), @trycourier/react-inbox, trycourier (Ruby) | react-email, resend-go, resend-node, resend-php, resend-python, resend-ruby |
| REST | Courier REST API | Resend REST API |
| OTHER | Courier Studio, Outbound Webhooks | SMTP Relay, Webhooks (Svix) |
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