Resend
performance benchmarks
Browse Resend's observed email API response time, error rates, and incident history over the last 90 days.
Live performance metrics
Real-world performance data from messages sent through Knock
| Message volume | Growth | Status page updates (30d) | Status page updates (90d) |
|---|---|---|---|
10M–25M | 1st of 10 → | 5 | 20 |
From March 3rd to June 1st, Knock routed 10M–25M messages through Resend. For adoption, Resend ranks 1st of 10 providers based on new channel connections, with adoption holding steady over the period. Resend reported 20 status page updates over the last 90 days, 5 of which were in the last 30 days.
Response time
Response time measures how long Resend takes to accept an API request from Knock, including connection overhead and any automatic retries. Lower values mean faster message hand-off.
| Median (p50) | p90 | p95 | p99 |
|---|---|---|---|
88ms | 148ms | 176ms | 363ms |
From March 3rd to June 1st, Resend averaged a daily median response time (p50) of 88ms across all days in the range, meaning half of all requests on a typical day complete in under 88ms. The 99th percentile averaged 363ms, with a peak daily p99 of 1410ms. This is slightly higher than some providers, which may reflect additional processing Resend performs on message acceptance.
Error rate
Error rate tracks the ratio of 5xx responses and timeouts to total requests. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
| Avg. daily error rate | Highest daily rate | Peak error date | Zero-error days | Days above 0.01% |
|---|---|---|---|---|
0.03% | 2.02% | Mar 20 | 84 | 4 |
From March 3rd to June 1st, Resend averaged a 0.03% daily error rate for 5xx responses and timeouts, with the highest single-day error rate reaching 2.02%. This is one of the lowest error rates among providers on Knock, indicating strong reliability and consistent uptime. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
About these metrics: Data represents messages sent through Knock to Resend during the specified period. Response time measures time from Knock to provider acceptance. Error rate includes only provider 5xx responses and timeouts.
Recent Resend incidents
Recent status page incidents for Resend
Started May 26, 2026 — Resolved May 26, 2026
Status: Resolved We have resolved the underlying issue and service has been resumed. Affected components Broadcast Emails (Operational) Website (Operational) Single Email (Operational) Dashboard (Operational) Email Events (Operational) SMTP (Operational) Batch Emails (Operational) General API (Operational) Webhooks (Operational)
Started May 20, 2026 — Resolved May 20, 2026
Status: Complete We've completed our Email Events maintenance, and they are now showing the up-to-date status. Affected components Email Events (Operational)
Started May 8, 2026 — Resolved May 8, 2026
Status: Resolved We have resolved the underlying issue by reverting the unintended breaking change and service has been resumed. Affected components Dashboard (Operational) Batch Emails (Operational) General API (Operational) Single Email (Operational) Email Events (Operational) SMTP (Operational) Broadcast Emails (Operational) Webhooks (Operational) Website (Operational)
Started May 6, 2026 — Resolved May 6, 2026
Status: Resolved This incident is resolved. All failed provisioning requests have been reprocessed, and custom tracking domain creation is operating normally.
Started May 5, 2026 — Resolved May 5, 2026
Status: Complete We've successfully completed our maintenance, and the logs page is now behaving normally. Affected components Dashboard (Operational)
Compare Resend with other providers
About Resend
Resend is a modern email API built for developers, with React Email support and a focus on simplicity.
Pros
- Beautiful documentation with attention to detail and great developer experience
- Created and maintain React Email, the go-to framework for building email templates in React
- Minimalist, developer-optimized platform that avoids bloat with a focused UI
- Transparent observability with real-time visibility into sends, failures, and engagement
Cons
- Newer and less battle-tested compared to incumbents like Mailgun or SendGrid
- Fewer enterprise features than established providers
- Limited marketing email capabilities
Frequently asked questions
What is Resend?
Resend is an email service provider commonly used for developer-centric transactional email, react-based email templates, startup and early-stage email delivery. Resend is a modern email API built for developers, with React Email support and a focus on simplicity.
How much does Resend cost?
Free tier includes 3,000 emails per month and 100 emails per day. Paid plans start at $20/month for 50,000 emails with overages at $0.90/1K on Pro, scaling down to $0.46/1K on Scale 2.5M. Resend offers a free tier with up to 3,000 emails, with a hard sending limit on that plan.
How fast is Resend?
Based on real-world data from messages sent through Knock, Resend accepts API requests with a median response time of 88ms (p50) and 363ms at the 99th percentile.
How reliable is Resend?
From March 3rd to June 1st, Resend showed an error rate of 0.03% for 5xx responses and timeouts across 10M–25M messages sent through Knock. Knock automatically retries failed requests, so transient provider errors rarely affect end-user delivery.
What are the pros and cons of Resend?
Key strengths include beautiful documentation with attention to detail and great developer experience and created and maintain react email, the go-to framework for building email templates in react. On the other hand, newer and less battle-tested compared to incumbents like mailgun or sendgrid and fewer enterprise features than established providers.
Does Resend work with Knock?
Yes. Knock has a native Resend integration that enables you to send email notifications through Resend as part of a cross-channel workflow. You can combine Resend with other channels like in-app feeds, push, SMS, and Slack from a single API call.
Use Resend with Knock
Knock enables you to integrate Resend alongside other notification channels, manage templates, and orchestrate cross-channel workflows from a single platform.