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What is Resend?
Email API for developers. Built by the React Email team (founders: Zeno Rocha, Bu Kinoshita, Jonni Lundy). Send transactional and marketing emails at scale with a modern API. Went through Y Combinator 2023, raised $18M Series A from Andreessen Horowitz in Dec 2024.
Resend news
Launch Week 6: Automations, AI Email Editor, CLI 2.0, Custom Tracking Domains, React Email 6.0, Resend Forward
Shipped 5 major features and announced first Resend Forward conference
Resend acquires Briefer and Mergent to expand email automation and AI
Strategic acquisitions to build out automation and AI capabilities
Inboxes: Two-way email with receive functionality and Email Metrics API
Receive emails as structured data, managed dedicated IPs, Email Metrics API for engagement tracking
Passed 3 million users
Major milestone in user growth
Forward: Launch Week 2, marketing email product launch
Resend became multi-product company with marketing email support alongside transactional
Raised $18M Series A from Andreessen Horowitz
Led by a16z, 18 months after public launch
SOC 2 Type II compliance achieved
Enterprise security certification
Key features
RESTful API & SDKs
Supports Node.js, Python, PHP, Ruby, Go, Java, Rust, .NET
React Email Integration
Build email templates as React components; versions 5.0 and 6.0 support dark mode, Tailwind 4, and open-source email editor
Transactional & Marketing Email
Send password resets, receipts, notifications, and marketing campaigns
Domain Verification
Automated DMARC, DKIM, SPF, BIMI setup and monitoring
Inboxes
Receive inbound emails as structured data via webhooks; create addresses in code
Automations
Email automation workflows and trigger-based sending
Batch Email API
Send up to 100 messages per request
CLI (2.0)
Send emails from local React files, manage automations, listen to webhooks, 50+ commands
AI Email Editor
Built-in AI assistance for email composition
Email Metrics API
Track deliverability and engagement metrics
Dedicated IPs
Fully managed with automatic warmup and monitoring
Schedule Email API
Schedule emails for future delivery
Custom Tracking Domains
Branded link tracking and click analytics
Resend pricing
Transactional and marketing email have separate pricing. Free tier includes 3 inboxes. Batch limits: up to 100 emails per request.
| Plan | Price | What's included |
|---|---|---|
| Free | $0 | 3,000 transactional emails/month (100/day limit), 3 domains, 3 inboxes, 1,000 marketing contacts, basic support |
| Pro (Transactional) | $20-$35/month | 50,000-100,000 emails/month, no daily limit, 10 domains, 5 webhook endpoints, 100 AI credits/month, $0.90 overage per 1,000 emails |
| Scale (Transactional) | $90-$1,150/month | 100K-2.5M emails/month, 1,000 domains, dedicated Slack support, 10 webhook endpoints, 500 AI credits/month |
| Enterprise | Custom | 1M+ monthly emails, 99.99% uptime SLA, dedicated support, Single Sign-On, custom features |
| Pro Marketing | $40-$650/month | 5,000-150,000 contacts, unlimited segments, marketing analytics |
Pros & cons
Pros
- + Excellent React Email integration—templates as components in your codebase
- + Simple, modern API with SDKs across major languages
- + Strong focus on deliverability (DMARC, DKIM, SPF, BIMI, domain warming)
- + Inboxes and automations emerging for multi-directional email
- + Active product development (frequent launch weeks, acquisitions)
- + Generous free tier for startups and low-volume senders
Cons
- − Inboxes and automations are relatively new features
- − Marketing email pricing can become expensive at scale vs. dedicated ESPs
- − Free tier has strict 100 emails/day limit (not just monthly)
- − Smaller team than competitors; support scaled since 2024 Series A
Who is Resend best for?
- • JavaScript/React/Next.js teams who want email templates in version control like code
- • Products building product notifications and transactional email
- • Teams wanting modern email infrastructure without complex setup
- • Developers prioritizing developer experience over enterprise features
