OpenMail vs Resend
OpenMail and Resend are both developer tools tools. OpenMail is aimed at developers and small businesses, while Resend is aimed at developers. Both have a free plan.
| Pricing | Freemium | Freemium · $20 |
| Starting price | Not published | $20/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Built for | Developers, Small businesses | Developers |
| Platforms | web | web |
| Country | LT | US · 2023 |
| Rating | — | — |
Choose OpenMail if
Developers building AI agents that need their own email address to receive, thread and answer mail.
- Built for receiving and replying, not only sending
- Each inbox has its own sending reputation
- Free plan needs no credit card
Look elsewhere if: Teams that mainly send marketing or transactional email at high volume (Resend, MachineMail).
Choose Resend if
Developers and startups who want transactional email that is a pleasure to integrate.
- Best developer experience in email APIs
- React Email templates are a joy
- Free tier for small projects
Look elsewhere if: High-volume senders needing advanced deliverability tooling or full marketing automation.
OpenMail vs Resend pricing
OpenMail
- Free€0/mo3 inboxes, 3,000 emails/mo (100/day), 3 GB, openmail.sh addresses
- Pro€9/mo10 inboxes, 10,000 emails, custom domains; then usage-based
- EnterpriseCustomDedicated sending IPs, SSO, 1-hour SLA, custom DPA
Resend
- Free$03,000 emails/mo, 100/day, 3 domains, 30-day retention
- Pro$20/mo50,000 emails/mo, 10 domains, no daily limit
- Scale$90/mo100,000 emails/mo, 1,000 domains, dedicated IP add-on
- EnterpriseCustom99.99% SLA, dedicated CSM, SSO included
OpenMail · Key features
- One API call or CLI command creates a dedicated agent inbox
- Inbound mail delivered in real time over webhook or WebSocket
- Full email threading so agents reply in the same conversation
- PDF, CSV and image attachments parsed into plain text (extra cost)
- Allow and block rules per address or domain
- Custom domains with DKIM, SPF and DMARC on Pro
Cons
- Pricing page mixes $9 and €9; overage rates are in euros
- Free plan caps sending at 100 emails a day
- Free plan appends a "Sent with OpenMail" footer
Resend · Key features
- Simple REST API and SDKs for Node, Python, Go, Ruby, PHP, Java
- React Email for component-based templates
- Domains with DKIM/SPF guidance and dedicated IPs
- Webhooks, idempotency keys and batch sending
- Broadcasts for marketing with audiences and unsubscribe
- Logs, analytics and suppression lists
Cons
- Short log retention on lower plans
- Fewer advanced features than SendGrid
- Younger provider; reputation building
OpenMail vs Resend: FAQ
Do OpenMail and Resend have a free plan?
Yes, both OpenMail and Resend have a free plan; paid plans add more usage and features.
Which is better for small businesses, OpenMail or Resend?
OpenMail lists small businesses as a core audience, while Resend is aimed more at developers.