Mails.ai vs Resend
Both sit in email marketing. Here is how they differ on the things you can actually check.
On price: both start at the same $20 a month — Mails.ai on Pro, Resend on Pro. Both figures were read from the vendors' own pricing pages on the dates shown below.
Mails.ai
mails.ai
Gives an AI agent a real mailbox: inbound arrives as structured reply events carrying a prompt-injection score and sender reputation, with a six-category injection scanner on every message, dedicated IPs and an MCP server. Cold email is refused at the API rather than in the fine print.
Resend
resend.com
Modern transactional email API with React-based templates, a clean dashboard and SDKs for most stacks. Built by former Vercel engineers.
| Mails.ai | Resend | |
|---|---|---|
| Entry price | $20/mo | $20/mo |
| Entry plan | Pro | Pro |
| Paid annually | — | — |
| Price checked | 21 Sept 2026 | 6 Sept 2026 |
| Pricing model | Free plan | Free plan |
| Free plan | Yes | Yes |
| Category | Email Marketing | Email Marketing |
| Around since | 2025 | 2023 |
Every price here was read from the vendor's own pricing page, most recently on 21 Sept 2026. Entry tier only — vendors change pricing without notice.
Mails.ai vs Resend, answered
- Is Mails.ai cheaper than Resend?
- Neither. Both start at $20 a month at the entry tier.
- Do Mails.ai or Resend have a free plan?
- Both do. Mails.ai and Resend each publish an ongoing free tier rather than a time-limited trial.
- What is the difference between Mails.ai and Resend?
- Mails.ai: Gives an AI agent a real mailbox: inbound arrives as structured reply events carrying a prompt-injection score and sender reputation, with a six-category injection scanner on every message, dedicated IPs and an MCP server. Cold email is refused at the API rather than in the fine print. Resend: Modern transactional email API with React-based templates, a clean dashboard and SDKs for most stacks. Built by former Vercel engineers.
