HTML version: https://cooperemail.com/compare

Cooper Email is an email API that gives each AI agent its own inbox. [Free is $0 and includes 5 inboxes and 5,000 emails a month](/pricing).

Comparisons

# Pick the mail stack that matches the job.

Each page cites a public source and the date it was retrieved. Prices move. If a number here and the vendor page disagree, the vendor page is the one to trust.

- [Cooper Email vs AgentMail (2026) Cooper Email vs AgentMail in 2026: published plans, limits, and agent features side by side, with sources and the date they were retrieved.](/compare/agentmail)
- [Cooper Email vs Resend Factual comparison of Cooper Email, an agent inbox, and Resend, a transactional email API. Prices retrieved 2026-11-05. Resend figures were not recounted on 2026-11-05; they still match the 2026-10-10 record.](/compare/resend)
- [Cooper Email vs Twilio SendGrid Factual comparison of Cooper Email and Twilio SendGrid Email API pricing, retrieved 2026-09-27.](/compare/sendgrid)
- [Cooper Email vs the Gmail API Factual comparison of Cooper Email and the Gmail API for agent mail, using Google’s quota page.](/compare/gmail-api)
- [Cooper Email vs Mailgun Factual comparison of Cooper Email and Mailgun sending plans, retrieved 2026-09-27 from mailgun.com/pricing.](/compare/mailgun)