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Agent inbox APIs compared head to head

21 like-for-like comparisons of email inbox APIs, each pair scored category by category with prices, facts and verdicts side by side. Pairs are made only when both do the same job.

  • 21 comparisons
  • 1 job
  • 7 ranked

Ranked

  1. #1AgentMail API + MCPBB74.9
  2. #2RobotomailB69.8
  3. #3MailSlurpB68.4
  4. #4mails.ai Agent EmailB66.7
  5. #5InboundB63.7
  6. #6CheramiC57.6
  7. #7InboxAPIC54.5

Agent inboxes 21

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Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.