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Best Kai Alternatives in 2026

12 apps from AI email assistants ranked against Kai on the same published basis.

  1. 1
    Spark +AI Free plan AndroidiOSMacWin $10/mo9.7
    Kai vs Spark +AI
  2. 2
    Mailbutler Smart Assistant Free plan AndroidextensioniOSLinuxMac $7/mo9.6
    Kai vs Mailbutler Smart Assistant
  3. 3
    Superhuman Go Free plan AndroidextensioniOSMacWeb $12/mo9.4
    Kai vs Superhuman Go
  4. 4
    MorningZero Free trial AndroidLinuxMacWebWin $15/mo8.5
    Kai vs MorningZero
  5. 5
    Missive WebWinMaciOSAndroid $14/mo8.4
    Kai vs Missive
  6. 6
    EmailOps Free plan LinuxMacWin Free8.0
    Kai vs EmailOps
  7. 7
    Inbox Zero Free trial AndroidapiextensioniOSself-hosted $20/mo8.0
    Kai vs Inbox Zero
  8. 8
    Shortwave Free trial AndroidiOSMacWebWin $30/mo8.0
    Kai vs Shortwave
  9. 9
    MailMaestro Free plan extensionWeb $12/mo7.7
    Kai vs MailMaestro
  10. 10
    Superhuman Mail WebWinMaciOSAndroid $2.08/mo7.6
    Kai vs Superhuman Mail
  11. 11
    Metis Mail Free plan Web $12/mo7.0
    Kai vs Metis Mail
  12. 12
    Quell WebAndroid 6.9
    Kai vs Quell
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