Best Kai Alternatives in 2026
Updated
20 apps from AI email assistants ranked against Kai on the same published basis.
- 1Kai vs Mailbutler Smart Assistant
- 2Kai vs Perplexity
- 3Kai vs Spike
- 4Kai vs Fyxer
- 5Kai vs Serif
- 6Kai vs Superhuman Go
- 7Kai vs Mailtwine
- 8Kai vs OpenMailBot
- 9Kai vs Spark +AI
- 10Kai vs EmailOps
- 11Kai vs Kerna
- 12Kai vs MailCopilot
- 13Kai vs Demi
- 14Kai vs EmailAgent
- 15Kai vs MailFlow
- 16Kai vs Maillifier
- 17Kai vs MailMaestro
- 18Kai vs MailWise
- 19Kai vs Metis Mail
- 20Kai vs Needle
Kai alternatives compared
| # | App | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Mailbutler Smart Assistant | 6.8 | Free plan | $7/mo | Android, Browser, iOS, Linux, Mac, Web, Windows |
| 2 | Perplexity | 6.7 | Free plan | Android, API, iOS, Mac, Web, Windows | |
| 3 | Spike | 6.7 | Free plan | $4/mo | Android, iOS, Mac, Web, Windows |
| 4 | Fyxer | 6.6 | Free plan | $22.50/mo | API, iOS, Mac, Web, Windows |
| 5 | Serif | 6.6 | Free plan | $30/mo | iOS, Mac, Web, Windows |
| 6 | Superhuman Go | 6.6 | Free plan | $12/mo | Android, Browser, iOS, Mac, Web, Windows |
| 7 | Mailtwine | 6.5 | Android, iOS, Linux, Mac, Web, Windows | ||
| 8 | OpenMailBot | 6.5 | Free plan | Free | Linux, Mac, self-hosted, Web, Windows |
| 9 | Spark +AI | 6.5 | Free plan | $10/mo | Android, iOS, Mac, Windows |
| 10 | EmailOps | 6.4 | Free plan | Free | Linux, Mac, Windows |
| 11 | Kerna | 6.4 | Free plan | €12/mo | Mac, Web, Windows |
| 12 | MailCopilot | 6.4 | Free plan | Free | Linux, Mac, Windows |
| 13 | Demi | 6.3 | Free plan | $25/mo | Mac |
| 14 | EmailAgent | 6.3 | Free plan | Free | Web |
| 15 | MailFlow | 6.3 | Free plan | $12/mo | API, self-hosted, Web |
| 16 | Maillifier | 6.3 | Free plan | Free | self-hosted, Web |
| 17 | MailMaestro | 6.3 | Free plan | $12/mo | Browser, Web |
| 18 | MailWise | 6.3 | Free plan | £15/mo | Web |
| 19 | Metis Mail | 6.3 | Free plan | $9.58/mo | self-hosted, Web |
| 20 | Needle | 6.2 | Free plan | Free | Web |
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Questions about Kai alternatives
What is the best alternative to Kai?
Mailbutler Smart Assistant, number 1 in AI email assistants with a score of 6.8 out of 10. The others here: Perplexity, Spike, Fyxer and 16 more.
What is the best free alternative to Kai?
Mailbutler Smart Assistant is the best-ranked alternative with a free plan. 19 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.