Best MailFlow Alternatives in 2026

Updated October 2026

20 apps from AI email assistants ranked against MailFlow on the same published basis.

MailFlow alternatives compared

#	App	Score	Free plan	From	Runs on
1	Perplexity	7.9	Free plan	$20/mo	Android, API, iOS, Mac, Web, Windows
2	Mailbutler Smart Assistant	7.8	Free plan	$7/mo	Android, Browser, iOS, Linux, Mac, Web, Windows
3	Spike	7.8	Free plan	$4/mo	Android, iOS, Mac, Web, Windows
4	Spark +AI	7.7	Free plan	$10/mo	Android, iOS, Mac, Windows
5	Superhuman Go	7.6	Free plan	$12/mo	Android, Browser, iOS, Mac, Web, Windows
6	Mailtwine	7.4	No	—	Android, iOS, Linux, Mac, Web, Windows
7	Shortwave	7.1	No	$30/mo	Android, iOS, Mac, Web, Windows
8	Inbox Zero	6.9	No	$20/mo	Android, API, Browser, iOS, self-hosted, Web
9	Kai	6.9	No	$20/mo	Android, iOS, Mac, Web
10	Maylee	6.9	No	$17/mo	Android, iOS, Mac, Web, Windows
11	MorningZero	6.9	No	$15/mo	Android, Linux, Mac, Web, Windows
12	Drag	6.8	No	$12/mo	Android, API, Browser, iOS, Mac, Web, Windows
13	Missive	6.8	No	$14/mo	Web, Windows, Mac, iOS, Android
14	Revo	6.7	No	$22.50/mo	Android, iOS, Web
15	Superhuman Mail	6.7	No	$2.08/mo	Web, Windows, Mac, iOS, Android
16	Serif	6.6	No	$30/mo	Web, Windows, Mac, iOS
17	Quell	6.5	No	—	Web, Android
18	MailMaestro	6.2	Free plan	$12/mo	Browser, Web
19	MailWise	6.2	Free plan	£15/mo	Web
20	EmailAgent	6.1	Free plan	Free	Web

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What is the best alternative to MailFlow?

Perplexity, number 1 in AI email assistants with a score of 7.9 out of 10. The others here: Mailbutler Smart Assistant, Spike, Spark +AI and 16 more.

What is the best free alternative to MailFlow?

Perplexity is the best-ranked alternative with a free plan. 8 of the 20 alternatives here publish a free plan on their own pricing pages.

How are these alternatives ranked?

Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation.