Alternatives

Alternatives to Zero

5 Email Clients & Email AI rivals, ranked by the same evidence-graded leaderboard — Zero itself ranks #2 with a PA Score of 28/100. Every “beats Zero on” below comes from a judged head-to-head round with cited evidence — see the methodology.

#1
AgentMail
AgentMail
PA Score 46/100vs Zero →
coverage
31.5/100
Beats Zero on: Subscribe to events via webhooks · Download a machine-readable API spec (OpenAPI or equivalent)
#3
Missive
Missive (Conference Badge Inc.)
PA Score 24/100vs Zero →
coverage
26.2/100
Beats Zero on: My team works shared inboxes together — shared accounts or team channels where everyone sees the same conversation state · Plug MCP servers into this product so it can use their tools
#4
Superhuman Mail
Superhuman (formerly Grammarly)
PA Score 24/100vs Zero →
coverage
29.8/100
Beats Zero on: Split my inbox into focused streams — important, team, newsletters, calendar invites — so triage happens in priority order, not arrival order · Define rules that trigger actions automatically on events
#5
Shortwave
Shortwave (ex-Google Inbox team)
PA Score 22/100vs Zero →
coverage
24.7/100
Beats Zero on: Plug MCP servers into this product so it can use their tools · Split my inbox into focused streams — important, team, newsletters, calendar invites — so triage happens in priority order, not arrival order
#6
Fastmail
Fastmail Pty Ltd
PA Score 14/100vs Zero →
coverage
17.8/100
Beats Zero on: My mail stays reachable over open protocols and standard formats — IMAP/JMAP/SMTP access and standards-based export — so no client can lock me in · Schedule an email to send later and undo a send within a grace window

Full leaderboard: Email Clients & Email AI arena →