The best Superhuman alternatives are Shortwave, Spark, Missive, Hey, Gmail with extensions and Zealos. Superhuman is the fastest email client ever shipped. Keyboard-first, sub-100ms interactions, and an onboarding process that genuinely teaches people to run their inbox. It's a premium price for speed on top of Gmail, and it stops at the inbox — it makes replying fast without reducing how much you have to reply to.
If you're leaving Superhuman, the right replacement depends on which part of it you were relying on. Shortwave is the closest like-for-like; the rest of this list trades breadth for depth in different directions. Every entry below includes the tradeoff, including ours.
| Tool | Best for | The tradeoff |
|---|---|---|
| Shortwave | Gmail users who want speed plus genuine AI triage. | Gmail only. |
| Spark | Small teams who handle shared mailboxes. | Less keyboard-optimized than Superhuman. |
| Missive | Support and ops teams working a shared queue. | Overkill for personal email. |
| Hey | People who want to change how email works rather than go faster at it. | You adopt their model, and their address, or you don't. |
| Gmail with extensions | People unwilling to pay for email. | You assemble and maintain it yourself. |
| Zealosus | People whose inbox problem is volume rather than speed — Zealos triages every message against CRM context and drafts the replies, so you approve twenty instead of writing two hundred. | It's not a full email client. It works alongside Gmail rather than replacing the interface you read mail in. |
The closest heir, built by ex-Google engineers with AI summarization and search at the centre.
Smart inbox with strong team features — shared drafts and inbox collaboration.
Team inbox with chat threaded alongside the email it's about.
An opinionated rethink of email — screening, paper trail, imposed structure.
Keyboard shortcuts, templates and a snooze extension get most of the way for free.
An AI sales assistant that unifies CRM, inbox, calendar and docs in one workspace, then runs AI agents on top for call prep, email triage, post call automation and prospecting.
Shortwave is the closest replacement and adds real AI triage. Spark and Missive win if the mailbox is shared. Zealos suits people whose problem is reply volume rather than typing speed.
Gmail with keyboard shortcuts enabled plus a snooze extension covers a surprising amount of it. Shortwave and Spark both have free tiers.