Tomorrow vs. Superhuman: speed, or an inbox that does the work
Superhuman makes you fast at email. Tomorrow does the email — preparing replies, follow-ups, and automations for your approval — and it runs on any mailbox, not just Gmail and Outlook.
You want an inbox that prepares and automates work, or you’re on a custom domain, Proton, or Fastmail that Superhuman can’t connect to.
You’re on Gmail or Outlook, you process huge volumes of mail by hand, and raw keyboard speed is the single thing you care about most.
The honest summary
Superhuman earned its reputation for a reason: it’s a beautifully fast, keyboard-driven email client, and it has added AI features for drafting and triage. If your goal is to move through a Gmail or Outlook inbox as fast as humanly possible, it’s excellent at that.
But “fast at doing it yourself” is still doing it yourself. Tomorrow is built around a different promise: the inbox prepares the work — the reply, the follow-up, the invoice, the task — and you approve it. And it isn’t limited to two providers.
Feature comparison
| Feature | Tomorrow | Superhuman |
|---|---|---|
| Works on Gmail | Yes | Yes |
| Works on Outlook | Yes | Yes |
| Custom domains over IMAP/SMTP | Yes | No |
| Proton, Fastmail, any mail server | Yes | No |
| Keyboard-first speed | Yes | Yes |
| AI-drafted replies in your voice | Yes | Yes |
| Prepares actions before you ask | Yes | No |
| Plain-language workflow automation | Yes | No |
| Connects to outside tools (invoices, tasks) | Yes | No |
| Approval before any action runs | Yes | Yes |
Where Tomorrow pulls ahead
It does the work, not just the keystrokes. Superhuman shortens the path to sending an email you write. Tomorrow drafts it for you, chases the threads that go quiet, and turns “email this client an invoice” into a real action — all approval-gated.
It works on any email address. Superhuman covers Gmail and Outlook. Tomorrow speaks IMAP and SMTP, so it also runs on Proton, Fastmail, and custom domains on any server.
It automates outside the inbox. Through 1000+ integrations — plus any tool with an API and a browser fallback — Tomorrow can act in the tools you already use. Superhuman stays a mail client.
Where Superhuman is still a fine choice
If you’re a high-volume Gmail or Outlook user whose whole workflow is built around keyboard speed and a snappy client, Superhuman delivers that polish. Tomorrow’s advantage is for people who’d rather the inbox prepare the work than race through it — and for anyone Superhuman simply can’t connect to.
Frequently asked questions
What is the best Superhuman alternative?
Tomorrow is a strong Superhuman alternative for people who want AI automation, not just speed. It works on any IMAP mailbox (including custom domains, which Superhuman does not support) and prepares replies and workflows for your approval.
Does Superhuman work with custom domains?
Superhuman supports Gmail and Outlook. It does not connect to Proton, Fastmail, or arbitrary custom domains over IMAP. Tomorrow connects to any mailbox that speaks IMAP and SMTP.
Is Tomorrow cheaper than Superhuman?
Superhuman is positioned as a premium, speed-first product. Tomorrow focuses on AI automation rather than per-seat premium pricing — see the pricing page for current plans before you connect a mailbox.
What does Tomorrow do that Superhuman does not?
Superhuman optimizes how fast you process email manually. Tomorrow prepares the work for you — drafting replies, chasing follow-ups, and building automations from plain language — then executes only with your approval, on any mailbox.
The AI inbox that works on any email address
Connect any mailbox — Gmail, Outlook, Fastmail, or a custom domain — and let Tomorrow prepare your replies and automations, with your approval before anything sends.
