Superhuman is the obvious benchmark for premium email. It is polished, fast, and built for people who live in their inbox. Postscript is not trying to win by pretending that is untrue.
The difference is the product bet. Superhuman starts from speed and workflow polish. Postscript starts from reviewable AI state: labels with reasons, drafts with provenance, tone memory that can be corrected, and approval-first behavior.
| Dimension | Superhuman | Postscript |
|---|---|---|
| Best for | Premium email speed and polish | Review-first AI inbox workflows |
| Providers | Gmail and Outlook | Gmail and Outlook |
| AI drafts | Yes; tier details should be verified | Yes; approval-first draft suggestions |
| AI labels | Yes; tier details should be verified | Yes; stored reasoning and corrections |
| Auto-send stance | Verify current docs | No auto-send by default |
| Audit trail | Verify current docs | Model output, prompt version, input hash, confidence, reason, feedback |
| Pricing | Starter, Business, Enterprise | Do not state until public pricing exists |
Who Superhuman is right for
Choose Superhuman if the main job is moving through email faster in a mature premium client. Its public materials emphasize Gmail and Outlook support, AI-native email, reminders, shared conversations, team comments, and higher-tier integrations.
Who Postscript is right for
Choose Postscript if your concern is not just whether AI can draft a reply, but whether you can inspect and correct the AI system around your inbox. Postscript's architecture stores AI outputs with reasons, confidence, prompt version, model name, feedback, and correction history.
Pricing
Superhuman's help docs list Starter at $30/month or $300/year, Business at $40/month or $396/year, and Enterprise by sales contact as of the pricing page's April 2026 update. Re-check official pricing before making a purchase decision. Postscript pricing is not public in this repository, so this page should not invent it.
Sources
FAQ
Does Superhuman work with Gmail and Outlook?
Yes. Superhuman's public product pages and docs describe Gmail and Outlook support.
Is Postscript better than Superhuman?
Not universally. Superhuman is stronger if you want a mature premium email client optimized for speed. Postscript is the better fit if you want AI email with visible reasoning, approval-first drafts, and durable feedback loops.
What is the best Superhuman alternative?
For review-first AI email, Postscript is the direct alternative. For Gmail-first organization, Shortwave is also worth researching. For triage without a full client switch, SaneBox may fit.