Quick answer
Superhuman, Shortwave, and Gmail's own AI features are all racing to make email management automatic rather than manual — but they're not competing for the same customer.
Email hasn't fundamentally changed in decades, but the fight over who gets to sit on top of your inbox with an AI layer has gotten genuinely interesting. Superhuman built its reputation on speed and status before AI was the story. Shortwave came at it from the AI-assistant angle first. And Gmail, which already has more inboxes than anyone, has been steadily wiring AI directly into the product most people never chose to leave.
Superhuman: speed, now with AI triage
Superhuman's whole pitch has always been keyboard-driven speed and a premium feel — the "fastest email experience ever made" positioning, backed by a subscription price that filters for people who value time over cost. Its AI additions layer on top of that: auto-categorization, AI-drafted replies matched to your tone, and summarization of long threads, all wrapped in the same fast, minimal interface it was already known for.
The AI here is in service of speed, not a replacement for the product's original identity. It's still aimed squarely at busy professionals who'll pay to shave minutes off every email session.
Shortwave: AI as the actual assistant, not a feature
- Built its product around an AI chat interface that can search, summarize, and act on your email in natural language from the start, rather than adding AI to an existing fast-email product.
- Leans on automatic thread summarization and bundling to reduce inbox volume, positioning itself as much as an assistant that manages your inbox as a client you read it in.
- Smaller company, smaller budget than Google, but faster to ship experimental AI-first workflows because it isn't protecting a legacy user base's expectations.
Gmail: AI for a billion inboxes
Google's advantage isn't creativity — it's reach. Gemini-powered features rolling into Gmail (smart replies, summarization, drafting assistance) reach essentially everyone who already has a Gmail account, with zero switching cost. The features individually may lag what a dedicated AI-email startup ships first, but "already installed on every device you own" is a distribution advantage neither Superhuman nor Shortwave can match.
Where each one actually wins
Superhuman wins for people who already valued a fast, premium email experience and want AI to extend that, not redefine it. Shortwave wins for people willing to rethink email as a conversation with an assistant rather than a list of messages to process. Gmail wins by default, for everyone who wants better email without switching anything — which, numerically, is nearly everybody.
Does switching email clients for AI features actually make sense?
For most people, no — Gmail's built-in AI closes most of the practical gap for free, and switching clients means re-training muscle memory and, in some cases, re-authenticating every account you manage. Switching makes more sense for people whose email volume is genuinely a job-shaped problem: heavy senders, people managing multiple inboxes, or anyone who has already outgrown what stock Gmail or Outlook offers.
Every AI email tool reads your email to work. That's the whole point, but it's also the whole risk — check what a third-party client actually does with your message content and metadata before connecting a work account.
Related reading
Bottom line
This isn't really a three-way fight for the same users. Superhuman is selling speed to people who'll pay for it, Shortwave is selling a genuinely different way to work an inbox, and Gmail is quietly making the whole category less necessary for most people by just being good enough, for free.
