Superhuman vs Shortwave: Which AI Email Client Wins?

Superhuman vs Shortwave comes down to reach versus focus. Superhuman runs on Mac, iOS, Android, Windows, and the web, and works with both Gmail and Outlook. Shortwave runs only on Gmail. Pick Superhuman for broad platform support. Pick Shortwave if you live in Gmail and want deep AI.

Both apps replace your normal email app with a faster, AI-native one. Both add AI summaries, AI drafts, and smarter triage. The real split is who they serve.

Superhuman is now a Grammarly product after the June 2025 acquisition. That change moved its pricing under Grammarly's plans. Shortwave stays independent and Gmail-first. This guide shows which one fits your work.

Superhuman vs. Shortwave: Side-by-Side

Platforms and Email Support

Superhuman supports far more platforms than Shortwave. Superhuman runs on Mac, iOS, Android, Windows, and the web, and connects to both Gmail and Outlook. Shortwave runs on Gmail only and does not support Outlook, IMAP, or Exchange.

This is the first filter for most buyers. If your company runs Microsoft 365, Shortwave is out on day one. It connects through the Gmail API and nothing else.

Superhuman fits mixed environments. A team with some Gmail users and some Outlook users can standardize on one app. That matters when you want the same shortcuts and AI everywhere.

• Superhuman: Mac, iOS, Android, Windows, web
• Superhuman: works with Gmail and Outlook
• Shortwave: Gmail only, no Outlook or IMAP

AI Features Head to Head

Both apps put AI at the core, but they aim it differently. Superhuman uses AI to triage and speed you up, with Auto Summarize on threads and Split Inbox to sort mail into lanes. It also drafts and rewrites replies in your voice.

Shortwave centers the app on an AI assistant. You can ask it to summarize, search in plain English, and draft replies. Its natural-language search is a standout for finding old mail fast.

In our hands-on content-automation work across sites, the pattern we see is that AI drafting saves the most time on repetitive, similar replies, not one-off notes. Both apps handle that repeat work well. The gap is in reach, not raw AI quality.

• Superhuman: Auto Summarize, Split Inbox, AI draft and reply
• Shortwave: AI assistant, plain-English search, AI drafts, scheduled send
• Both learn your tone for on-brand replies

Speed and Daily Workflow

Superhuman is built for speed above all else. It is keyboard-first, with a command palette and shortcuts for nearly every action. Power users clear large inboxes without touching the mouse.

Shortwave is fast too, but its design leans on the AI assistant to move you through mail. You lean on search and summaries more than on raw keyboard speed.

The right pick depends on how you work. Keyboard-driven users tend to prefer Superhuman. People who want an assistant to do the sorting tend to prefer Shortwave.

• Superhuman: sub-100ms feel, keyboard shortcuts, command palette
• Shortwave: assistant-led triage and search
• Both feel faster than stock Gmail or Outlook

Pricing and Free Tier

Shortwave has a limited free tier; Superhuman does not. Superhuman is a per-seat monthly subscription, billed monthly or annually, with a free trial but no permanent free plan. Confirm current pricing on Superhuman's site, since plans moved under Grammarly.

Shortwave offers a limited free tier, then tiered paid plans. A Max tier sits at the top of its range, reported up to about $120 per seat per month. Treat that figure as reported and verify it on Shortwave's page.

Budget-first buyers who want to try before paying will prefer Shortwave's free tier. Buyers who value platform reach may accept Superhuman's paid-only model. Always check the vendor's own pricing page before you buy.

• Superhuman: paid-only, per-seat, free trial (verify current price)
• Shortwave: limited free tier plus tiered paid plans
• Shortwave Max: reported up to ~$120/seat/mo (verify)

→ Compare per-token pricing for every AI model

Switching Effort and Setup

Switching to either app is low effort because both keep your existing mailbox. Superhuman and Shortwave connect to your live Gmail or Google account and read your current mail. You do not export or move messages, so your archive, labels, and threads stay in place.

Shortwave sets up in minutes on a Gmail account. You grant access, and it indexes your mail to power search and AI. Superhuman adds a short guided onboarding that teaches its shortcuts, which costs more time upfront but pays back in daily speed.

If you leave either app, your mail stays safe in Gmail or Outlook. You are changing the app you read mail in, not the inbox itself. That keeps the risk of a trial low.

• Both connect to your live mailbox; no migration or export
• Shortwave: quick Gmail grant, then it indexes your mail
• Superhuman: short shortcut-training onboarding upfront

Which Fits Your Workflow

The right app depends on volume, team size, and provider. A high-volume solo sender who lives in Gmail and wants an assistant to summarize threads and find old mail will lean Shortwave. Someone who clears hundreds of messages a day by keyboard will lean Superhuman.

A mixed team with both Gmail and Outlook users can only standardize on Superhuman. Shortwave cannot onboard the Outlook half of the team. That single fact often ends the debate for larger companies.

A solo Gmail user testing AI email for the first time can start on Shortwave's free tier at no cost. A keyboard-driven power user who already relies on shortcuts will feel at home in Superhuman fast.

• High-volume Gmail solo, assistant-led: Shortwave
• Keyboard power user clearing hundreds a day: Superhuman
• Any Outlook user on the team: Superhuman is the only fit

Data, Privacy, and AI Processing

Both apps send parts of your email to AI models to draft, summarize, and search. That means your message text is processed by their systems and their model providers. Review each vendor's privacy and data-handling terms before you connect a work account.

Shortwave indexes your Gmail to power AI search and summaries. Superhuman, now under Grammarly, processes mail for its AI features under Grammarly's policies. Check whether your company allows this for regulated or sensitive mail.

In practice, teams that handle regulated mail should confirm what a tool stores, for how long, and whether AI is on by default before routing real customer email through it.

• Both process your mail text through AI models
• Shortwave indexes Gmail; Superhuman follows Grammarly's terms
• Verify storage and retention before using for sensitive mail

Who Should Pick Each One

Choose Superhuman if you need broad platform support or use Outlook. Its Mac, iOS, Android, Windows, and web apps let a mixed team share one workflow. Keyboard power users get the fastest triage here.

Choose Shortwave if your whole team runs Gmail and you want the deepest AI assistant. Its plain-English search and free tier lower the risk of trying it. Its assistant shines when you need to find an old thread or catch up on a busy label fast.

There is real overlap for solo Gmail users, who could be happy with either app. Let budget and working style break that tie. Start on Shortwave's free tier if cost comes first, or trial Superhuman if raw keyboard speed matters more.

Both are strong AI-native clients. The decision is usually settled by your mail provider and your budget, not by AI quality alone.

• Pick Superhuman: Outlook users, mixed platforms, keyboard-first work
• Pick Shortwave: Gmail-only teams, assistant-led triage, free-tier trials

The Verdict

Superhuman wins on reach; Shortwave wins on Gmail-only depth and a free tier. There is no single winner for everyone. The choice usually comes down to your mail provider first, then your budget and how fast you work.

Pick Superhuman if you use Outlook, mix platforms, or want the fastest keyboard-driven triage across Mac, Windows, Android, iOS, and web. Its onboarding costs time upfront but rewards heavy senders with real daily speed.

Pick Shortwave if your team is all-Gmail, you want a central AI assistant with plain-English search, and you want to start on a free tier.

When the other wins: Shortwave beats Superhuman for a Gmail-only user who wants assistant-led search on a budget, while Superhuman beats Shortwave the moment one Outlook mailbox joins the team.