7 Superhuman Alternatives in 2026 (And Why the Inbox Now Costs a Business Seat)

If you searched for Superhuman alternatives, you probably did not do it because the keyboard shortcuts stopped working. You did it because of a line on the plans page.

The real reason people leave Superhuman

Superhuman is no longer a fast email client with a price. It is Grammarly's AI suite, and the inbox is one product inside it. On Superhuman's own plans page, the row labelled Superhuman Mail — the client itself — only appears on Business and Enterprise. Business is 33 euros per member per month billed annually, or 40 euros per member per month if you pay monthly. The Free and Pro tiers buy you Go, the assistant, plus writing help across your apps. They do not buy you the inbox.

That is the checkable thing most roundups skip. If you are one person who wanted the fastest mail client in the world, the entry ticket is now a business seat, quoted at the annual rate by default, with a 21 percent penalty for paying month to month.

Two more axes decide the bill. First, the unit: Superhuman charges per member, per month. Not per task, not per AI run, not per credit. Add a fifth teammate who reads mail twice a week and you pay a fifth full seat. Second, the provider: Superhuman Mail is, in its own words, built for teams that use Gmail or Outlook. If your mail lives on IMAP, iCloud, Fastmail or a self-hosted server, the question of price never comes up.

So there are really three different exits, and they lead to different tools: cheaper per seat, different provider, or a different unit of billing entirely.

How I picked these

Every price, limit and licence below comes from the vendor's own site or its public repository. No G2, no Capterra, no roundup sites quoting each other's stale numbers. If I could not source a tool first-party, I dropped it rather than guess.

Each entry names what the money is charged against, states whether the headline number is the annual or the monthly rate, and carries one honest catch. That includes the last entry, which is ours, and which I have marked clearly.

One note on currency: Superhuman and several others display local pricing, so the euro figures above are what a European buyer sees. Check your own region before you budget.

The short version

• Shortwave — the closest like-for-like AI inbox. 30 dollars per seat per month, Gmail sign-in only.
• Missive — shared inboxes and email as a team surface. 14 to 36 dollars per user per month, and the annual price is the same as the monthly one.
• Spark — the only one here with a genuinely usable free tier and unlimited accounts.
• HEY — a flat yearly fee and a different theory of email, if you are willing to change address.
• Mimestream — native macOS Gmail at 49.99 dollars a year, no AI theatre.
• Thunderbird — free, open source, donation funded, explicitly not training on your mail.
• Notis — ours. Not an email client at all. Billed per task, not per seat.

1. Shortwave

Shortwave is the tool people actually mean when they say they want Superhuman but cheaper. It is a full AI email client with search, drafting, autopilot-style triage and an assistant that reasons over your threads.

Pricing is per seat, billed monthly, on Shortwave's pricing page: Business at 30 dollars per seat per month, Premier at 45, Max at 120. Notice what the tiers actually gate — AI usage. Business is described as roughly 150 to 300 daily AI requests, a 50-thread cap per AI search, three AI-powered filters and five years of AI search history. Premier roughly doubles the usage and lifts the history cap; Max multiplies it about sixfold and runs the strongest models. So the axis is seats times AI volume, which is a more honest structure than a flat seat fee if your team's AI use is uneven — and a more expensive one if it is heavy.

The catch: Shortwave requires a Gmail or Google Workspace account to sign in. Its own documentation is blunt that Outlook.com, Microsoft 365 and Exchange accounts are not supported, and the workaround is forwarding into Gmail — which means replies leave from your Gmail address. If you left Superhuman because it only speaks Gmail and Outlook, Shortwave is a step backwards, not forwards.

2. Missive

Missive treats email as a place where a team works together rather than a place where one person is fast. Shared inboxes, internal comments threaded next to the message, assignment, rules. If the reason Superhuman is not working for you is that your support@ or sales@ address is a mess, this is the honest answer.

Missive's pricing is per user per month: Starter at 14 dollars for up to five users, Productive at 24 for up to fifty, Business at 36 for unlimited. The unusual part, and the reason it deserves a mention: the yearly and monthly rates are the same number. There is no annual discount to model and no annual commitment to be trapped by. Automation is capped as a count of rules — basic rules on Starter, up to a thousand on Productive and Business.

AI is deliberately unbundled. Missive supports multiple providers, Anthropic, OpenAI and Gemini, and you either buy Missive AI credits or bring your own API key. That is cheaper if you already have keys and more work if you do not.

The catch: the seat tiers double as user caps, so a growing six-person team is pushed from 14 to 24 dollars per user — a 71 percent jump per person triggered by one hire. And if you are a solo operator, you are paying for collaboration machinery you will never open.

3. Spark

Spark, from Readdle, is the only tool in this list where the free tier is a real product rather than a demo. According to Spark's pricing page, Free gives you the smart inbox, unlimited email accounts, smart notifications and a calendar. Unlimited accounts on a free plan is the specific thing Superhuman will never offer you.

Paid tiers are per user: Plus at 10 dollars monthly or 120 dollars annually, which works out to about 8.25 a month, roughly 17 percent off; Pro at 20 dollars monthly or 240 annually, about 16.58 a month. Plus adds the AI assistant and 40 AI meeting notes a month; Pro makes meeting notes unlimited and adds read statuses, HubSpot and a CLI with triage access.

Note the third unit hiding in there. Seats gate the plan, but AI is metered separately in credits, and going over means buying a one-time add-on or waiting for the monthly reset. Team storage is capped too, at 10 GB per member on the paid tiers.

The catch: credits. A seat price plus a credit meter means your bill is only predictable until the month you actually lean on the AI, and the fastest way to burn credits is exactly the heavy triage workload that made you want an AI inbox.

4. HEY

HEY is the only entry that refuses the whole premise. It is not a client bolted onto your existing mailbox; it is a mail service with strong opinions — screening every first-time sender, separating receipts and newsletters from real correspondence, blocking tracking pixels by default.

The billing unit is different too. HEY for You is 99 dollars per year, flat, per person, with 100 GB of storage and a @hey.com address. HEY for Families is 179 dollars per year for up to five people. If you want your own domain, HEY for Domains is 12 dollars per user per month, monthly billing, with the first user discounted to 10. For one person that is roughly 8.25 dollars a month against Superhuman Business at 33 euros a member.

The catch: you have to move. HEY is your mail host, not a nicer window onto Gmail, so switching means changing address or pointing a domain at them, and leaving later means moving again. Personal-plan users also get a @hey.com address rather than their own domain unless they pay for the domain product. That is a real switching cost, and it is the reason HEY is either an easy yes or an instant no.

5. Mimestream

Mimestream is the anti-Superhuman: a native macOS client built specifically on Gmail's API, by a former Apple Mail engineer, that feels like a Mac app instead of a website in a frame. Labels, filters, categories and multiple send-as addresses all behave the way Gmail actually behaves.

Its pricing is 49.99 dollars a year or 4.99 a month, covering all your Google accounts on up to five devices, with Family Sharing included on the individual plan. The Group plan is the same 49.99 a year per seat with centralised billing. There is a 14-day trial with no credit card. Against a 33 euro per member Business seat, that is a difference of an order of magnitude for the part most people wanted — a fast, correct, native inbox.

The catch: two hard walls. macOS only, so no Windows, no Linux, and no web fallback when you are on someone else's machine; and Google accounts only, so Outlook and IMAP users are out. It also does not pretend to be an AI assistant, which is a feature if you wanted speed and a dealbreaker if you wanted drafting.

6. Thunderbird

Thunderbird is the licence answer. It is a free email application, free forever, open source and funded by user donations, and the project states plainly that it does not collect personal data, sell ads in your inbox, or secretly train AI with your private conversations. That last clause is the reason it belongs in a list about an AI email suite. The project's about page states that Thunderbird is Free and Open-Source Software under MPL 2.0, which means its code is available to see, modify, use, and share freely, and that its licence ensures it will remain free forever. That is auditable rather than a trust-us statement in a marketing page.

It also has no provider restriction at all. IMAP, Exchange, Gmail, your own server, several accounts in a unified inbox. Nothing about your mail host disqualifies you.

The paid layer, Thunderbird Pro, bundles a hosted mail service called Thundermail with scheduling and encrypted file sending, and is still in Early Bird Beta being released in waves from a waitlist as of the 2026 updates on the project blog.

The catch: nothing here triages your inbox for you. Thunderbird replaces Superhuman's client, its zero-cost and its data posture, but not its assistant — and the hosted Pro layer you might use to close that gap is not generally available yet.

7. Notis

Disclosure: Notis is our product. It is last on this list on purpose, and it is the least like-for-like replacement here.

Notis is not an email client. There is no inbox to open, no command palette, no split-second shortcut for archive. It is an assistant you message from WhatsApp, iMessage, Telegram, Slack or email, and reach from your coding agent through its MCP server, and it acts across 1,000-plus connected apps rather than one mailbox. It reads and sends your mail, but that is one tool among many, next to your calendar, Notion, documents, reminders and scheduled automations.

The billing unit is the reason it is in this list at all. Notis charges per task, not per seat. Its pricing page lists Pro at 20 dollars a month, Pro+ at 59 and Ultra at 149, with the plan price being an included usage budget — around nine cents for an average task, a cent or two for quick ones, roughly nineteen for heavy ones — which works out to roughly 230, 680 and 1,700 tasks a month. The Notis CLI is permanently free, with your agent, skills, memory and integrations inside Claude Code, Codex or Cursor, no credit card. So a light month costs less than a heavy one, which is the opposite of a seat.

The catch: if what you want is the fastest inbox on earth, Notis is the wrong tool and you should buy Shortwave or Mimestream. It has no email UI and no keyboard-driven triage. The free tier is the CLI only — messaging from WhatsApp and the rest starts at 20 dollars a month. It is not open source and cannot be self-hosted; it is managed cloud only. And there is no Notis mobile app; it deliberately lives inside the apps already on your phone, which some people find elegant and others find like a missing product.

Which should you choose

Match the exit to the reason you are leaving.

1. You wanted the AI, not the price: Shortwave, if and only if you are on Gmail. It is the closest thing to Superhuman Mail that exists and it prices AI volume rather than pure headcount.
2. You wanted the speed, not the AI: Mimestream. Fifty dollars a year, native, correct, done.
3. Your team shares an inbox: Missive. Flat monthly-equals-annual pricing and no lock-in, but watch the user caps.
4. You have several accounts and no budget: Spark's free tier, upgrading to Plus only when you actually want the assistant.
5. You object to the whole model: HEY if you will change address, Thunderbird if you will not spend anything and want an auditable licence.
6. Email was never the real problem: Notis, ours, when the work spans mail, calendar, notes and a dozen other apps and you would rather message an assistant than sit in an inbox at all.

My verdict

Superhuman is still an excellent inbox. What changed is what you have to buy to reach it: the client now sits behind a business-tier seat inside a broader AI suite, quoted annually, and restricted to Gmail and Outlook. For a single person that is a hard sell against Mimestream at 49.99 a year or Shortwave at 30 a seat.

Before you switch, write down the unit you are willing to be billed on. Seats punish teams that grow. Credits punish the months you actually use the thing. Flat yearly fees punish nobody but assume you will stay. Per-task pricing, which is the model we chose, punishes heavy automation. There is no free lunch in any of these — there is only the axis whose failure mode you can live with.

Sources and research notes

Superhuman plan names, prices and the placement of Superhuman Mail on the Business tier come from superhuman.com/plans; the Gmail-and-Outlook statement from superhuman.com/mail. Shortwave from its pricing page and its provider documentation. Missive from missiveapp.com/pricing. Spark from sparkmailapp.com/pricing. HEY from hey.com/pricing. Mimestream from mimestream.com/pricing. Thunderbird from thunderbird.net and its about page. Notis from notis.ai/pricing, notis.ai/cli and notis.ai/integrations.

Prices were checked in August 2026 and vendors change them without warning. Several of these companies show local currency, so what you see may differ from what is quoted here. Verify on the vendor's page before you commit a card.