Slashy vs Superhuman in 2026

Key takeaways

• Superhuman sells Mail two ways, and the ladder you land on decides the price. On its own, Starter is $25 per member per month billed annually, or $30 monthly. Inside the four-product suite of Mail, Grammarly, Docs and Go, the cheapest tier including Mail is Business at $33 annually, or $40 monthly.
• Slashy is a focused AI email product at $25 per user per month billed annually, or $30 monthly, with a seven-day trial that requires a credit card.
• Against standalone Mail, the two are the same price. The choice is not about money at that tier, it is about what each product is trying to be.
• Neither company publishes which email providers it supports on its homepage or pricing page. Confirm before you buy, especially on Outlook.
• Superhuman has scale and compliance behind it. Slashy has focus and a lower entry price.

Anyone comparing these two in 2026 is usually reacting to the same thing: Superhuman got more expensive and more complicated, and a wave of cheaper AI email products arrived while that happened. Slashy is one of the more credible ones.

We build a competing product, which we will get to at the end. Nothing below depends on that. All prices and features here come from each company’s own pricing pages, checked on August 4, 2026.

What Superhuman is now

This is the part most comparisons miss, and it changes the math.

Superhuman today sells a suite of four products. Mail is the email client people know. Grammarly is the writing assistant. Docs is a collaborative document tool. Go is an agent that works across applications.

The plan structure follows from that:

There are two price lists, which is where most comparisons go wrong.

Mail sold on its own, at superhuman.com/mail/pricing:

The suite, at superhuman.com/plans:

So you can buy the inbox by itself from $25, and the suite’s Free and Pro tiers are the ones that leave Mail out. Paying $33 buys Grammarly, Docs and Go alongside the inbox.

Whether that premium is worth it depends entirely on whether you would otherwise pay for a writing assistant and a docs tool. If you would, the bundle is strong value. If you only want a faster inbox, standalone Mail at $25 is the row to read.

What Slashy is

Slashy sells one thing: an AI email client. One plan, Professional, at $25 per user per month billed annually or $30 monthly, plus a bespoke Enterprise tier. The trial runs seven days and asks for a credit card up front.

What is included, per its own plan details: replies drafted in your voice, inline rewrites, voice drafts, reusable snippets, a personalized memory of your relationships and preferences, plain-language search, thread summaries, meeting preparation, reminders and follow-ups, intelligent labels and archiving, open tracking, calendar management, availability and team scheduling, unlimited connected inboxes, private team comments, and Mac, iPhone and web apps.

Two things stand out. Automations run on triggers rather than only on demand: when email arrives, before a meeting, or on a schedule you set. And you can reach it from iMessage and Slack, so the assistant is available in the apps where you are already typing.

Enterprise adds SSO and SCIM, a security review package, guided onboarding, a dedicated account manager and custom data controls.

Where the two actually differ

Feature lists overlap more than either would admit. Both draft in your voice, both summarize threads, both do calendar and scheduling, both do snippets, both offer plain-language search, both prepare you for meetings, both have an MCP surface, both do team collaboration on threads.

The real differences are these.

Scope. Superhuman is a bundle where email is one component. Slashy is an email product. That is the decision, and everything else follows from it.

Where the assistant lives. Slashy’s is reachable from iMessage and Slack. Superhuman’s lives in the Superhuman apps. If you want to fire off a request from your phone’s messaging app rather than opening another client, that is a genuine gap between them.

CRM. Superhuman Business reads HubSpot, Salesforce and Pipedrive inside the inbox. That is read-only, but for a sales team it removes a lot of tab-switching. Slashy does not publish an equivalent.

Compliance. Both hold SOC 2 Type 2. Superhuman additionally lists SAML SSO, SCIM, audit logs, data loss prevention and BYOK encryption at the higher tiers, while Slashy’s pricing page names SSO, SCIM and a security review package at Enterprise. The certification floor is the same; Superhuman publishes more detail about the controls sitting on top of it.

Scale. Superhuman claims over 40 million people and 50,000 teams across the suite. Slashy is a newer, smaller company. That cuts both ways: one is a safer institutional bet, the other is more likely to ship something you asked for.

What neither of them tells you

We went looking for which email providers each one supports, because for most buyers that is the first question and it decides the purchase.

Neither answers it where you would expect. Slashy’s homepage does not mention Gmail, Google Workspace, Outlook or Microsoft anywhere. Its pricing page has a FAQ entry titled “Which email providers does Slashy work with?” and another asking “Do I need to migrate away from Gmail?”, which implies a Gmail orientation without confirming what else is covered. Superhuman’s plans page does not name providers either.

If you run on Microsoft 365, ask both vendors directly and get the answer in writing before you pay. It is the single fastest way to waste a trial.

Which one should you pick

Choose Superhuman if you would pay for a writing assistant or a docs tool anyway, you need CRM context inside the inbox, or you have a procurement process that wants SOC 2 Type 2 and BYOK on the page before it will talk to you. At $33 the bundle is doing real work beyond email.

Choose Slashy if you want an inbox product and nothing else, or you value reaching the assistant from iMessage or Slack. Price is not the reason: at $25 it matches standalone Superhuman Mail exactly. You are buying focus, and focus is worth something.

Choose neither if your problem is not email. Both of these make one inbox faster. If the work arriving at your team is spread across Slack, Teams, Google Chat and WhatsApp as well as email, a faster email client leaves most of it untouched.

Where we fit

We build this+that, so treat this as disclosure rather than analysis.

We are not trying to be a better email client than either of these. We work across email and chat together, turn what arrives into tracked tasks with owners, run workflows on those messages, and keep a shared brain of what the team knows so the AI is answering from your business rather than guessing. It is free during the open beta.

If a faster inbox is what you need, one of the two above will serve you better than we will, and Superhuman in particular has a decade of polish we do not. If the problem is that work arrives in six places and falls through the gaps between them, that is the problem we picked.

Frequently asked questions

Can you buy Superhuman Mail without the rest of the suite?

Yes. Mail is sold on its own from Starter at $25 per member per month billed annually, or $30 monthly. Buying it inside the suite means Business at $33 annually or $40 monthly, which adds Grammarly, Docs and Go. Only the suite’s Free and Pro tiers leave Mail out.

Is Slashy cheaper than Superhuman?

Not at the tier most people should compare. Slashy is $25 per user per month billed annually, and standalone Superhuman Mail is also $25. It comes out cheaper only against Superhuman’s suite tier, and that higher price is buying Grammarly and Docs alongside the inbox.

Do either of them work with Outlook?

Neither publishes a provider list on its homepage or pricing page. Ask both directly before buying if you are on Microsoft 365.

Can you try them before paying?

Slashy offers a seven-day trial and requires a credit card to start it. Superhuman has a free plan, but it does not include Mail, so it does not let you evaluate the inbox.

Which has better security credentials?

They match on the certification that matters most, SOC 2 Type 2. Superhuman publishes more around it: SAML SSO, SCIM, audit logs, data loss prevention and BYOK encryption across its tiers. Slashy’s pricing page names SSO, SCIM and a security review package at Enterprise without detailing the rest.