Superhuman vs. Spark (2026): Which Email App Wins?

Last updated: 2026-07-06

Superhuman wins on raw speed and Auto Drafts if you send 50+ emails a day — nothing else processes email that fast. Spark wins on price ($5/month vs. $33-40/month) and cross-platform support, since Superhuman only works with Gmail and Outlook. Grammarly acquired Superhuman in mid-2025 and rebranded the parent company in October, but the pricing itself didn’t change because of the deal — worth knowing before you assume otherwise.

Quick Verdict

• Superhuman wins on speed and Auto Drafts — worth it if you send 50+ emails a day and email is central to your role.
• Spark wins on price (~$5-8/mo) and cross-platform support (Gmail, Outlook, iCloud, Yahoo, Exchange, IMAP).
• The Grammarly acquisition changed the branding, not the pricing — see the section below before assuming it got more expensive because of the deal.

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Comparison Snapshot

How I Evaluated This

I judged this on daily email volume as the deciding factor, since that’s what actually determines whether Superhuman’s speed pays for itself. I also went back and corrected the acquisition timeline and pricing framing below — the original details on the Grammarly deal had the date and the causality wrong. Every price was re-verified in July 2026.

Where Superhuman Wins

Raw speed. Nothing else is close. Superhuman is keyboard-driven from the ground up. Loading threads, switching between inboxes, searching — it’s instant. Once you learn the shortcuts, you move through email at a pace that feels almost unfair. Users consistently report 2-3x faster email processing. That’s not marketing copy… it’s what you feel after a week with it.

Auto Drafts. This is the feature that makes Superhuman worth the price for the right person. You open a thread that needs a reply. A draft is already there, written in your voice, based on the conversation context. You didn’t ask for it. You didn’t prompt it. It just appeared. You review, tweak one line maybe, send.

I set up something similar for a client using a custom Lindy agent — analyzing their last 25 sent emails to extract their voice, then pre-drafting all replies in that style. The first time they saw a draft that was immediately recognizable as theirs, they said “this is uncanny.” That’s what Superhuman’s Auto Drafts has gotten to. It’s trained on your full email history. It learns how you write.

Auto Labels triage. Every incoming email gets sorted before you open the app. Needs a response, waiting on someone, meetings, cold pitches. The work of triage is already done. This is the kind of thing that saves you the five mental decisions per email that add up across a day.

Keyboard shortcuts mastery. This one takes investment. There’s a learning curve. But if you commit to it, the shortcut system means you’re never reaching for the mouse. Archive, snooze, reply, move to folder — all without lifting your hands. It’s the email equivalent of a trading desk versus a regular PC.

Where Spark Wins

Price. The free tier of Spark does things that no free email client has any business doing. Smart Inbox sorts your email into Personal, Newsletters, and Notifications automatically. That’s real value at $0. Premium at $5/month (annual billing) adds AI Compose, thread summarization, and Spark’s My Writing Style feature, which learns your voice from your sent emails.

That’s a 6x price difference versus Superhuman’s entry plan. For someone sending 20 emails a day, Spark Premium does 80% of what matters at a fraction of the cost.

Cross-platform. This is Spark’s strongest card for a lot of people. Superhuman only works with Gmail and Outlook. If you’re on an iPhone and a Windows laptop… Spark. If you have a Google account and an iCloud account… Spark. If your team uses Exchange and you also have a personal Gmail… Spark.

Readdle (the company that makes Spark) has built native apps for Mac, iOS, Android, Windows, and web, and they’re all polished. That kind of cross-platform consistency is genuinely hard to build and Spark has had it for years.

The Gatekeeper feature. This is underrated. When someone emails you for the first time, Spark holds it in a separate queue. You approve or block them. One click. After that, the decision is permanent — they’re either in or out. It’s a different take on inbox management than Superhuman’s speed-first approach. Less about processing faster, more about controlling what you process at all.

Stability. Spark is made by Readdle, an independent company. No acquisition news. No bundle confusion. It’s just an email app trying to be the best email app. That matters more in 2026 than it did in 2024.

The Grammarly Acquisition — What It Actually Means

Grammarly acquired Superhuman in mid-2025 (around July). The deal terms were never disclosed — Superhuman had last been privately valued at $825 million back in 2021, but that number is a valuation, not the price Grammarly paid. Then, separately, in October 2025, Grammarly rebranded its parent company to “Superhuman.” The email app is now called “Superhuman Mail.” And there’s now a “Superhuman Suite” that bundles Superhuman Mail with Coda, Grammarly, and something called Superhuman Go.

The honest take: it’s a lot of change in a short time for a product that people paid a premium for because it was focused.

On pricing: to access the full Superhuman Mail feature set, you need a Grammarly Business plan at $33/month (annual) or $40/month monthly. That’s the same Business annual rate that existed before the rebrand — the acquisition didn’t push the price up, even though it’s easy to assume it did given the timing.

Whether the bundle is worth it depends on whether you were already paying for Grammarly and Coda. If yes, the combined pricing might actually be a better deal. If you just want email, you’re now paying for things you didn’t ask for.

What I don’t know (and nobody can tell you honestly right now) is what happens to the Superhuman Mail product over the next two years as Grammarly integrates everything. Will the email focus remain? Will Auto Drafts get better from Grammarly’s writing AI, or will the product get diluted? It could go either way.

If you’re already a Superhuman user on old pricing, there’s no immediate reason to leave. If you’re evaluating it fresh today, the uncertainty is worth weighing.

Pricing Comparison

The “Is It Worth It” Math

Here’s how I’d think about this. Superhuman’s own research says users save 4+ hours per week. Let’s say you value your time at $75/hour. Four hours is $300 in time saved. Superhuman costs $33/month. That math works.

But that’s only if you actually save four hours. And that’s only if you send enough email for the speed and auto-drafts to matter.

Here’s a rougher threshold:

30 emails/day or fewer: Spark wins. You’re not spending enough time in email for Superhuman’s speed gains to pay off.

30-50 emails/day: It’s close. Try Spark Premium at $5/month first. If you find yourself wanting faster triage and auto-drafts, consider Superhuman.

50+ emails/day, email is your job: Superhuman is probably worth it. The time savings are real at that volume. Sales teams, executives, founders who are the primary point of contact for their business.

You need Android or Windows: Superhuman doesn’t exist for you. Spark.

Who Should Pick Which

Pick Superhuman if:

• You send 50+ emails daily and email is central to your role
• You’re a Gmail or Outlook user exclusively
• You’re willing to invest in learning the keyboard shortcuts
• You can absorb $33-40/month without thinking about it
• You were already paying for Grammarly Business

Pick Spark if:

• You want a solid free email app with real AI features
• You’re on Android or Windows (or any non-Gmail/Outlook provider)
• You send under 50 emails a day
• You want cross-platform consistency across devices
• You’re managing a team inbox (Spark’s collaboration features win here)
• Budget matters

A Note on SaneBox

One thing worth mentioning: SaneBox works with both tools. It’s a filtering layer that sits on top of whatever email client you use. It handles the inbox noise — newsletters, notifications, low-priority stuff — so your main inbox only shows what actually needs your attention.

At $7/month (Snack plan), you could run Spark Free + SaneBox for $7/month total and get smart inbox filtering that rivals what you’d get from premium clients. It’s a combination worth knowing about.

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FAQ

Does Superhuman work with Gmail?

Yes, Gmail and Outlook are the only two supported providers. If you’re on iCloud, Yahoo, Exchange, or any other IMAP account, Superhuman won’t work for you. Spark supports all of them.

What happened to Superhuman after the Grammarly acquisition?

Grammarly acquired Superhuman in mid-2025, with deal terms undisclosed (Superhuman’s last known valuation was $825 million, back in 2021 — not the acquisition price). Separately, in October 2025, Grammarly rebranded the parent company to “Superhuman.” The email app is now called “Superhuman Mail” and is part of a “Superhuman Suite” that also includes Coda and Grammarly’s writing assistant. New users need a Grammarly Business plan to access full features, which runs $33/month on an annual plan — the same Business rate that predates the rebrand.

Is Spark’s free tier actually useful?

Yes. The free tier includes Smart Inbox (auto-sorts into Personal, Newsletters, Notifications), multi-account support, and basic email management features. For most personal email users, the free tier is legitimately good. The $5/month Premium plan adds AI Compose, My Writing Style voice learning, and thread summarization — which is where it gets interesting.

Can I use Superhuman and SaneBox together?

Yes. SaneBox works as a layer on top of any email client, including Superhuman. Some Superhuman users add SaneBox for the filtering/unsubscribe features that Superhuman doesn’t offer natively. Same with Spark — you can stack SaneBox on top.

Is Superhuman worth it for sales teams?

If your sales team is sending 50+ emails per day and relies on quick follow-ups, Superhuman’s Auto Drafts and speed can make a real difference. The Business-tier pricing ($33-40/month per seat) makes it expensive at team scale. Spark’s Teams plan or Shortwave Pro are worth comparing at that stage.

Related: Best AI Email Tools (2026) | SaneBox Review: Does AI Email Filtering Actually Work?

Want help building a custom email AI system? Check out our AI workshops at Asian Efficiency.

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