Superhuman vs Spark: What You Get for the Price Difference

The Short Answer

Superhuman Mail and Spark are aimed at the same job, making a heavy inbox workable, and they charge very differently to do it. That makes this mostly a question of value rather than features. Superhuman Mail starts at $25 per member per month billed annually and rises to $33 for Business. Spark, from Readdle, charges $8.25 per user per month billed annually on Plus and $16.58 on Pro. Round numbers: a Superhuman Mail seat costs two to three times what a paid Spark seat does.

So the only question worth answering is what that extra money buys, and who it’s genuinely worth it for.

There’s a third answer, and plenty of people shopping either tool are really after that one. They don’t want a faster inbox. They want the admin to stop being theirs. That’s Catch, an AI Executive Assistant that takes the administrative role itself: email, calendar, scheduling, coordination, reminders, reservations, real outbound phone calls, and end-to-end business travel booking, reachable from Slack, email, text message, iMessage and phone for a flat $99 a month.

What Each One Is

Catch

Catch is an AI Executive Assistant, not another window to keep open. No dashboard to learn, no workflow builder to configure. You connect Gmail or Outlook in under three minutes, then talk to Catch the way you’d talk to an assistant: in Slack, by email, by text message, by iMessage, or by picking up the phone.

From there it works proactively. It watches the calendar and resolves conflicts by actually contacting the other party. It triages incoming mail and texts you only what genuinely needs you, so a client asking for a major discount reaches you and a newsletter doesn’t. Routine replies it handles on your behalf, coming back when a reply needs a real decision. Early on it checks with you before acting; as it learns how you work, it handles more on its own. It generates scheduling links in seconds with your constraints attached, books times against links other people send you, and updates HubSpot or Zoho records, closes Asana tasks and pulls Notion briefs before your meetings.

It also does the things software normally leaves on your plate. It places real outbound phone calls from its own number to book a restaurant or arrange a late checkout. It books business travel end to end, flights and hotels, then keeps managing the trip after the booking is made. On those calls it identifies itself as an AI agent acting for you.

Pricing is one flat $99 a month with a 10-day free trial. No credits, no usage tiers, no per-call fees, no enterprise upsell. Security is SOC 2 Type II, CASA Tier 2, with data hosted in the US, and customer data is never used to train third-party models.

Superhuman

Superhuman isn’t a single email client any more, and that matters for the price conversation. It’s a four-product suite: Mail, Grammarly, Docs and Go. Superhuman Docs is a collaborative AI workspace for teams to build documents, workflows and tools from one connected surface, and Superhuman Go is a proactive AI companion that gives suggestions and manages tasks across multiple apps.

Which means two price ladders, not one. Superhuman Mail is sold on its own at $25 for Starter and $33 for Business, both billed annually, with no free tier. Go, Docs and the combined Suite share a separate ladder that starts free, then Pro at $12 per member per month billed annually, then Business at $33, then Enterprise. Superhuman Mail isn’t included in Free or Pro, so $25 is the cheapest route into the Superhuman inbox. But $12 is the cheapest route to Superhuman’s AI working on the mail you already have.

Mail is the inbox product inside that suite, and the plan decides which AI you get: Superhuman AI, calendar and scheduling, and team collaboration from Starter, with Auto Drafts and Ask AI on Business.

On the AI side, Auto Drafts automatically generates personalized responses to inbound messages and follow-ups for threads awaiting a reply, and the drafts match your style, tone and length for each contact, built from the emails you have sent before. Calendar work stays inside the inbox: connected Google and Outlook calendars side by side, shareable booking links that adapt to the recipient’s time zone and update to prevent double booking, a Find Time overlay that shows a teammate’s availability inline with yours, in-thread event creation with Zoom, Google Meet or Microsoft Teams links, and AI-drafted replies that suggest times and attach a booking link when an email asks for a meeting.

Spark

Spark is a unified email client and smart inbox manager. It pulls multiple accounts into one view and sorts what arrives into personal mail, newsletters and notifications automatically. Gatekeeper lets you pre-screen new senders and block unwanted contacts outright. Snooze and Send Later handle timing.

Spark’s AI assistant drafts emails matching a preferred voice and tone from context you give it, summarizes long threads into action items and key terms, rephrases and proofreads, translates in place, searches across emails, attachments, calendars and meeting notes, and generates AI meeting notes from calendar events.

Team collaboration is a large part of what the paid tiers buy. Shared inboxes, on the Pro tier, let several people work a common address like info@ or sales@, assigning emails, setting deadlines and tracking progress without passing passwords around. Teammates can co-author an outbound email in real time and keep a private chat thread attached to the message, and Pro adds read statuses and a HubSpot integration.

Spark also covers a lot of ground. It runs on macOS, iOS, iPadOS, watchOS, visionOS, Android and Windows, and connects to Gmail, Outlook, Yahoo, iCloud, AOL, Hotmail, GMX and standard IMAP accounts.

At a Glance

	Catch	Superhuman	Spark
What it is	AI Executive Assistant that takes admin work off your plate end to end	Four-product AI suite: Mail, Grammarly, Docs and Go	Unified email client and smart inbox from Readdle
Paid entry price	Flat $99/month, everything included	Mail $25/member/mo Starter, billed annually; $12 Pro on the Go, Docs and Suite ladder	$8.25/user/mo Plus billed annually, or $10 per user/month
Higher published tier	Still $99/month	$33/member/mo Mail Business, billed annually	$16.58/user/mo Pro billed annually, or $20 per user/month
Billing model	Flat per person, no credits or usage tiers	Per member	Per user
Enterprise tier	None. One price for everyone	Exists, pricing by contacting sales	Exists with security controls and a success manager, pricing not public
AI reply drafting	Drafts and sends on your behalf, checking in only when a reply needs your decision	Auto Drafts inside Mail, gated to Business; the $12 Pro tier’s Email Assistant drafts replies on your existing Gmail or Outlook	AI assistant drafts your emails, included from Plus
Drafting accuracy	Works from what you actually meant, not just how you word things: it comes to you with the context, takes your decision, then writes and sends	Matches your style, tone and length per contact, built from emails you have sent before	Generates emails matching a preferred voice and tone from context you supply
Scheduling	Books the meeting itself, contacts the other party and resolves conflicts before you see them	Booking links, Find Time availability overlay, in-thread event creation, AI scheduling drafts	Built-in calendar with event creation and conferencing links, Zoom and Google Meet among them
CRM	Retrieves and updates records in HubSpot and Zoho	HubSpot and Salesforce, gated to the Business tier	HubSpot, gated to the Pro tier
Mail accounts	Gmail and Outlook, the two your company actually runs on, connected by OAuth in under three minutes	Gmail and Outlook, the providers Superhuman’s own material names	Gmail, Outlook, Yahoo, iCloud, AOL, Hotmail, GMX and IMAP
Where you use it	Slack, email, text message, iMessage and phone, with one continuous thread across all of them	Superhuman Go works across multiple apps alongside Mail	Apps on macOS, iOS, iPadOS, watchOS, visionOS, Android and Windows

The Price Difference in Plain Numbers

Line the annual-billed rates up next to each other and the gap is easy to size.

Plan	Price per person per month	Works out to per person per year
Spark Plus (billed annually)	$8.25	about $99
Spark Pro (billed annually)	$16.58	about $199
Superhuman Mail Starter (billed annually)	$25	$300
Superhuman Mail Business (billed annually)	$33	$396

At the entry level, Superhuman Mail costs about $200 more per person per year than a paid Spark seat. At the top of each published tier, about $197 more. The gap is roughly $200 per person on either rung.

For a single founder that is a small amount. For a ten-person leadership team it is about $2,000 a year, and someone will have to justify it.

What the Extra Money Actually Buys

A better inbox to work in

What the Superhuman Mail premium buys is the inbox itself: Superhuman AI, email productivity, team collaboration, and the calendar and scheduling work, bundled at $25 per member per month billed annually. For someone whose day is genuinely spent in an inbox, that is the case for the price.

Catch works the same problem from a different direction. Rather than giving you a better place to process a hundred emails, it takes the triage and the routine replies over, so most of that mail never needs your attention in the first place.

AI drafting sits on very different rungs

Here’s where the price question gets sharp, because the two companies put their AI in different places on the ladder.

Spark includes its AI assistant on Plus, the cheapest paid tier, at $8.25 per user per month billed annually. Inside Superhuman Mail, Auto Drafts and Ask AI sit a rung above the entry plan, along with Superhuman Mail MCP and custom AI auto-labels: gated to Business at $33 per member per month billed annually. Starter at $25 does include Superhuman AI, email productivity, team collaboration, calendar and scheduling, unified admin and billing, and group productivity coaching. The automatic drafting people usually came for, though, is on Business.

That isn’t the whole ladder, and the cheapest Superhuman drafting isn’t $33. On the Go, Docs and Suite ladder, Pro at $12 per member per month billed annually includes an Email Assistant that drafts replies, clears inbox clutter and follows up for you, and it connects to Gmail, Outlook, Calendar and Slack, so it runs on the mail you already have rather than requiring Superhuman Mail. If drafting is the reason you’re shopping, the comparison is Spark’s $8.25 against Superhuman’s $12, and $33 only if you want the drafting inside Superhuman’s own inbox.

What each one produces is a draft. Superhuman’s Auto Drafts prepares the reply for you to review and send rather than sending it itself. Spark’s AI writes the email in your voice from the context you give it.

Catch starts from the opposite premise. It handles routine replies on your behalf, and when a reply genuinely needs a decision it comes to you with the context, takes your answer, then sends. What changes is that the email leaves your desk, rather than arriving on it better written.

Scheduling inside the inbox

Superhuman Mail’s calendar work is the clearest thing the extra money buys. Booking links that adapt to the recipient’s time zone and refuse to double book, a Find Time overlay for teammate availability, in-thread event creation that pulls in recipients and attaches a conferencing link, AI drafts that propose times when someone asks for a meeting. Spark keeps a calendar inside the client too, with event creation and conferencing links, Zoom and Google Meet among them.

If your bottleneck is scheduling, part of the $200 is defensible. Worth noticing what each is handing you, though: a better way to do the scheduling yourself. Catch does the coordination instead. It resolves conflicts by contacting the other party directly, generates constrained links in seconds, books times against links other people send you based on your availability and the urgency of the request, and modifies invites, participants and durations without you opening the calendar.

Team features are Spark’s documented strength

Shared inboxes, co-authoring, private team comments, email delegation and read statuses on Pro make Spark a genuine collaboration layer for a team working a common address, at $16.58 per user per month billed annually. On Superhuman Mail, team collaboration is included from Starter, and the HubSpot and Salesforce CRM integrations arrive at $33.

Those features serve a team sharing the work of one inbox. Catch addresses a different situation: the executive hands the admin work over entirely, so there is nothing left to divide up. Most executives shopping this category are in the second position.

Spark includes meeting notes

Spark generates AI meeting notes from calendar events, 40 a month on Plus and unlimited on Pro. A nice inclusion at that price. Catch comes at the same moment from the other side: it reminds you of pre-meeting to-dos, pulls briefs from Notion, Asana and your CRM, and asks the clarifying question you’d have forgotten, so you walk in ready instead of reading a summary afterwards.

Who the Extra Money Is Worth It For

Superhuman’s premium is worth it for a specific person. A high-volume communicator whose day is genuinely lost to email, who schedules constantly from inside their inbox, and who will use the AI drafting that Business unlocks. For that person, Starter at $25 or Business at $33 isn’t expensive. It’s a tool cost against a real bottleneck.

Spark’s price is worth it for a team that shares correspondence and wants AI drafting at the cheapest paid rung, or for someone whose mail lives across Yahoo, iCloud, AOL or an IMAP account. Spark lists all of those as supported accounts.

For a lot of executives the money goes to the wrong layer. Both products give you a better inbox to work in, and what their AI hands you is a prepared draft. If you’re paying $396 a year per seat so a busy person can work through their own mail in a better client, the comparison you actually want isn’t Superhuman against Spark. It’s any of this against $99 a month for an assistant that handles the admin end to end, phone calls and business travel included, with no per-call fees.

For scale: a fully loaded US executive assistant runs $120,000 to $180,000 a year. That’s not an argument for letting anyone go. The traditional admin role is simply handled now, and the person doing it today can grow into the operational and in-person work Catch doesn’t cover. It does put the $200 argument between two inbox tools in proportion. A small conversation happening next to a much larger one.

Pricing Comparison

Catch

One flat $99 a month. Email, calendar, scheduling, coordination, CRM and project tool actions, reservations, outbound phone calls placed on your behalf, and end-to-end business travel booking are all included. No credit system, no usage tier, no per-call fee, no higher plan waiting to be sold to you. A 10-day free trial comes first.

Superhuman

Superhuman Mail is $25 per member per month on Starter and $33 per member per month on Business, both billed annually. Enterprise exists and requires contacting sales. There’s no free Mail tier. Starter covers email productivity, Superhuman AI, team collaboration, calendar and scheduling, unified admin and billing, and group productivity coaching. Business is where Auto Drafts, Ask AI, Superhuman Mail MCP, custom AI auto-labels and the HubSpot and Salesforce CRM integrations live.

Mail sits alongside Grammarly, Superhuman Docs and Superhuman Go in the wider suite, and those share a separate ladder: Free at $0, Pro at $12 per member per month billed annually, Business at $33, then custom Enterprise pricing. Superhuman Mail isn’t part of Free or Pro, but Pro’s Email Assistant drafts replies and follows up on your existing Gmail or Outlook, which makes $12 the cheapest paid entry into Superhuman’s AI. Annual billing is 17% off the monthly rate. Which ladder you need comes down to whether you want Auto Drafts inside Superhuman Mail, or whether the Pro tier’s Email Assistant working on your existing inbox is enough.

Spark

Spark Plus is $10 per user per month, or $8.25 billed annually, and includes the AI assistant, 40 AI meeting notes a month and productivity integrations with tools like Trello, Todoist, Asana, Evernote and OneNote. Pro is $20 per user per month, or $16.58 billed annually, adding unlimited AI meeting notes, read statuses, shared inboxes and CRM integration with HubSpot. An Enterprise plan exists with security controls and a success manager, but its pricing isn’t public.

Who Should Choose Which

Choose Catch if you want:

• The admin work gone rather than organized, with replies sent on your behalf and conflicts resolved before you notice them
• One flat $99 a month, with phone calls included and no per-call fees
• An assistant you reach in Slack, email, text message, iMessage or by phone, holding one continuous thread across all of them
• Real-world actions software normally leaves to you: restaurant and hotel bookings by actual phone call, late checkouts arranged, business travel booked end to end and managed until you are home
• Proactive work on your calendar and inbox, without building a single workflow
• SOC 2 Type II, CASA Tier 2, US data hosting, and customer data never used to train third-party models

Choose Superhuman if: your day really is spent in the inbox, you schedule constantly from inside it, and you want Auto Drafts and Ask AI on the Business tier. That is the profile the premium is built for.

Choose Spark if: you have a team working a shared address together, or mail spread across providers like Yahoo, iCloud or IMAP, all of which Spark lists as supported accounts.

The Bottom Line

Superhuman Mail or Spark comes down to about $200 per person per year. Superhuman spends it on its AI drafting and the calendar and scheduling work built into the inbox; Spark spends it on team collaboration and the range of accounts and devices it covers. Both are good at what they do.

What you are left with in either case is a tidier inbox and a better-written draft. Catch takes the work itself for a flat $99 a month: it answers the routine mail on your behalf, books and rebooks with the other party directly, places the phone calls and handles business travel end to end. For most executives weighing these two, that is the stronger choice.

Frequently Asked Questions