Agentys vs ChatGPT vs Superhuman vs SaneBox: The 2026 Four-Way Comparison
· Sovattha Sok
Agentys vs ChatGPT vs Superhuman vs SaneBox: an honest 4-way comparison for 2026. Validated pricing, real trade-offs, and a clear breakdown of which tool solves which email problem.
Each of these tools solves a genuinely different problem. ChatGPT writes on command. Superhuman speeds you up. SaneBox keeps the noise out. Agentys drafts your replies automatically. Here is what each one actually does well — and where each one stops.
Why compare four tools at once?
Email consumes roughly 28% of a knowledge worker's week, according to McKinsey Global Institute's *The Social Economy* (2012) — a figure that has only grown with remote-first collaboration norms. The market's response has been a wave of tools, each solving a slice of the problem. The trouble is that most comparison articles pit one against another as if they compete directly. They do not.
ChatGPT, Superhuman, SaneBox, and Agentys each address a distinct failure mode of the modern inbox. Comparing them without acknowledging that is like comparing a chef's knife, a dishwasher, a grocery delivery service, and a meal-prep app — all food-related, all useful, none interchangeable. This article lays out the honest case for each one, including the situations where each falls short. Disclosure: Agentys publishes this blog. The comparison below uses publicly available pricing as of May 2026.
ChatGPT (Plus $20/mo): raw generation, no inbox
ChatGPT has a genuine strength that is worth naming clearly: it is a highly versatile text generator available at consumer pricing. Open a blank prompt, paste a difficult client email, describe the reply you want, and ChatGPT will produce a draft that would take most people ten minutes to write — in about eight seconds. For complex, high-stakes messages where you need to think out loud before writing, that brainstorming function is real.
The workflow ceiling arrives immediately. ChatGPT has no connection to your inbox. Every email you want help with must be manually copied out of Gmail or Outlook, pasted into the chat window, prompted, and the output copied back. There is no persistence between sessions — if you close the tab, the model has no memory of your preferred tone, your client relationship context, or the thread history you shared last Tuesday. For a person receiving 50 emails a day (McKinsey Global Institute, 2012), running that copy-paste loop on each message is itself a significant time cost.
ChatGPT Plus costs $20/month. At that price it is exceptional value for general writing tasks. The honest assessment: if your email bottleneck is occasional complex drafts — board memos, escalation emails, client proposals — ChatGPT is a useful aid for those occasional drafts. If your bottleneck is the sheer volume of routine replies, it will not help. Useful for: ad-hoc complex drafts, anyone not ready to connect a third-party tool to their inbox.
Superhuman ($30–$40/mo): a fast keyboard-first client, now Grammarly-owned
Superhuman occupies a specific and defensible niche: it is a meticulously designed email client for people whose productivity bottleneck is inbox navigation speed rather than composition volume. The keyboard-first interface, split-inbox view, read-status tracking, and one-key snooze are genuinely faster than Gmail or Outlook for power users who have invested in the learning curve.
In July 2025, Grammarly announced its acquisition of Superhuman; the deal closed in October 2025 at approximately $825 million, with founder Rahul Vohra remaining as CEO (Wikipedia, "Superhuman (email client)"). The acquisition accelerated Superhuman's AI roadmap. On the Business plan ($40/month), users now get Auto Drafts — replies generated with per-contact voice matching — and a writing-style layer that learns from sent history. These are real features that narrow the gap with dedicated drafting tools.
The honest trade-offs are three. First, Superhuman replaces your current email client entirely — you cannot run it as an add-on alongside Gmail's web interface. For teams already invested in Gmail or Outlook workflows, that migration cost is non-trivial. Second, the email AI — including Auto Drafts — lives exclusively on the $40/month Business plan, which is also the tier that gives you the full email client; the cheaper $30/month Pro tier covers writing tools and rewrites only and does not include the inbox AI (and there is no longer a free tier for the client itself). Third, Superhuman operates in real time — it surfaces drafts as you read, it does not process your queue automatically in the background. The drafting work starts only when you open your inbox and begin reading. Built for: founders and executives whose primary complaint is inbox navigation speed and who are willing to switch clients entirely.
SaneBox ($7–$36/mo): filtering solved, writing untouched
SaneBox has been doing one thing consistently since 2010: keeping low-priority messages out of your primary inbox. Its smart folders — SaneLater, SaneNews, SaneBlackHole — are trained on sender history and your engagement signals, and they work across Gmail, Outlook, and virtually any IMAP account. The $7/month Snack plan covers a single email account with the core filtering. Lunch ($12/month) adds multi-account support and advanced filters. Dinner ($36/month) unlocks team features, reminders, and deeper analytics.
The filtering fidelity is SaneBox's genuine strength. Its algorithm has had fifteen years of refinement, and most users report it gets classification right within a few days of training. The SaneBlackHole folder — where senders go to never bother you again — has acquired a near-legendary reputation for handling newsletter subscriptions without requiring manual unsubscribe flows.
The boundary is just as clear. SaneBox is a routing tool, not a generation tool. It decides where an email lives; it never touches what your reply says. The McKinsey research finding — that email consumes roughly 28% of the workweek — splits into two distinct problems: the volume of noise arriving (what SaneBox fixes) and the time spent composing responses (what SaneBox leaves entirely to you). For someone spending two hours a day on inbox triage and twenty minutes on reply composition, SaneBox handles that one job well. For someone whose triage is already manageable but who writes thirty replies a day, SaneBox will not change the number that matters most. Useful for: anyone drowning in newsletter clutter or who manages multiple high-volume inboxes and needs reliable pre-sorting without changing their current client.
For a detailed 1-on-1 breakdown, see our dedicated SaneBox vs Agentys comparison.
Agentys (from $16.99/mo): automatic drafting, voice-learned
Agentys connects directly to Gmail, Outlook, or Microsoft 365 and runs a five-agent pipeline on your inbox: classification, intent detection, priority scoring, context retrieval, and draft generation. The pipeline learns your writing style from your sent-mail history — not from a style guide you fill out, but from the actual patterns in how you open paragraphs, how you close with a specific client, which words you never use. That trained model is what generates the drafts automatically.
The automatic processing is the most concrete differentiator in this comparison. Gloria Mark's research on attention and interruption (UC Irvine; *Attention Span*, 2023) found that recovering full focus after a notification takes over 23 minutes. Every email notification during the working day is a potential 23-minute derailment. Agentys processes incoming mail automatically in the background so that when you open your inbox, a reviewed draft queue is waiting — not a raw pile of unread messages each demanding your immediate attention.
By design, Agentys drafts for review rather than sending on its own. Every draft lands in a queue that you approve and adjust before anything leaves your account. That design choice is deliberate — professional email requires human judgment on tone and timing — but it means the tool does not remove you from the loop entirely. The time savings come from the shift from composing from a blank page to approving and lightly editing a ready draft. Best for: professionals who receive high volumes of replies that follow recurring patterns — account managers, consultants, sales teams, and founders who write the same categories of message repeatedly.
Do they stack? When to use more than one
These tools are not mutually exclusive. SaneBox + Agentys is a sensible pairing: SaneBox pre-filters the low-priority mass so Agentys's pipeline drafts only the messages that deserve a reply, and your drafts queue stays manageable rather than flooded. The two tools operate on different layers — SaneBox is a routing layer, Agentys is a generation layer — so they do not overlap.
Superhuman + ChatGPT is another common combination among power users. Superhuman handles navigation at speed, and when a particularly difficult message arrives — a contentious client, a legal nuance — the user opens ChatGPT in a separate tab to work through the draft manually. Neither replaces the other; they address different moments in the workflow.
The combination that rarely makes sense is Superhuman + Agentys. Both have drafting capabilities, and Agentys is designed to work inside your existing client (Gmail, Outlook) rather than as its own client. Using them together would create conflicting draft queues. If you have already committed to Superhuman as your client, the relevant comparison is Superhuman Business versus Agentys — and that comes down to whether you prefer a real-time in-client experience or an automatic one.
The clearest frame for this decision is the question each tool actually answers. ChatGPT answers: "Can you write this for me?" Superhuman answers: "Can I move through my inbox faster?" SaneBox answers: "Can you keep the noise away?" Agentys answers: "Can my replies be ready before I sit down?" None of these is a bad question. The one that costs you the most time today is the one worth solving first. If the honest answer is that you spend most of your email time composing rather than navigating or filtering, that is the specific problem Agentys was built for. The 7-day trial exists precisely so you can verify that against your own inbox before committing.