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It's a split decision.
Pick Inbox Zero if your main problem is inbox organization, reply drafting, or a keyboard-first standalone email client. Its paid Starter plan is $20 per user monthly or $18 billed annually; the free email app excludes AI. Pick Superhuman if you want email alongside Docs, Grammarly, and cross-app AI: Pro is $15 monthly or $12 billed annually, with a free tier. These are different scopes, so the lower Superhuman entry price does not make them like-for-like.
01Side by side
| Inbox Zero | Superhuman | |
|---|---|---|
| Starting price | Starter: $20 monthly or $18 annually per user | Pro: $15 monthly or $12 annually per member |
| Free plan | Email app; no AI; web, desktop, and iPhone | AI writing and docs; 20+ languages; 1 GB per doc |
| Best for | Inbox organization, reply drafts, and focused email | Email, Docs, Grammarly, and AI across apps |
| Core strength | Background inbox automation and a keyboard-first email client | AI tools for email, writing, docs, and workflows |
| Learning curve | Learning-curve details not published | Learning-curve details not published |
| Integrations and data | Works alongside existing mailboxes; connection details not published | Docs: 800+ tools; Go: Gmail, Drive, and Jira |
| Team and seat costs | Starter $20/$18; Plus $35/$28 per user monthly/annually | Pro $15/$12; Business $40/$33 per member monthly/annually |
| Support | Support details not published | Support details not published |
Inbox Zero Choose Inbox Zero if
- You want inbox organization and reply drafts in one focused tool
- You need background automation alongside an existing mailbox
- You want a keyboard-first standalone email client
Superhuman Choose Superhuman if
- You want email, Docs, Grammarly, and AI across apps
- You need Docs connections to 800+ tools
- You want Pro at $12 per member monthly, billed annually
02Pricing compared
Inbox Zero's free Email App costs $0 but excludes AI assistant features. For AI, Starter is $20 per user/month, or $18 per user/month billed annually, for one email account; it includes a limited knowledge base and a 7-day trial. Plus is $35 monthly or $28 annually for two accounts and an unlimited knowledge base. Professional is $50 monthly or $42 annually, also with an unlimited knowledge base; account limits are not published. Enterprise pricing is custom.
Superhuman has a free tier. Pro is $15 per member/month or $12 billed annually; Business is $40 monthly or $33 annually. Enterprise pricing is custom.
These aren't like-for-like prices: Inbox Zero focuses on email, while Superhuman bundles Mail, Docs, Grammarly, and Go. The lower Superhuman entry price does not mean it is a direct substitute for Inbox Zero's paid email assistant.
03Features and depth
Inbox Zero is the narrower option for email management. It automates inbox organization, drafts replies, and uses Reply Zero to identify messages that need a response. It can run in the background alongside existing mailboxes or work as a standalone, keyboard-first email client. That makes its feature set easier to assess if your main need is getting through email.
Superhuman spans more than email. Its AI can write in your tone, help with follow-ups, and offer writing support through Grammarly. Team Docs covers projects, knowledge hubs, and workflows. Go is an assistant that works across apps and can schedule meetings in conversations. The product details say Docs connects to 800+ tools, while Go connects Gmail, Drive, and Jira.
The trade-off is scope: Inbox Zero centers on inbox tasks; Superhuman adds docs, collaboration, and cross-app tools. If you only need email organization and reply drafting, those extra Superhuman features may not justify switching.
04Ease of use and learning curve
Inbox Zero offers two ways to work: let its automation run alongside an existing mailbox, or use its standalone email app. The standalone client is keyboard-first, which may suit people who prefer shortcuts, but the published details do not specify its onboarding process or shortcut list.
Superhuman combines Mail with Docs, Grammarly, and Go, so there are more product areas to consider than with an email-focused assistant. Its app-wide assistant and tool connections may be useful if you want help across work apps, but they also make the choice less straightforward if your only goal is inbox management. The available product details don't provide a direct comparison of setup time or learning curve, so choose by the workflow you need rather than assuming one is easier.
Questions people ask
Is Inbox Zero cheaper than Superhuman?
Not on the listed paid entry prices: Inbox Zero Starter is $20 per user/month, or $18 billed annually, while Superhuman Pro is $15 per member/month, or $12 billed annually. They cover different scopes, though: Superhuman includes Docs, Grammarly, and Go, not just email.
Does Inbox Zero's free plan include AI?
No. Inbox Zero's free Email App excludes AI assistant features. Its Starter plan includes a 7-day free trial and costs $20 per user/month, or $18 per user/month when billed annually. The listed Plus and Professional plans also include AI-related paid access, at higher prices.
Can Inbox Zero replace my current email app?
It can work either alongside existing mailboxes in the background or as a standalone email client. The standalone option is described as keyboard-first. The published details do not list supported mailbox providers or account limits for every plan, so check those before switching.
Which should I choose if I mainly want a faster email workflow?
Choose Inbox Zero if inbox organization, reply drafts, Reply Zero, or a keyboard-first standalone client are your priorities. Choose Superhuman if you also want Docs, Grammarly, and Go's cross-app assistance. Superhuman has a free tier; Inbox Zero's free email app excludes AI features.