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AI Tool Comparison
Capacities vs Superhuman
A side-by-side breakdown to help you pick the right tool for your workflow.
Capacities
Organize notes as typed objects — people, books, projects — that link automatically, building a connected knowledge base without manual folders or tags.
Productivity
freemium
Superhuman
Fly through your inbox with an AI-accelerated email client — Grammarly acquired Superhuman in October 2025 and expanded it into a broader Suite with AI docs and agent tools.
Productivity
paid
Bottom Line
Superhuman edges ahead on rating (4.7 vs 4.5), but the right pick still comes down to which workflow you're running.
Choose Capacities if…
Knowledge Management
Choose Superhuman if…
Productivity
| Attribute | Capacities | Superhuman |
|---|---|---|
| Category | Productivity | Productivity |
| Pricing | freemium | paid |
| Pricing Detail | Free (5GB) / ~$10-12/mo Pro (annual) | $30/mo Starter / $40/mo Business |
| Rating |
Key Features
Capacities
- Object-based structure
- Auto bi-directional links
- AI knowledge queries
- Daily notes
- Web clipper
- Cross-device sync
Superhuman
- AI reply drafts
- Email summarization
- Keyboard-first design
- Split inbox
- Auto follow-up reminders
Pros
Capacities
- •Object model creates natural connections that folder-based tools miss
- •AI surfacing of related notes reduces 'I know I captured this' friction significantly
- •Daily note format with backlinks integrates well with structured note-taking workflows
Superhuman
- •Genuinely fastest way to do email
- •AI drafts are excellent
- •Keyboard shortcuts for everything
- •Loved by power users
Cons
Capacities
- Object model requires upfront thinking about structure vs. just dumping notes
- Smaller ecosystem than Obsidian or Notion
Superhuman
- Expensive
- Requires invitation (exclusive)
- Gmail/Outlook only
- Overkill for casual email users