Capacities

Capacities (capacities.io) is a personal knowledge management app that rethinks the fundamental unit of organization. Traditional note-taking apps store everything as a 'note' in a hierarchy of folders. Capacities stores information as typed objects — books have ISBNs and authors, people have roles and relationships, URLs have metadata, daily notes are their own entity — and builds a knowledge graph from the relationships between these objects.

**Object-based organization**

The object model makes organization more natural. When you're reading a book and want to take notes, you create a Book object and attach notes directly to it — rather than a folder named 'Books' containing a note named after the book. The Book object connects to People objects (authors you've noted), other Book objects (similar reads), and any daily notes that reference it. Over time, this creates a richly connected map of your knowledge base.

**AI integration**

Capacities' AI assistant understands the object structure of your knowledge base. You can ask it questions about your notes ('What have I written about compound interest?'), generate summaries of specific objects ('Summarize my notes on this book'), or get suggestions for connecting related content ('What notes should I link to this new person I just added?').

The AI has access to your entire knowledge base — not just the current document — which enables more contextually relevant responses than general AI tools.

**Daily notes**

Like Roam Research and Reflect, Capacities emphasizes daily notes as a capture point. Each day has a dedicated space for capturing thoughts, links, and tasks. The difference in Capacities is that anything captured in a daily note can be instantly converted to a proper typed object — a mentioned book becomes a Book object, a mentioned person becomes a Person object.

**Pricing**

Capacities offers a generous free plan with unlimited objects, daily notes, and AI chat. The Pro plan ($9.99/month) adds collaboration, version history, and higher AI usage limits.

**Frequently Asked Questions**

How is Capacities different from Notion? Notion is a team workspace; Capacities is a personal knowledge management tool. Capacities has a more semantic, object-based model; Notion has broader team collaboration features. Is Capacities available offline? The Capacities desktop app works offline with local-first sync. How does the AI in Capacities compare to Notion AI? Capacities AI understands the object structure of your notes; Notion AI works on page-level content. For personal knowledge management, Capacities AI has a structural advantage.