Note Taking & Knowledge Base · Updated 2026
Quick Verdict
Choose OneNote if you need a free, flexible digital notebook that works seamlessly with Microsoft Office. Choose Capacities if you are a knowledge worker willing to pay for a structured, object-oriented system to build a queryable, interconnected knowledge base.
OneNote is a free-form digital notebook that excels at unstructured note-taking, sketching, and clipping web content, ideal for users deeply integrated into the Microsoft ecosystem. Capacities adopts a structured, object-oriented approach, treating notes, people, books, etc., as interconnected 'objects' that can be linked and queried, functioning more like a personal database. While OneNote is free and prioritizes freeform capture, Capacities is a premium tool ($12/mo) designed for building a structured, scalable 'second brain.' Their core philosophies differ: OneNote mimics a physical notebook, while Capacities mimics a networked database of entities.
Side-by-Side Comparison
| Aspect | OneNote | Capacities |
|---|---|---|
| Pricing | Free | Premium ($12/month) |
| Ease of Use | Very easy, mimics physical notebooks | Moderate, requires understanding of object-oriented structure |
| Scalability | Good for volumes of notes; poor for complex linking | Excellent for scaling interconnected knowledge |
| Integrations | Deep Microsoft 365, web clipper | API, web clipper, limited third-party |
| Open Source | No | No |
| Best For | Freeform capture, Microsoft ecosystem users | Structured knowledge management, building a connected second brain |
Choose OneNote if...
OneNote is the better choice when your primary need is a free, intuitive digital scratchpad for meetings, lectures, or brainstorming, especially if you heavily use Microsoft 365. Its strength lies in its unstructured, page-and-section hierarchy, support for handwriting and multimedia, and seamless syncing across Windows, macOS, iOS, and Android at no cost.
Choose Capacities if...
Capacities is the better choice when you need to manage complex knowledge, research, or projects where the relationships between concepts are as important as the notes themselves. It is superior for users who want to create a queryable web of connected information (a 'second brain') without managing a full database, and who value structured data over freeform pages.
Product Details
OneNote
A digital notebook for capturing, organizing, and sharing notes across all your devices.
Pricing
Free
Best For
Students, professionals, and teams already invested in the Microsoft ecosystem who need a flexible, free-form digital notebook for capturing ideas and research.
Key Features
Pros
- + Completely free with a robust feature set
- + Excellent cross-platform availability and sync
- + Superior handwriting and stylus support, especially on Windows
Cons
- - Organization can become messy at scale due to freeform nature
- - Sync performance and reliability can be inconsistent
- - Lacks advanced database-like features and bidirectional linking found in newer knowledge base tools
Capacities
A note-taking and knowledge management app that organizes information around objects, not just pages.
Pricing
$12/mo
Best For
Knowledge workers, researchers, and students who want to build a connected, queryable second brain without the complexity of a full database.
Key Features
Pros
- + Intuitive object-centric model reduces friction in organizing
- + Powerful visual graph makes connections clear
- + Clean, fast interface with a strong focus on writing
Cons
- - Limited offline functionality and mobile app maturity
- - No native tables or advanced spreadsheet-like features
- - Smaller ecosystem and community compared to established competitors