AFFiNE vs Capacities: Which Is Better in 2026?

AFFiNE is an open-source, local-first workspace that merges documents, databases and an infinite whiteboard canvas into a single tool. In plain terms, it is like having Notion-style docs and a Miro-style whiteboard fused together, where the same content can live as a structured document and on an "edgeless" canvas. This lets you write clean, structured pages and also think visually in space — sketching ideas on a canvas, then organizing them into a document — without copying between separate apps.

Its appeal is the fusion of two modes that are usually separate, plus open-source, local-first ownership. Most tools force you to choose between structured writing and free-form visual thinking; AFFiNE lets you move fluidly between them with connected content, which is genuinely novel for planning, brainstorming and connecting ideas. Because it is local-first, your data lives on your device and works offline, and because it is open source, you can trust it, self-host it and avoid lock-in. For people who think both in words and in space, that combination is refreshingly different.

AFFiNE is a great fit for visual thinkers and planners who want structured docs and a whiteboard in one place, and for those who value open source, local-first design and data ownership. It is younger and less polished than established tools, so it suits the curious more than those needing maximum refinement and seamless collaboration today. It sits alongside Notion and Anytype in the workspace space, distinguished by its docs-and-canvas idea. If that vision resonates, AFFiNE is well worth discovering and watching as it matures.

Capacities is a modern note-taking and personal knowledge-management tool built around an object-based model. Instead of organizing everything into folders and flat documents, Capacities treats your notes as connected objects — people, books, ideas, projects, meetings — each with its own structure, that link together into a rich, navigable network. This object-centric approach makes it natural to build a structured "second brain" where information is organized by what it is and connected by how it relates, rather than buried in a folder hierarchy.

Its strengths are structure, connection and a thoughtful, pleasant design. By giving different kinds of content their own object types, Capacities helps you capture and find information in a way that mirrors how you actually think, and the linking between objects surfaces relationships and context as your knowledge base grows. It strikes a balance between flexibility and structure that appeals to people who want more organization than a simple notes app but find heavier tools overwhelming. The clean, focused experience makes building and revisiting your knowledge genuinely enjoyable.

Capacities is a great fit for students, researchers, writers and knowledge workers who want an organized, connected, object-based system for their notes and ideas — a structured second brain that is still approachable. It sits alongside tools like Notion, Obsidian, Tana and Reflect in the personal knowledge-management space, distinguished by its object-based model. If you have struggled to keep your notes organized and connected and want a tool that brings natural structure to your thinking, Capacities is a refreshing, well-designed option worth trying.