AFFiNE

AFFiNE (pronounced "a-fine") takes a different architectural bet than most Notion alternatives: instead of building a document editor that can switch views, it builds an infinite canvas where documents and whiteboards are the same surface. In "page mode" you write structured content with blocks, headings, and embedded databases. Switch to "edgeless mode" and that same content floats on an infinite canvas alongside sticky notes, hand-drawn shapes, connectors, and freeform images. No copy-paste between tools required — the same block object lives in both contexts.

The technical foundation is CRDT-based local storage using the BlockSuite library, which the team developed and open-sourced separately. CRDT means the data converges correctly across devices without a central authority resolving conflicts, making offline editing and later sync a first-class behavior rather than an edge case. The server component, AFFiNE Self-Hosted, is available as a Docker image for teams that want collaboration without cloud storage.

The project launched publicly in 2022 and has accumulated a significant GitHub following driven by genuine interest in the whiteboard-meets-wiki model. The honest limitations are maturity and the license: the codebase moves fast, some database features remain in early access, and the custom license — MIT in form but with additional commercial redistribution clauses — is stricter than what most developers expect when they see an MIT badge. For individuals and teams who want brainstorming and structured knowledge in one place without a subscription, AFFiNE is the most distinctive option in the category.