AppFlowy

AppFlowy is the most promising Notion alternative in the open source space, and the gap is closing fast. The interface closely mirrors Notion's: databases, Kanban boards, rich text editing, and nested pages all work smoothly. What makes AppFlowy genuinely different is the Rust backend — it's noticeably faster than Notion, especially with large databases. The local-first architecture means your data is always accessible, even without an internet connection. The open source license means you can self-host, modify, and extend it freely. What impressed us is how quickly the project has matured: features that were rough edges six months ago are now polished. The trade-off is that it's still younger than Notion, so some advanced features and integrations are missing. The collaboration features are improving but not yet at Notion's level. But for personal use and small teams who want Notion without the data lock-in, AppFlowy is the most viable alternative.

Good first choice if you want a practical tool without spending the afternoon reading developer docs.