6 Best Open Source Notion Alternatives

Notion is a flexible workspace app that blends notes, documents, wikis, task boards, and lightweight databases into a single connected tool. Teams use it for internal documentation, project tracking, and knowledge bases, while individuals use it for personal notes and planning, largely because pages, databases, and views can be mixed and linked together in one place.

The pull toward open-source alternatives usually starts with data ownership and long-term access. Notion content lives entirely on Notion's servers, and while exports exist, they don't always preserve database relations, formulas, or formatting perfectly, which makes years of accumulated notes feel harder to leave than they should. Pricing per seat adds up for larger teams, and offline access has historically been limited compared to tools designed to work fully on-device.

The open-source field here is broad. AppFlowy and AFFiNE both aim directly at Notion's page-and-database model with local-first or self-hosted storage. Logseq and Siyuan focus on networked, bidirectional-link note-taking rather than databases. Outline is built specifically for team wikis and documentation. Trilium is an older, hierarchical note-taking tool aimed more at personal knowledge management than team collaboration.

Because these tools serve different use cases within what Notion does as one product, the right choice depends on what you actually use Notion for. A team wiki needs different features than a personal daily-notes system. Check whether the tool supports the database and relational features your Notion workspace relies on, since that's the hardest feature set to replicate outside Notion itself. Look at sync reliability across devices, mobile app quality, and whether real-time multi-user editing is supported if your team collaborates on documents simultaneously.