Notion
Notion Labs, Inc. · Personal knowledge management
Hosted workspace combining block-based documents, relational databases, wikis and project views, with an API and built-in AI features
ProprietaryFreemiumPaidNov 2, 2026
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Obsidian
Dynalist Inc. (Obsidian) · Personal knowledge management
Local-first Markdown note-taking app with bidirectional links, graph view and a large community plugin ecosystem; optional paid Sync and Publish
ProprietaryFreePaidLocalBroken
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