Logseq

Logseq is an open-source, privacy-first knowledge management and note-taking application that stores everything in plain text Markdown/Org-mode files on your local device. Its outliner-based structure, bidirectional linking, and knowledge graph view create a connected note-taking system. AI features include semantic search, note summarization, and content generation. Knowledge workers, researchers, and personal knowledge management enthusiasts use Logseq for its combination of local-first data ownership, powerful bidirectional linking, and flexible organizational structure. The block-based approach enables more granular linking than page-based notes. Logseq's local-first, open-source model has built a devoted community of users who value data ownership and privacy. Its active plugin ecosystem and compatibility with the broader PKM tool landscape (it can read Obsidian-formatted files) make it a long-term, commitment-worthy knowledge system.