Logseq

Logseq is a leading local-first, non-linear knowledge base that prioritizes user privacy and data longevity. Architecturally, Logseq is built on ClojureScript and leverages a unique graph-based data model using DataScript, a Datalog database that runs in the browser and desktop environments via Electron. Unlike traditional document-based note-taking apps, Logseq treats every paragraph as a block, enabling granular bi-directional linking and atomic data retrieval. As of 2026, Logseq has transitioned to its 'Logseq DB' architecture, significantly improving performance for large graphs and enabling real-time collaboration without sacrificing its local-first ethos. The platform supports both Markdown and Emacs Org-mode formats, ensuring zero vendor lock-in. Its market position is solidified as the primary open-source alternative to Obsidian and Roam Research, favored by researchers, software engineers, and privacy advocates. The 2026 roadmap emphasizes AI-assisted synthesis through local LLM integrations and a robust whiteboarding experience (Canvas) that allows users to visualize connections between disparate nodes in their knowledge graph.