Logseq is a privacy-first, open-source knowledge base. Its official repository describes it as a platform for 📝knowledge management and collaboration that "focuses on privacy, longevity, and user control." Logseq supports multiple file formats, including 📝Markdown and Org-mode, and offers tools for PDF annotation and task management. Its source code is published on GitHub under the AGPL-3.0 license.
Logseq runs as a desktop application, downloadable from the repository's releases page, and a web version is available at app.logseq.com. According to the repository, its mobile apps provide "access to most of the features of the desktop application." The project is building a Database version, or DB version, which introduces DB graphs and a new sync approach called RTC, for Real Time Collaboration. As of November 2026, the repository states that "The DB version is in beta status while the new mobile app and RTC is in alpha," and warns that data loss is possible, recommending automated backups or regular SQLite DB backups. The DB version has its own new mobile app on iOS, with Android listed as coming soon. Logseq also provides a plugin API that lets developers create custom plugins and extend its functionality.