Trilium Notes Application

Trilium Notes is a hierarchical open-source personal note-taking application with focus on building large personal knowledge bases. Created by zadam in 2017 and written in JavaScript (Node.js backend, web frontend), Trilium has over 27,000 stars as of 2026 and provides a unique approach to personal knowledge management. Key features: hierarchical note tree (notes are organized in a flexible tree structure where any note can contain sub-notes at any depth, enabling both hierarchical and graph-based knowledge organization). Note types (text notes with rich text editing, code notes with syntax highlighting for over 100 languages, relation map notes for visual knowledge graphs, mermaid diagrams, book notes for long-form content, and CSS and JavaScript notes for customization). Bidirectional linking (wiki-style internal links between notes with automatic backlinks panel showing all notes that reference the current note). Scripting (JavaScript scripting engine for automation, custom note processing, and application extension via script notes). Self-hosted (run as a self-hosted server with web frontend accessible from any browser, plus desktop clients for Windows, macOS, and Linux that sync with the server). Sync engine (full bidirectional sync between server and clients with conflict resolution, enabling offline work and multi-device access). Cloning (clone notes into multiple locations in the tree without duplication, enabling the same note to appear in multiple contexts). Encryption (end-to-end encryption of individual notes or entire subtrees with password-protected encryption keys). Built-in backups (automatic SQLite database backups with configurable retention). Import and export (import from Evernote, Markdown, OPML, and HTML, export to Markdown and HTML). Attributes (define custom attributes and relations on notes for metadata tagging and structured data). Synchronization with mobile devices via responsive web interface or third-party mobile apps.