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Self-Hosted Privacy AI Knowledge Base Note Taking Personal Database Local First

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Last Updated: 08-11-2026 12:44 PM (UTC)

PenX

PenX delivers an open-source structured note-taking application that functions as a personal database disguised as an elegant editor — combining the outline workflow of Workflowy and Roam Research with the structured data capabilities of Tana through MetaTags that transform every note into a queryable database record. The local-first architecture stores all data on-device using PGLite, an in-process PostgreSQL-compatible engine, ensuring data ownership regardless of cloud connectivity. End-to-end encryption protects all synchronized data so that even the sync server cannot read your notes, tasks, ideas, or documents. GitHub-based version control provides out-of-the-box backup and history with full commit-level recovery. MetaTags are the core innovation — attaching structured tags to any note converts it into a database entry with typed fields, enabling table views, filters, and queries across your knowledge base without imposing rigid folder hierarchies. The daily notes workflow encourages free-form capture while MetaTags handle organization automatically, letting you record thoughts without deciding physical location upfront. AI-driven features assist with content generation, summarization, and intelligent search across your personal data hub. Real-time sync keeps web, desktop, and mobile in perfect alignment. Cross-platform availability includes web, desktop for Windows, macOS, and Linux, iOS, and Chrome extension. Deploy the web service via Next.js with pnpm using tRPC and Prisma. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.

PenX
PenX
PenX

Benefits

  • Personal Database in Note Form
  • MetaTags transform outline notes into structured database records with typed fields, enabling table views, filters, and queries without imposing rigid folder hierarchies on your workflow.
  • Local First Data Ownership
  • PGLite stores all data in-process on your device using PostgreSQL-compatible storage, ensuring complete ownership and offline functionality regardless of internet connectivity.
  • End to End Encrypted Sync
  • All synchronized data is encrypted before leaving your device so that sync servers and third parties cannot access your notes, tasks, passwords, or documents in transit or at rest.
  • Cross Platform Availability
  • Web application, desktop apps for Windows, macOS, and Linux, iOS mobile app, and Chrome browser extension provide seamless access to your knowledge base from any device.

Features

  • MetaTags System
  • Inspired by Tana's supertags, attach structured metadata to any note converting it into a database record with typed fields enabling table views and filtered queries.
  • Daily Notes Workflow
  • Capture thoughts freely in daily entries while MetaTags handle organization automatically, eliminating the need to decide physical location before recording ideas.
  • GitHub Version Control
  • Out-of-the-box version control backs up your entire knowledge base to GitHub with commit-level history and full recovery capabilities.
  • AI Assistant
  • AI-driven features assist with content generation, summarization, and intelligent search across your personal data hub for faster knowledge retrieval.
  • Outline Editor
  • Block-based outline editing with drag-and-drop, nested hierarchies, and keyboard shortcuts providing the speed of Workflowy with database structure underneath.