Obsidian

Local-first markdown note-taking with bidirectional linking and AI plugins

Overview

Obsidian is a privacy-first, local-first markdown note-taking application with powerful linking capabilities and an extensive plugin ecosystem. Originally built for knowledge workers, it has become a popular base for AI integrations through community plugins that connect to Claude, GPT-4, and local models. Many users employ it as a long-term memory system for AI interactions.

Key Features

• Local-first markdown files with full ownership and privacy
• Bidirectional linking and knowledge graph visualization
• Extensive plugin ecosystem (1000+ community plugins)
• AI integrations via plugins (Obsidian Copilot, Smart Connections, etc.)
• Canvas feature for visual note organization
• Offline-first with optional sync
• Customizable themes and appearance
• Backlinks and reference management

Pricing

• Personal use: Free
• Commercial use: $50/user/year
• Sync add-on: $4/month
• Publish add-on: $8/month
• Total: Free to $50+/year depending on usage tier