Obsidian
Free tierThe free and flexible private note-taking app that sharpens your thinking
Free tier available·All audiences·API available
Key strengths
Local-first private storage with no cloud requirementThousands of community plugins and themesOpen file formats (plain text Markdown) preventing lock-inEnd-to-end encrypted sync across devicesBi-directional linking and graph visualizationOffline access
Free tier + paid plans · from $4 USD/mo
Founded 2020
Self-hostable
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Recent changes
- Plans updated: Core app is free with no sign-up required. Optional add-ons: Sync at $4/user/month (billed annually) or $5/month; Publish at $8/site/month (billed annually) or $10/month; Catalyst one-time $25; Commercial license $50/user/year.
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Obsidian is well-suited for technical users in the following scenarios:
- Personal knowledge base / second brain: Store research, documentation snippets, and architectural notes as interlinked Markdown files with full offline access and no cloud dependency.
- Developer journaling & decision logs: Plain-text format integrates naturally with version control systems (e.g., Git), enabling diff-friendly history of architecture decision records (ADRs) or engineering journals.
- Plugin development: The open plugin API (JavaScript/TypeScript) allows developers to build custom tooling — from code snippet managers to project trackers — distributed through the community plugin ecosystem.
- Self-hosted knowledge publishing: The Publish add-on ($8/site/month billed annually) can serve a curated subset of a vault as a navigable static site with bi-directional link support.
- Encrypted cross-device sync: Teams or individuals needing E2E-encrypted note sync without trusting a third-party cloud can use the Sync add-on as a privacy-preserving alternative to generic cloud storage.
Alternatives
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