Pricing: Freemium
Verified: Yes
Editor rating: 4.2/5
Updated: August 2026
Build your second brain with bidirectional linked notes + interactive knowledge graph visualization - 100% free personal use, local-first Markdown privacy.
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Editor-selected listing
Verified by our team
Independent & reader-supported
Editor's Verdict
Official ReviewObsidian's strength is ownership: your notes are plain Markdown files stored locally, so they stay portable, private, and free of cloud lock-in. On top of that it layers genuinely useful linking — backlinks and an interactive graph that let connections emerge across a large vault — plus a deep ecosystem of 2,000+ community plugins covering everything from kanban boards to flashcards, and it stays fast even at 100K+ notes. For personal use it is free; the costs are a $50/user/year commercial license and optional Sync ($5/mo) and Publish ($10/mo) services, and getting the most from the plugin ecosystem takes some setup. For researchers, writers, developers, and PKM enthusiasts who value local-first privacy and extensibility over an out-of-the-box cloud app, it is one of the strongest options available.
4.2 / 5.0
Editor RatingReviewed by Sohail Akhtar
Lead Editor & Founder
Pros
What we like
- Bidirectional linking plus an interactive graph view surface connections across notes
- Notes are plain local Markdown files — portable, future-proof, and private by default
- Local-first with offline access; no account required for personal use
- 2,000+ community plugins and themes (kanban, calendars, flashcards, and more)
- Stays fast with very large vaults (100K+ notes) across desktop and mobile
- Free for personal use
Cons
Limitations
- Commercial use requires a $50/user/year license; Sync ($5/mo) and Publish ($10/mo) are paid add-ons
- Cross-device syncing needs the paid Sync service or a manual/third-party setup
- Getting the most from the plugin ecosystem takes some setup and customization
Pricing
| Plan | Details |
|---|---|
| Free (personal) | $0 — the full app with all core features, community plugins, Canvas, and Bases. No sign-up, no usage caps. |
| Sync (add-on) | $5/month, or $4/month billed annually — end-to-end encrypted sync across your devices. |
| Publish (add-on) | $10/month, or $8/month billed annually — publish your notes as a website. |
| Commercial license | $50/user/year — optional since Feb 2025; using Obsidian for work is free, organizations buy it to support development. |
| Catalyst | One-time donation from $25 — early insider builds and community perks; unlocks no app features. |
Obsidian's core app is genuinely free for personal use — every feature (bidirectional linking, graph view, Canvas, Bases, 4,000+ community plugins) with no account required. Optional paid add-ons are Sync at $5/month ($4/month billed annually) for encrypted cross-device sync and Publish at $10/month ($8/month annually) for publishing notes to the web. A commercial license is $50/user/year (voluntary since Feb 2025 — using Obsidian at work is otherwise free), and Catalyst is a one-time donation from $25 that supports development without unlocking features.
What is Obsidian?
Obsidian revolutionizes note-taking by automatically linking related ideas across your entire knowledge base. Click any word/phrase to see connected notes, backlinks, and emerging knowledge patterns through stunning interactive graph visualization. Store everything as future-proof plain Markdown files for ultimate portability and control.
Supports 100K+ notes without slowdown across desktop/mobile with 2000+ community plugins for calendars, kanban, flashcards, mindmaps, excalidraw, and more. Perfect for researchers, writers, developers, and PKM enthusiasts who demand local-first privacy, offline access, and infinite extensibility.
Free forever for personal use ($50/user/year commercial license only). Optional Sync ($5/mo) and Publish ($10/mo) services. Scales from daily journal to enterprise knowledge management. See related.
Associated Tags
obsidian free download, knowledge graph notes 2026, bidirectional linked notes, personal knowledge management, markdown second brain free, obsidian plugins 2000+, zettelkasten software free, local first notes app
Key Features
Automatic bidirectional linking
Interactive knowledge graph view
Local Markdown files (future-proof)
2000+ community plugins/themes
100K+ notes performance
Mobile + desktop sync
Local-first privacy focused
Daily notes + graph analysis
Target Audience
Who should use Obsidian?
Researchers & writersDevelopersPKM enthusiastsPrivacy-focused note-takers
Real Use Cases
How professionals leverage Obsidian - Free Linked Notes & Knowledge Graph 2026
Discover practical workflows and real-world scenarios where Obsidian delivers key solutions.
01
Researchers and writers building a linked knowledge base (second brain)
02
Developers keeping local, version-friendly Markdown documentation
03
Students organizing notes with backlinks and graph views
04
PKM enthusiasts wanting offline, private, plugin-extensible notes
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Frequently Asked Questions
How much does Obsidian cost?
Obsidian is free for personal use with no feature limits. Optional add-ons are Sync at $5/month ($4/month annually) and Publish at $10/month ($8/month annually). A commercial license is $50/user/year (voluntary), and Catalyst is a one-time $25+ donation that unlocks no features.
What do Obsidian Sync and Publish cost?
Obsidian Sync is $5/month, or $4/month billed annually, for end-to-end encrypted cross-device sync. Obsidian Publish is $10/month, or $8/month annually, for publishing your vault as a website. Both are optional — the core app works fully without them.
Is Obsidian really free for personal use?
100% free forever for personal use. Only commercial/business use requires $50/user/year license.
Where are Obsidian files actually stored?
Local plain Markdown (.md) files in any folder. Dropbox/iCloud/Git portable across ALL apps/editors.
How many notes can Obsidian actually handle?
100K+ notes scales perfectly across desktop/mobile. Graph visualization handles massive knowledge bases.
Obsidian vs Notion/Roam - key differences?
Obsidian = local files + free + infinite plugins. Notion = cloud SaaS. Roam = expensive cloud-only.