Obsidian

What it is

Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files. It is often described as a 'second brain' because it allows you to link notes together, creating a web of thoughts. Unlike cloud-based tools, your data is 100% yours and lives on your hard drive. With its incredible 'Graph View,' you can visually see the connections between your ideas, making it a favorite for researchers, writers, and students who value privacy and long-term data durability. Who it is for: people who want a personal knowledge base they own outright. Notes are plain Markdown files in a folder on your disk, so they open in any editor, survive the company going away, and can be versioned with Git. The core app is free, including for commercial use, and the community plugin ecosystem adds tasks, calendars, Kanban boards, spaced repetition and much more. Where it falls short: it is a single-user tool. Real-time collaboration in the Notion sense does not exist; the paid Sync service keeps one person's vault consistent across devices, and Publish turns notes into a website. Setup is a hobby in itself: a new user faces plugin choices, themes and linking conventions before the first useful note. Teams that need shared databases, comments and permissions should look at Notion or a wiki. Individuals who value ownership and links between notes over polish tend not to leave once they settle in.

Key features

• Graph View

  A dynamic, interactive map visualizing all the links between your notes.

• Backlinks

  See every other note that mentions or links to the one you are currently reading.

• Canvas

  An infinite space to visually arrange your notes, images, and links.

• Community Plugins

  Extend functionality with tools for calendars, task management, and more.

Strengths and trade-offs

Who it is for

Knowledge Workers, Students, and Privacy Advocates.

Pick it or skip it

Frequently asked questions

Is Obsidian free for commercial use, and what do Sync and Publish cost?

The app is free with no sign-up, for personal and commercial use alike; the optional Commercial license is $50 per user per year for organisations that want to support development. Sync is $4 per month billed annually or $5 monthly, with end-to-end encryption, version history and shared vaults. Publish is $8 per site per month annually or $10 monthly. Catalyst is a $25 one-time supporter licence for beta access. Students, faculty and nonprofits get 40% off Sync and Publish.

How much does Obsidian cost?

Obsidian publishes 2 plans: Sync at $4/user/mo billed annually, Publish at $8/mo billed annually. Every figure is read from the vendor's own pricing page; the pricing section above shows the source sentence for each tier.

Does Obsidian have a free plan?

Yes. Obsidian offers a free tier with limits; paid plans unlock higher usage or team features.

Who is Obsidian best for?

Knowledge Workers, Students, and Privacy Advocates.

What are the main drawbacks of Obsidian?

The trade-offs we noted: Steep Learning Curve: Mastery of linking and plugin management takes effort.; Sync Cost: Official cloud syncing between devices requires a paid 'Sync' subscription.; Mobile Setup: Managing local files on mobile devices can be technically tricky..

When should you not use Obsidian?

Skip Obsidian if: You want official cross-device sync included — Sync is a separate $4/user/mo billed annually ($5 monthly); You need to publish notes as a website: Publish is $8/site/mo billed annually ($10 monthly); You are using it inside a company — the commercial licence is $50/user/year.