A genuinely good fit for developers specifically because it's just plain Markdown files on disk — the plugin ecosystem and sync pricing are where you'll actually make tradeoffs.

Why it fits developers specifically

Obsidian’s core pitch is local-first storage: your notes are plain Markdown files sitting on your own disk, not rows in someone else’s database. The app itself is free, with no account required to use it (obsidian.md). For a developer, that single design decision is the whole story — it means your notes are git-able, grep-able, and diffable the same way your code is, instead of living behind a proprietary export format you have to fight with if you ever want to leave.

What’s actually useful here

• Bases — a core (built-in, not community) feature that turns your notes’ frontmatter properties into database-like table, list, card, and map views, with filtering and sorting — genuinely close to a lightweight Notion-style database, but still just Markdown files underneath (Obsidian Bases docs).
• Canvas — an infinite spatial layout for research, brainstorming, and diagramming, useful for the kind of architecture sketching that doesn’t fit neatly into a linear note (obsidian.md).
• Graph view — visualizes the links between notes, which is more useful as a “did I actually connect this idea to anything” sanity check than as a daily navigation tool.
• A large plugin ecosystem — Obsidian’s own site describes “thousands of plugins and themes,” naming Calendar, Kanban, Dataview, Outliner, and Tasks as examples. We couldn’t find a precise, current plugin count from an authoritative source, so take “thousands” as Obsidian’s own characterization rather than a number we independently verified (obsidian.md).

What it actually costs, as of writing

The core app is free for personal use. Beyond that: Obsidian Sync is $4/user/month billed annually (or $5/month billed monthly) and includes end-to-end encryption, version history, and vault sharing. Obsidian Publish is $8/site/month annually (or $10/month monthly), for turning a vault into a public website. A commercial-use license — described as encouraged for organizational use rather than strictly gated — is $50/user/year. There’s also a one-time $25 Catalyst membership for early beta access and community recognition (obsidian.md/pricing). Check the pricing page directly before budgeting — sync/publish pricing is exactly the kind of thing that shifts between when this was written and when you read it.

The honest friction

Some of this is genuinely well-documented; some of it we couldn’t verify with a credible source in this pass, so we’re flagging the difference rather than blurring it. What’s confirmed: Sync is a paid add-on, and the free alternative — syncing your vault via git or a file-sync tool yourself — is viable precisely because everything is plain Markdown, but it’s manual setup, not a toggle. What we could not independently verify with a citation: specific claims about mobile app friction or how steep the plugin-configuration learning curve is for a new user. Community discussion on both exists, but treat any specific complaint you read elsewhere as one user’s experience rather than settled fact, and judge the current app for yourself — it moves fast enough that a two-year-old complaint thread may no longer describe the current mobile experience.

Where this connects to Vaultsmith

If the idea of a developer’s second brain is appealing but starting from a blank vault isn’t, we also operate Vaultsmith, a companion store selling Obsidian and Claude Code templates — including Second Brain OS, a vault template built specifically around Claude Code workflows rather than generic note-taking (product page). We couldn’t confirm a listed price on that page at the time of writing, so check it directly rather than trusting a number here. This is a disclosed house link to a product we operate, not a paid third-party placement — see the footer disclosure for the distinction.

Related reading

For how Obsidian stacks up against Notion and Logseq specifically — including the honest tradeoff between local-first files and native team collaboration — see Notion vs Obsidian vs Logseq for developers. If it’s specifically an AI layer over your notes you’re evaluating, rather than the base app, see AI note-taking tools worth paying for.