These are three different bets on where your notes should live — a proprietary cloud database, plain Markdown files, and plain Markdown/Org files with an outliner-first model — and the right pick depends on whether you want your notes to be git-able more than you want built-in team collaboration.

The question that decides everything else: where does the data live?

Notion stores your content in its own proprietary block/database model, server-side, behind an account — there’s no “just open the file in a text editor” option. Obsidian stores everything as plain Markdown files on your own disk, with no account required to use the core app (obsidian.md) — full detail in our Obsidian review. Logseq makes the same local-first bet as Obsidian but from an outliner-first starting point: it’s described as “a privacy-first, open-source platform for knowledge management and collaboration,” storing data as plain-text files in “multiple file formats, including Markdown and Org-mode,” and it ships under the AGPL-3.0 open-source license (logseq/logseq on GitHub).

For a developer, that first decision cascades into everything else: git-ability, grep-ability, diffability, and whether you can ever leave without an export step that loses structure.

Pricing, as of writing

Notion (notion.com/pricing):

• Free — $0/member/month. Limited-trial access to Notion AI features (chat, document generation, database autofill).
• Plus — $10/member/month. Unlimited charts, collaborative blocks, file uploads.
• Business — $20/member/month, marked “Recommended” on the pricing page. Adds the Notion Agent for autonomous task completion, AI Meeting Notes, and Enterprise Search.
• Enterprise — custom. Adds zero data retention with LLM providers and advanced security controls.
• AI Custom Agents are a separate metered add-on beyond the plan price: “$10 per 1,000 monthly Notion credits” after a free trial.

Obsidian — the core app is free; Sync is $4/user/month billed annually ($5/month monthly), Publish is $8/site/month annually ($10/month monthly), commercial-use licensing is $50/user/year. Full breakdown and the honest caveats around it in our Obsidian review, sourced from obsidian.md/pricing.

Logseq — the core app is free and open-source, with no account required. At the time of writing, Logseq’s newer sync approach (“RTC,” Real-Time Collaboration, for syncing a graph across devices or collaborating with others) was still in alpha, and we could not find a clear consumer-facing price for it on the project’s GitHub page — the project also accepts community support through Open Collective donations rather than running a conventional paid tier structure (logseq/logseq on GitHub). If sync pricing matters to your decision, check logseq.com directly before assuming anything from this page.

What actually matters if you’re a developer specifically

• Git-ability. Obsidian and Logseq both store plain text files you can git init, diff, and grep the same way you already work with code. Notion’s export is a one-way trip out of its data model, not a native storage format.
• Structure philosophy. Obsidian is page-first, with linking and an optional outliner feel layered on top. Logseq is outliner-first from the ground up — every note is a tree of blocks by default, which fits a “daily journal + block references” workflow more naturally than a page-per-topic one. Notion is a blocks-and-databases model with the most visual polish of the three, and by far the strongest built-in multiplayer collaboration.
• First-party AI. Notion’s Business tier is the only one of the three with a vendor-shipped autonomous agent (Notion Agent) and enterprise search built in. Obsidian and Logseq both rely on community plugins for AI features — which means capability, quality, and what happens to your data all depend entirely on which plugin you install and which API key you hand it. Neither Obsidian’s nor Logseq’s core team ships first-party AI as of writing.
• Collaboration. Notion is built for shared team wikis natively. Obsidian’s sync/collaboration story is comparatively single-user-first with team features added on top (see our Obsidian review for specifics). Logseq’s collaboration story is the least mature of the three right now — it’s the feature literally still in alpha.

Honest caveats

• Notion’s per-credit AI add-on pricing (“$10 per 1,000 monthly credits”) is meaningfully harder to budget than a flat subscription — know your expected usage before assuming a number.
• We priced all three directly from the vendor’s own site at the time of writing. Pricing and feature availability in this category shifts fast enough that we’d recheck this page before trusting it blind, and you should too.
• Logseq’s project page didn’t give us a confident answer on where RTC sync pricing will land once it leaves alpha — that’s a genuine unknown, not an oversight on our part.

Where this connects to Vaultsmith

If the local-first, git-able model is the deciding factor for you, we also operate Vaultsmith, a companion store selling Obsidian and Claude Code templates — including Second Brain OS, built specifically around developer workflows (product page). This is a disclosed house link to a product we operate, not a paid third-party placement — see the footer disclosure for the distinction. For the deeper Obsidian-specific breakdown, read the full Obsidian review, or see how all of this fits into a broader toolchain in the AI dev workflow guide.