Knowtarium
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Knowtarium vs Obsidian

Obsidian is a note-taking app for a person writing in a folder on their own computer. Knowtarium is an end-to-end encrypted knowledge base in your browser that your own AI agents work in: every change shows who made it and can be undone, and your notes are plain markdown you can export and open in Obsidian.

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The short version

Which one is for you?

They solve different problems. Here's which one fits the way you work.

Choose Obsidian if

You write most of your notes yourself, want a full editor with plugins, keep your notes in a local folder, and need your notes on your phone.

Choose Knowtarium if

Your agents write a lot of your notes, and you want them to reach only the workspace or folders you choose, see who made every change, undo any of it in one click, and keep it all encrypted so nobody else can read it.

Side by side

Feature by feature.

TopicKnowtariumObsidian
Made forA private knowledge base that you and your own AI agents work inWriting and linking your own notes
EncryptionEnd-to-end: notes, titles, file names and links are encrypted on your device, and we can't read them. The AI you connect sees what it readsLocal files on your computer; Obsidian Sync is end-to-end encrypted by default, with an optional standard mode where Obsidian holds the key
AI agentsYour own agents over MCP: sets up Claude Code, Codex, Cursor, OpenCode and Claude Desktop, each limited to one workspace or some folders. claude.ai and ChatGPT laterAgents can work on the vault's files, and the official Obsidian CLI (since 1.12) lets agentic tools interact with the vault
Who changed whatEvery change is signed by whoever made it, you or a named agent, and can be undone in one clickNot built in
Reviewing agent changesOptional: turn on review for a workspace or a folder, and agents' changes there wait for you as a diffNot built in
FormatOKF, the open specification published by Google Cloud: markdown with fields for who wrote each note, where its claims came from and when it goes staleObsidian-flavoured markdown: wikilinks, embeds and callouts that other tools may not read, and no shared standard for who wrote or checked a note
Lock-inNone: export every workspace as plain OKF markdown files in one zip, readable by any editor or agentPlain markdown files, but Obsidian-specific syntax may not carry over to other tools
FreshnessNotes past stale_after are flagged for a refreshNot built in
WritingA markdown editor with properties on top that saves as you typeA full editor with community plugins, and the heart of the app
SyncBuilt in: every browser you sign in on, end-to-end encryptedSync from $4/month and Publish from $8/month (billed yearly)
PlatformsA web app in your browser; no desktop or phone app yetmacOS, Windows, Linux, iOS and Android
PriceFree with 500 MB and one workspace; Starter $5.99 a month for 2 GB, Pro $11.99 a month for 10 GB; two months free billed yearlyFree, including for work; paid Sync and Publish
AccountAn email and a password; your password never leaves your deviceNone for the app

Compared on September 26, 2026, using obsidian.md; Sync encryption checked on October 5, 2026. Obsidian is a trademark of Dynalist Inc. OKF is published by Google Cloud. Knowtarium isn't affiliated with either. Spot something out of date? Email support@knowtarium.com.

Coming from Obsidian

Bring your vault in one step.

Knowtarium imports an Obsidian vault into a workspace and leaves your writing as it is:

  1. Drop the vault folder, or a zip of it, into the import screen.
  2. Wikilinks become standard markdown links, so every tool can follow them, and your own properties stay exactly as they are.
  3. Each note gets the OKF fields it needs, and the import report lists anything it couldn't keep as written.
  4. Prefer to stay offline? does the conversion on a copy of the vault, on your own computer.