Knowtarium
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Knowtarium vs Obsidian

Obsidian is built for a human writing notes. Knowtarium is built for a human reviewing what agents wrote: every agent change waits for your approval, and the files stay plain markdown that Obsidian can still open.

Pre-orderSee how it works

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, and need your notes on your phone.

Choose Knowtarium if

Agents write a lot of your documents, and you need to see who wrote each one, check every change before anyone relies on it, and have an agent check your own edits against everything connected.

Side by side

Feature by feature.

TopicKnowtariumObsidian
Made forReviewing and trusting knowledge that agents writeWriting and linking your own notes
FormatOKF, the open specification for agent knowledge published by Google Cloud: markdown with a standard for who wrote each document, who checked it and when it expiresObsidian-flavoured markdown: wikilinks, embeds and callouts that other tools may not read, and no shared standard for who wrote or checked a document
Lock-inNone: your bundle is plain OKF, so any editor, agent or OKF tool can read it, with or without KnowtariumPlain markdown files, but Obsidian-specific syntax may not carry over to other tools
Who wrote it, who checked itRead from generated and verified, and shown as a trust tier on every documentNot built in
Trust in the graph and listsEvery document is coloured by its tier: unverified, machine-confirmed, human-reviewed, fully verified or staleNot built in
FreshnessDocuments past stale_after are flagged and queued for a refreshNot built in
Reviewing agent changesEvery change shows as a diff against the last verified version; approve or reject itNot built in
Sources and citations[^source-id] citations link to the document's sources, with who made them and how often they're usedNot built in
AI agentsAgents work on the files directly, and an optional local MCP server helps chat apps that can't reach your diskAgents can work on the vault's files, and the official Obsidian CLI (since 1.12) lets agentic tools interact with the vault
WritingEdit any document yourself; your agents write tooA full editor, and the heart of the app
Checking your own editsAn agent checks every edit you make against the documents connected to it, so nothing goes out of syncNot built in
Sync and publishingNone of its own; works with git, iCloud or DropboxSync from $4/month and Publish from $8/month (billed yearly)
PlatformsmacOS, Windows and LinuxmacOS, Windows, Linux, iOS and Android
Price$20 once, $10 during pre-orders; no subscriptionFree, including for work; paid Sync and Publish
AccountNoneNone for the app

Compared on September 26, 2026, using obsidian.md. 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 contact@magentix.studio.

Free migration skill

A free skill does the migration for you.

Knowtarium includes a free migration skill that does the conversion for you. Your agent runs it on your Obsidian vault and leaves your writing untouched:

  1. It adds the OKF fields to every document: a type, who wrote it, and when it goes stale.
  2. It turns wikilinks into standard markdown links, so every tool can follow them.
  3. It keeps your own properties exactly as they are, and writes an index of the bundle.
  4. You open the folder in Knowtarium and review the result like any other change.