AIVM Brain vs Obsidian
A private second brain on one machine, vs the shared, governed, agent-queryable brain for a whole company.
Obsidian is a beloved local-first markdown app: your private second brain on your own machine, with backlinks, plugins, and full data ownership. AIVM Brain is the shared company brain Obsidian was never built to be: permission-aware retrieval for many people and AI agents, a content-blind tamper-evident audit, and an MCP endpoint your agents query. It does not replace your solo Obsidian vault; it governs what a team and its agents can see, with proof.
At a glance
| AIVM Brain | Obsidian | |
|---|---|---|
| Who it is for | Many people and AI agents sharing one governed brain | One person's private knowledge on their own machine |
| Shape and storage | Hosted company brain with per-tenant Postgres isolation | Local-first markdown files you own on disk |
| Permissions | Permission-aware (RBAC/ABAC) plus field-level redaction: hide one column instead of the whole file | No access control; sharing is manual files or a third-party sync/publish service |
| Agents (MCP) | Agents query via MCP, governed like people, with limits, human-in-the-loop, and a kill switch | No native agent endpoint; AI runs through community plugins on your local vault |
| Audit and proof | Content-blind, tamper-evident log, independently verifiable, plus an optional on-chain anchor | None; it is local notes |
| Sources | Slack, GitHub, Drive, Notion, Box, Confluence, Salesforce, Telegram, with permissions intact | Markdown files, plus a community plugin ecosystem |
| Model and data | Bring your own model key; nothing you connect trains a model | Your files stay local; AI depends on whichever plugin and model you add |
| Getting started | One command: npx @aivm/brain init, free to start | Download the app, free for personal use |
Why teams compare them
Obsidian is the incumbent everyone compares to, and for good reason. The comparison comes up when knowledge has to be shared across a team and queried by AI agents, with proof of who saw what, which a single-machine markdown vault was never designed to do. The question is not which app is the nicer place to write notes, it is whether a company and its agents can share one source of truth and prove every access.
Obsidian reports more than 1.5 million users (Feb 2026), a beloved personal, local-first markdown app.
Source: Obsidian history and stats, via TaskadePersonal vault versus company brain
Obsidian is exceptional at what it is for: a private, local-first place to think, with files you fully own and a plugin for almost anything. That is a personal second brain on one machine. Brain is a different thing entirely: the shared brain a whole company and its AI agents read from, where each person and agent only ever sees what they are cleared to see. We are not trying to replace your Obsidian vault, and we do not claim to be a better solo notes app. Brain is the team and agent layer Obsidian was never built to be.
What a shared, governed brain adds
The moment knowledge has to be shared and queried by agents, three things a markdown vault does not have start to matter. Permission-aware retrieval, so a salary file never lands in the wrong person's answer and you can hide just the sensitive column. An MCP endpoint, so your agents can query company knowledge under the same governance as people, with limits, human-in-the-loop, and a kill switch. And a content-blind, tamper-evident audit you can verify independently of us, optionally anchored on-chain. Brain is built around exactly those.
Where Obsidian is the better fit
If you want a private, local-first, fully owned place for your own notes and thinking, with total control over plain-markdown files and a vast plugin ecosystem, Obsidian is excellent and Brain is not trying to take its place. Brain is the better fit when many people and AI agents need one shared source of truth, with permissions and provable access, rather than a separate vault on every person's machine.
Who each is best for
Questions, answered
Is AIVM Brain a replacement for Obsidian?
No. Obsidian is a private, local-first markdown brain for one person, and Brain does not replace it. Brain is the shared, governed company brain that many people and AI agents query, with permissions and a verifiable audit, which a single-machine vault was never built to be.
Can my AI agents query knowledge the way they can't in Obsidian?
Yes. Brain exposes an MCP endpoint so agents query company knowledge under the same governance as people, with limits, human-in-the-loop, and a kill switch. Obsidian has no native agent endpoint; AI there runs through community plugins on your local vault.
What does Brain give a team that Obsidian can't?
Permission-aware retrieval, field-level redaction, a content-blind tamper-evident audit you can verify yourself, and connectors to Slack, GitHub, Drive, Notion and more with permissions intact. Obsidian is wonderful for solo notes; Brain is the governed shared layer for a company and its agents.