Why Unibrain¶
AI agents are becoming coworkers. They need a shared memory.¶
Most people now use more than one AI. Claude for writing and research, ChatGPT for quick questions, a coding agent in the terminal, maybe an agent on a server that runs on a schedule or answers on Telegram. Each of them is useful, and each of them forgets everything the others did.
The built-in memory in each app only helps that app. Copying notes between them by hand doesn't scale. And letting several agents write into one place raises a new question: what did they change, and can I trust it?
Unibrain is the answer to both:
- One memory for all of them. Every agent reads and writes the same vault through the open Model Context Protocol (MCP).
- Accountability for every write. Every change is a Git commit that says which app and which named agent made it. You can see it, review it and undo it.
The promise¶
Give every agent your notes and stay in control. Your Markdown vault, in your own Git repo, with a signed record of every change and a phone app to review it.
1. You own the notes¶
Your notes are ordinary Markdown files in a private GitHub repo that belongs to you. There's no proprietary format, no export step and no lock-in. The same files open in any editor that understands Markdown, and your full history is in Git from day one.
2. Agents are accountable¶
- Every change is one commit, labelled with the app that made it (
claude,chatgpt,web…). - Agents with a name sign their writes: a change by your "Igor" persona shows as
Igor (claude), separate from plain Claude. - There is no delete tool. Agents can create, add, edit, move, rename and archive, but they can't make notes disappear.
- A safety net watches every new commit and flags anything that rolls notes back to an older version or deletes notes, such as a stale copy pushed from another device.
- Moves and renames rewrite every link across the vault, so reorganizing never breaks anything.
3. Reading and reviewing is a pleasure¶
Agents do most of the writing, so you mostly read. The web app is built for that: fast search, beautiful rendering of diagrams, math and callouts, a Tasks page that pulls every todo out of your notes, and whole folders kept offline for a flight.
How it compares¶
The landscape moves quickly. This is our honest reading as of October 2026; check each product for its latest features.
| Unibrain | Basic Memory | Obsidian | Notion | Built-in AI memory | |
|---|---|---|---|---|---|
| Plain Markdown files you own | Yes | Yes | Yes | No | No |
| Lives in your own Git repo, with history | Yes, built in | Optional | With a plugin | No | No |
| Hosted connection for any AI app (MCP) | Yes | Yes | Desktop tools and plugins | Yes | One app each |
| Every change signed by app and agent | Yes, every commit | Audit logs on business plans | No | Page history | No |
| No delete tool, plus a rollback safety net | Yes | Version history | File recovery | Trash and history | n/a |
| Phone reading, offline folders | Yes | Mobile access | Yes | Yes | n/a |
| 26 diagram types and math | Yes | Not checked | Mermaid, plugins | Mermaid | n/a |
| Teams and shared workspaces | Not yet | Yes | Shared vaults | Yes | n/a |
Where Unibrain shines: people who let several agents write to their notes and want to stay in control, and anyone who wants their knowledge base to be a plain Git repo rather than someone else's database.
Where others are ahead today: team workspaces and collaboration (Notion, Basic Memory), deep desktop editing and plugins (Obsidian), and semantic search (Basic Memory). See What's new for where Unibrain is heading.
Works with Obsidian, doesn't replace it¶
Unibrain follows Obsidian's Markdown conventions: [[wiki links]], #tags, callouts, embeds, block links and task due dates. An existing Obsidian vault in GitHub works as-is, and you can keep editing it in Obsidian on your desktop while your agents and phone use Unibrain.
Who it's for¶
- AI power users who use several assistants and want them to share what they know.
- Builders running their own agents (Hermes, OpenClaw, scheduled Claude Code jobs) who need a safe, auditable place for them to write.
- Developers and technical writers who already live in Git and want their notes there too.
- Anyone who reads more than they write and wants a great phone experience for the knowledge their agents produce.