version 0.1.5, unsigned build
Like antivirus for your AI's memory
Know when your AI's memory changes behind your back.
Your AI keeps notes about you and your work. Arcaeon watches that folder quietly in the background. If something changes that you did not OK, it tells you. The rest of the time, it stays out of your way.
Free. Arcaeon-setup-0.1.5.exe, 39.1 MB. The build is not code-signed, so your computer may warn you before it runs.
Before you run it, check it: its SHA-256 is 383e498420f2f30878726993035416a4116cfa835cf38a3a7cbd2fe37b1ee5df. In PowerShell, Get-FileHash .\Arcaeon-setup-0.1.5.exe should print the same.
There is no Linux download of this release.
Arcaeon gives you a record you can check.
seal.exe verify-bundle "BUNDLE.zip"
OK 0 problemsChecking is free, and needs no account. Check it yourself.
Why it helps
Your AI trusts its memory. You should be able to, too.
An AI assistant reads its memory and acts on it. If another program, an add-on or a person quietly edits that memory, your AI carries on as if the new words were yours. Nothing looks wrong. You find out afterwards, from a mistake.
Arcaeon makes that kind of change visible. You find out from a light, the moment it happens, not from the mistake.
The spot
New laptop Monday.
55 seconds. Sound on.
the first-run tour does this on your own screen
Let's break one.
Every change the app seals is chained to the one before it.
GREEN practice_note.txt as it was sealed. All clear.
The spare key is on the top → bottom shelf.
RED practice_note.txt changed, and you did not OK it.
One word changed. One file named. Nobody had to take anybody's word for it.
The tour changes a practice file, not your real memory. Press This was me and the light goes back to green.
What Arcaeon does
- Watch
- Seal
- Tell
- Check
- Stamp
Runs quietly
It can start with your computer and sits by your clock. While nothing changes, you do not hear from it.
Speaks up only when it matters
When a file changes and you did not OK it, the light turns red and you get one alert. If it was you, press This was me and it goes back to green.
Stamps what matters
Stamp a file on this site: its fingerprint goes on the public record with a time anyone can check later. 3 free a day. Stamp a file.
Read the light
Four colours, each with its own shape.
The same ring shows in the app and on this site. Each colour has its own shape and mark, so it reads without colour too.
Green: all clear
Nothing changed behind your back. Every file is as it was when it was last sealed or OKed.
Red: look
Something changed that you did not OK. The app names the file and shows what changed.
Amber: could not confirm
It could not confirm your record right now, for example a check that is late or could not run. Never a pass.
Grey: not checking
You paused checking, or it is not set up yet.
It tells you about changes. It does not undo them. What to do next is your call.
Get started
A few minutes, and you have seen it work.
On this computer
- Download the app and check its SHA-256 against the one beside the button.
- Install it and open it. A five-step tour starts, and the app builds your AI's memory folder.
- In the tour, the app changes one word in a practice file. The light turns red. Press This was me and it turns green. That is what a real alert looks like.
For your AI
Arcaeon has an MCP server.
In the desktop app
The app carries its own MCP door, arcaeon-seal-mcp: eight tools over stdio
that keep your AI's notes in a sealed store you own. Connect, in the app, sets it up for
your AI app. For agents.
for developers
From the command line
The free arcaeon package has an MCP server of its own, over stdio:
pip install "arcaeon[mcp]"
arcaeon mcpClient setup: The arcaeon package.
One important catch
It does not prove the memory is true.
If your AI writes down something wrong, Arcaeon keeps it faithfully. What it shows is narrower: whether a file changed after it was saved, and whether you OKed the change. It cannot see changes while it is closed; it checks again when it opens. And on its own it cannot catch a whole folder that was wiped, rewound or cut short: that needs a pin with the outside witness. The app carries its own witness client: one switch in the app, Pin to our witness, turns pinning on.
Why it exists
Built for the day the record gets pulled.
There is a record, and someone else pulls it. When they do, it should stand on its own, checked by someone who believes none of it.
A record nobody can check is not a record. It is just a story with better formatting.
Pick a door
For your AI
The MCP door: eight tools, notes in a sealed store your person owns.
For agentsthe browser checker is
LIVE ON THIS SITEFor you
Check a record with the seal checker that comes with the app, or in your browser. No account.
CheckOn this site
Every page, and what is real today.
- IN THE APPHow it works
The light, the first-run tour, and what 0.1.5 says no to.
- Pricing
Free pins and packs. Membership: not on sale yet.
- IN THE APPCheck it yourself
the browser checker is
LIVE ON THIS SITEThe seal checker comes with the app and needs no Python. In a browser: Check a record.
- IN THE APPCourt packet
One note and the proof it matches the record. Not legal advice.
- IN THE APPFor agents
The MCP door: eight tools, a sealed store the person owns.
- IN THE APPCan and cannot
Limits first.
For developers
The arcaeon packageThe command line package: Shipped ยท v0.10.0 on PyPI.
The download is free and open to everyone: at the top of this page.