Mnemosyne OS

Mnemosyne OS · Infinity Edition · v1.3

Everyone is building the intelligence.
Mnemosyne builds the relationship.

Not one more model. The memory and context that make an AI actually know you — across sessions, across projects, across time. On your machine, encrypted, and it never leaves.

The lawyer resonates over her case files offline, under privilege.

Download — free The relationship layer

Memory graph topology

These aren't decorations. They are six of the nineteen surfaces the engine can inhabit, drawn here from their real equations. Click: the memory recomposes.

  • Zero-trust

    Even locally, nothing is taken on trust: every SDK and MCP request carries its signed token.

  • Security by design

    The one dangerous move — engraving a memory in stone — is unreachable from the network. It takes your hand.

  • No account

    No signup, no mandatory server, no password to lose. You download and you launch.

  • Your key, or credits

    Plug in your own API key. Or take metered credits. Or no cloud at all: the engine runs entirely on your machine.

The interface

What you see when you open it.

Not mockups. The real app — your memory map, the models, your notes, the cartridge hub.

The Neural Map — the memory graph rendered as a mathematical topology
The Neural Map: your memory rendered as a living mathematical topology. Every node is a memory, every edge a measured semantic link — here the Enneper surface, drawn from its real equation. Nineteen topologies to choose from.
Multi-model configuration: one model for memory, one for intelligence
Multi-model by design: one model for memory, one for intelligence. 100% local, cloud, or hybrid — Gemini, Claude, OpenAI, Groq, Mistral, DeepSeek, Ollama.
Sovereign Notes — the local, classified note editor
Sovereign Notes: you write in a local, classified vault. Every note is embedded, retrievable, and feeds the same memory your agent draws on.
MnemoHub — build, sign and publish a cartridge
Build a cartridge on the SDK, sign it with your sovereign wallet, publish it. Draft → signed → in review → listed: every entry carries your signature.
The Neural Map — the same graph wound onto a torus
The same graph, wound onto a torus and tuned live. The topologies aren’t decoration: the shape is the equation.

The number

72.9% on the variant nobody cites.

72.9% LongMemEval-M, full-haystack variant:
~480 distractor sessions per question.
The honest one. The hardest one.

We ran the full-haystack — the one the industry doesn't show — and we publish the result as a floor, not a ceiling: other categories and other models are still to be re-run. The protocol, the full measurement table, and what we miss are all open.

See all the measurements Audit the score yourself ↗

Go further

01

The manifesto

Why the relationship, not the intelligence. Identity, history, continuity — and why it's an "OS".

Read →

02

How it works

The local architecture, the four mechanisms, the nine core modules.

See →

03

Developers

The open SDK, the sandbox covenant, the open-core. Build on it.

Build →

Also: the roadmap · the team

License

$70. Once. For life. Or zero, if you build with us.

The download is free, and it isn't a crippled demo: vectorisation, search, chat with your own keys, system voice. The whole OS. Three doors, and the second one is open.

Base

0 $

  • The full memory OS, local
  • Encrypted vaults, search, neural map
  • Your API keys, your models, your call
  • The system voice
  • One cartridge outside the catalog

Windows · macOS · Linux

Founders license

70 $ · once

  • Everything above, for life
  • Unlimited cartridges, even outside the catalog
  • The enhanced voice engine — local neural voices
  • Reserve your pseudonym on the Mnemosyne system
  • The reserved features and cartridges
  • The license is an asset you hold, not a subscription you rent
  • The licensee-only app (in development)
  • The price rises with each version

Bought in the app · by card

And one more door. Every founders license opens an app we keep for licensees — in development, not shown yet. From Monday, the license and the cloud credits are bought inside the app, from your own wallet: nothing to copy, nothing to paste.

See the licenses Download the app

The principle

Memory perceives, situates and reveals.
The human governs.

It never deletes in silence. It never judges truth. It never mixes two domains of your life without you saying so. This isn't a value pinned to a page: it's a constraint carved into the code, and it's why there are things this software cannot do.