Models come, go and get replaced. In den, memory stays separate from the model: when you switch models, the knowledge, decisions and context you have built up stay where they are.
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Works with Anthropic models, with open-source models running locally through Ollama, and with OpenAI-compatible endpoints. The model is a setting; the memory is not.
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The memory lives in plain Markdown files; you can open, read and back them up with Obsidian. Even if you change the model, the memory stays the same.
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MCP-capable AI tools and agents read the memory. Writes go through your approval by default; agent access is recorded in an audit trail.
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In the Portable edition, the memory goes into an end-to-end encrypted package and is restored on another device with your recovery phrase.
You choose the AI. The memory stays with you.
Memory
The same network across four periods. Every new experience becomes a node, every decision a link. Your memory grows as you work.
No experience is ever wasted.
Institutional knowledge lives in people's heads; when they leave, the memory leaves with them.
The same mistakes, the same negotiations, the same decisions get replayed from scratch.
Decision-makers spend their time not on knowledge, but on trying to remember.
Everything you live through should have been accumulating somewhere.
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Emails, calendars, documents and AI chats; it brings the data you already produce into one place.
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Builds a living knowledge graph linking people, organizations, projects and decisions.
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Ask, and get memory with context and reasoning — not a list of search results.
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The network grows with every new experience; it tracks the consistency of your decisions over time.
Other similar tools wait for you to take notes. den remembers for you.
The memory den keeps is the memory of you and your organization — a second brain. MCP-capable AI tools connect to the same memory.
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Your decisions, your reasoning, the paths you didn't take. Ask 'what did I think about this last year?' and it answers with date, context and rationale.
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With an On-Site installation, contracts, emails, documents and projects become a connected memory network; knowledge no longer depends on anyone's recollection.
Ask, and your memory answers with source cards.
Links between people, organizations, projects and decisions are extracted automatically.
The reasoning stays; it warns you when the past is contradicted.
Produces tables, pages and documents from your memory.
What your memory is doesn't change; you choose where it lives.
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The memory runs on your organization's own infrastructure; data never leaves your building. Role-based access is on the roadmap. For organizations and decision-makers.
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The memory sits in an end-to-end encrypted package in the cloud and is restored on any device you choose. Only you hold the key — no one else can open the package. For individuals.
In the On-Site edition, den runs on-premise. Your data stays on your own infrastructure; the architecture is built for data protection rules (KVKK / GDPR), and data never leaves the country. If you choose, it runs entirely air-gapped on open-source models.
We built den for ourselves first. Our founder's years of correspondence, projects and decisions are now a living second brain. We don't give sales pitches; we talk to our own den.
Case study — Coming soonYour organization's memory is ready to talk to you.
Our solutions: Digital & AI Transformation, Industry, Construction and Real Estate.