Think deeper.
Build context that lasts.
Cosensai is a privacy-first cognitive workspace. Custom AI personas, an auditable memory graph, and actionable tools. All running on infrastructure you control.
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CoSensAI
The name is intentionally layered. It holds a different meaning depending on how you read it. That is the point.
Cognitive Senses + AI
AI that truly perceives: not just text, but audio, images, code, context. Each Sensai persona has its own configurable Senses: vision, audio, browsing, and more. You are not talking at a chatbot. You are sharing awareness with something that observes the same world you do.
From TERMINOLOGY.md: Senses are the input/perception layer of each Sensai, from screenshot analysis to transcribed speech.
Sensei: Master & Teacher
In Japanese, Sensei (ๅ ็) means a master who has walked the path before you. Your digital Sensai is not a generic assistant. It has its own Knowledge, earned over time, scoped to you. It remembers what a sensei remembers: not everything, but the right things.
A Sensai's Knowledge is private to the user+sensai pair. It learns your style, your context, and your preferences, separate from every other user.
Sensing Together
The "Co" is deliberate. This is not AI replacing your judgment. It is AI alongside you. You notice things, the Sensai notices things. The name rejects the idea of a subservient chatbot and proposes something more like a co-author, co-researcher, or co-pilot who grows with you.
Multiple Sensai personas exist for cognitive diversity, each with a different perspective, tone, and equipped Skills for different modes of working.
" CoSensAI: the name you can read three ways. Choose the one that resonates. They're all true. "
We believe AI should expand your mind,
not replace it.
In a world of black-box models and cloud-only intelligence, we act as a counterweight. Cosensai is built on the principle of Human-AI Symbiosis.
It is not just a tool you use. It is a system that adapts to you. By observing your work, indexing your decisions, and surfacing context when needed, it becomes a durable extension of your cognition. Everything remains traceable and exportable. What it remembers, you control.
But this depth of intimacy requires absolute trust. That is why we are uncompromising on Digital Sovereignty. Your memories, your graph, and your models run primarily on your local machine or an EU-server you dictate. Cosensai does not use your data to train AI models.
Built for how you actually think
Not another chat wrapper. Cosensai is a complete thinking environment that learns with you.
Sensais: Your Digital Sensei
Not a chatbot. Each Sensai has its own Senses (vision, audio), Skills (MCP tools), and Knowledge (domain memory). One for research, one for writing, one for code review. Each grows independently with you.
- Senses, Skills & Knowledge per persona
- Portable via Capsule export
- Multi-model slot assignment
Memory Governance
Cosensai extracts semantic memories from your conversations automatically. Every memory is auditable: you can view, edit, or delete any fact the AI has learned. Architecture supports GDPR Art. 17 & 20.
- View, edit & delete any memory
- Semantic vector search
- User-global + Sensai-scoped memory
Knowledge Graph
Visualize how your ideas connect. Notes, tasks, memories, and conversations form an interactive constellation of your thinking.
- Interactive force-directed graph
- Bi-directional entity links
- Navigate your entire knowledge base
Smart Notes
Rich-text notes with AI assistance, automatic linking, and bi-directional references. Your second brain, powered by AI.
- Rich-text / Block editor
- Auto-link to entities
- Save as templates
Intelligent Tasks
Natural language task creation, AI-powered prioritization, dependencies, and subtasks. Linked to your projects and notes.
- Natural language input
- Subtasks & dependencies
- AI auto-titling
Projects & Teams
Organize work into projects with milestones and progress. Invite teammates and collaborate in real-time.
- Real-time collaboration (Yjs)
- Progress tracking
- Team workspaces
Calendar
A unified calendar that connects your scheduled events to your tasks, notes, and memory. Every event carries context.
- Event-task linking
- MCP integration
- Smart scheduling view
Tables & Databases
Build structured databases right inside your workspace. Flexible columns, filters, and views for any data.
- Custom column types
- Filtering & sorting
- Linked to entities
Universal Search
Semantic search across everything: chats, notes, tasks, memories, files. Instant results. No more hunting.
- Vector + keyword hybrid
- Cross-workspace search
- Instant results
Voice Input
Speak your thoughts and Cosensai transcribes them using local Whisper models. Works offline.
- Local Whisper model
- Auto-transcription
- Voice-to-memory
Sensai Skills (MCP)
Equip each Sensai with Skills via the Model Context Protocol: GitHub, Linear, file system, web browsing, and 100+ more. First PKM tool with native MCP server + client.
- Native MCP (server + client)
- Per-Sensai skill slots
- Custom tool creation
Privacy Proxy
Automatic PII anonymization before any data reaches a cloud LLM. Names, emails, and sensitive entities are replaced with synthetic tokens and restored transparently on return.
- Automatic PII detection
- Synthetic token substitution
- Zero competitors offer this
How experts use Cosensai
Project Brain
Stop losing project context in Slack. Store decisions in notes, let your Sensai track milestones, and turn meeting briefs directly into actionable task lists.
Research Hub
Throw PDFs, websites, and unstructured ideas into your workspace. Your Sensai can summarize themes, extract quotes, and help you discover links across hundreds of sources.
Meeting-to-Memory
Take rough meeting notes. A specialized Sensai automatically distills them into a polished summary, links mentioned colleagues, and extracts action items into your pending tasks.
Personal Operating System
A private journal that thinks with you. Reflect on your goals with a completely local AI model that ensures your intimate thoughts never touch a public cloud server.
Your first 5 minutes in Cosensai
See how quickly your workflow upgrades from scattered notes to an intelligent system.
Import your brain
Bring in your Markdown files or Notion exports. Cosensai instantly indexes them into a semantic graph.
Create a Sensai
Spawn a 'Project Manager' persona and assign it access to your new notes and calendar.
Ask a hard question
"What did we decide about the EU rollout last week?" The Sensai checks your imported notes to find the exact context.
Generate real action
Tell the Sensai: "Turn that decision into a checklist." It creates 5 linked tasks straight into your project board.
Three concepts that change everything
Cosensai is built on ideas that make AI feel personal for the first time.
Your digital sensei
A Sensai is an AI persona you craft, not a generic chatbot. Each Sensai has a name, a role, a tone, and a growing body of knowledge unique to you and that persona. Think of it as a specialist colleague who knows your exact context.
One Sensai might be your strategic thinking partner. Another might be your code reviewer. Each develops its own memory of what matters to you in its domain.
The mind that grows with you
Cosensai's Memory system automatically extracts key insights from your conversations and stores them as semantic memories. Unlike a chat history, memories are retrieved by meaning, not just keyword.
Ask about a decision you made six months ago and the relevant context surfaces automatically, even if you never explicitly saved it.
Seeing the shape of your thinking
Every entity in Cosensai (notes, tasks, memories, chat threads, files) is a node connected to others. The Graph workspace makes these connections visible and navigable.
Discover unexpected patterns. See which projects your memories cluster around. Navigate your knowledge the way your brain actually works: by association.
EU-hosted by default.
Sovereignty by design.
We built Cosensai so that your core context lives where you dictate. Every piece of your data is stored by default on Hetzner servers in Germany. This ensures GDPR compliance and legal protection under EU laws.
How we built this
Discover the "vibe coding" journey behind Cosensai. Built by AI, for AI.
Cosensai vs. Others
See how we stack up against traditional note-taking apps and standard AI wrappers.
For Business
See how Cosensai breaks silos between SAP, Dynamics 365, and your SaaS apps using MCP.
Predictable AI scaling.
No per-seat AI taxes for core functionality. No hidden overages. Pay for the cloud intelligence you consume, or run everything locally at zero cost.
Personal use, 3 Sensais, Local/BYOK AI only
20 Sensais, managed credits, 50GB storage
Unlimited Sensais, 500GB storage, pro support
Ready to amplify your intelligence?
Join the growing community of thinkers, researchers, and builders using Cosensai to think deeper.
No credit card required ยท Free plan included ยท EU hosted