Kastel at a glance
The official description
Three lengths, ready to use as they are. Written to be pasted without rewriting.
Kastel is the sovereign context layer for companies: it structures a company’s knowledge, makes the company own it, and exposes it to the AI models of its choice.
Kastel isn’t an AI. It’s the layer a company owns: its organisation, its processes, its responsibilities and its memory, structured into files that belong to it, then exposed over the MCP protocol to the AI models of its choice. The company decides what each AI is allowed to see, swaps the model in one click, and leaves with everything whenever it wants. Proprietary engine, open interface. Hostable in Europe or on its own infrastructure.
Kastel is the sovereign context layer for companies. Every day, a company teaches its trade to an intelligence it does not own: its processes, its decisions and its memory end up with a vendor who can cut off access, change the price or shut the service down. Kastel takes the opposite bet. It builds, structures and governs a company’s knowledge in files the company owns, then exposes it over the MCP protocol to the models of its choice, from Claude to a model running on its own premises. The company decides what each AI is allowed to see, and switches vendor in one click without moving anything. Kastel runs no model and never resells inference: the customer plugs in their own keys. The complete core is free forever on the customer’s infrastructure; hosted plans run in Europe, on one isolated instance per customer. Kastel is published by Pharos, in France.
The founder
Alexis Prat, founder of Kastel, an entrepreneur in tech for the past ten years.
Alexis Prat is the founder of Kastel. An entrepreneur in tech for the past ten years, he founded Albus Factory, where he runs AI in production every day. That is where he saw the problem Kastel solves: a company that teaches its trade to an intelligence it does not own ends up unable to do without it, and unable to take it back.
Alexis Prat is the founder of Kastel, the sovereign context layer for companies. An entrepreneur in tech for the past ten years, he founded Albus Factory, where he runs AI in production every day and where he saw the problem Kastel solves: a company’s knowledge ends up with a vendor who hosts it, charges for it and can take it back. His conviction comes down to one thesis: within two or three years all models will be roughly equivalent, and the advantage will no longer come from the model but from owning your context, the layer that does not become a commodity. That is the exact opposite of the incumbents’ model, whose business is lock-in. He argues the case publicly and without hedging, and Kastel is the proof it can be built: a free core on the customer’s own infrastructure, total export, an interchangeable model.
« A company’s knowledge is the company. Not its servers, not its tools. It. The day that knowledge moves to a vendor, the company loses something it does not get back. We built Kastel so that stops happening. »
Logos
The official files, unretouched. SVG for screen and print, PNG for any tool that does not handle vector fonts.
Usage rules
These files are made available for editorial use, unmodified. Any other use, commercial or promotional in particular, requires our written agreement.
What you may do
- Reproduce the logos as they are to illustrate an article, a report or a talk.
- Resize them while keeping their proportions.
- Leave clear space around the logo at least equal to the height of the symbol.
- Quote the founder and the descriptions on this page, with attribution.
What we ask you not to do
- Change the colours, proportions, typeface or angle of the logo.
- Add an outline, a shadow, a gradient or any effect.
- Combine it with another logo, or place it next to a brand in a way that suggests a relationship that does not exist.
- Imply a partnership, a named customer or a certification we do not have.
Colours and typography
Colours
The brand accent, on light surfaces.
The official variant on dark backgrounds, where IKB under-contrasts.
Text on light, and the canvas in dark mode.
The default surface. The brand is light first.
Reserved for the managed hosting signal. Used nowhere else.
Typography
Never italic: that is a brand rule, not a layout preference.
Interface views
Three views of the Kastel console, the one a company uses to see and govern its own Kastel.
These images are interface views rendered from our reference mockups, not screenshots of the running application. They show the real layout and vocabulary. For screenshots of the application, write to us.
The company map
Every department, what is covered, what is still waiting for approval. The first thing an executive sees.
A department in detail
What the company knows about a department, who decides there, and what the AI models have done.
An AI asking for access
What a person sees when an outside AI asks for access to their Kastel: exactly what it authorises, and the right to refuse.
Press contact
press@kastel.aiA question, an interview request, a visual this page does not cover. Write to this address and you will get an answer.
Spokesperson
Alexis Prat, founder, speaks readily about digital sovereignty, dependency on AI vendors, and how a company can own its own context. Available for interview, in French and in English.
Kastel on LinkedIn