Pricing

Your fortress, hosted wherever you want.

By us in Europe, or by you, on your own infrastructure, in your own country. You plug in your AIs, you keep control.

Hosted and operated by Kastel

Choose by the size of your company.

Isolated hosting in Europe.

Kastel Solo

€39/ month

Up to 5 users

To get started, hosted effortlessly.

Hosted and operated in Europe by us

Track your AI cost (your own keys)

Join the beta

Kastel Team

€190/ month

Up to 20 users

When you work as a team.

Everything in Kastel Solo, plus:

Connect to your company directory (SSO)

Multi-hand approval, with separation of duties

A dedicated read-only role

Follow-up on pending requests

Join the beta

Kastel SMB

From

€590/ month

Up to 150 users

What your IT department expects.

Everything in Kastel Team, plus:

Cross-department approval chains

A readout of your sovereignty posture

Join the beta

Kastel Enterprise

On quote

Self-hosted or managed

What the auditor and the CISO require.

Everything in Kastel SMB, plus:

Regulatory compliance (AI Act)

Consolidated multi-site audit

Signed erasure proofs

Regulated package (healthcare, finance, public sector) tailored

Learn more

To plan for, on every managed plan: an API key at an AI provider, your own. Five minutes at signup, and you pay that provider directly, never us.

The cap is firm. Past it you move up a tier.

Kastel is currently in closed beta. Companies joining today get exclusive terms.

Join the beta

Team, SME and Enterprise also on your infrastructure, on quote.

Request a quote →

Kastel CoreFree

What’s yours is never billed.

The full core of Kastel, on your infrastructure. Your data behind your walls, and you decide who sees them.

Install on your server

The full core, no crippled edition

On your infrastructure, your rules

Full export in one command

Open interface (MCP), any model

What each plan unlocks.

The core is free and complete. Features follow your plan; Team and SME are also offered on your infrastructure, on quote.

	Kastel CoreFree · your server	Solo to SMEManaged or self-hosted	EnterpriseOn quote
Included users	Unlimited	From 5 to 150	On quote
Your Kastel & its memory
Your sovereign company memoryorganisation, process, entities, search
AI-guided structuringfrom your documents (PDF, even scanned), EN/FR
Private personal memoryper employee
Sourced answers + who-knows-whatcited answers, who knows, who decides
Health score + freshness digestthe state of your Kastel, every week
Score depthtrend over time, per-axis detail	–	–
Connecting your AIs
Plug in all your AIsClaude, ChatGPT, Mistral, local model… unlimited reads
All your tools connectedyour main tools, and the list keeps growing
Turnkey tool connectionspre-verified Google, Slack, Microsoft access	Your own access		Self-host or managed
Your AIs write into your Kastel, under controlno agent limit
Secure AI connection, revocable any time
Web consoledashboard, steering, AI cost
Collaboration & governance
Per-person permissions, roles and human approval
Multi-hand approval, with auditor role	–	from Team
Cross-department approvals	–	from SMB
Connect your company directory (SSO)	–	from Team
Governed emergency access + sovereignty readout	–	from SMB
Security & compliance
Security & GDPRencryption, audit log, governed erasure
Your own AI keys + control over data destination
AI Act compliance + consolidated multi-site audit	–	–
Tamper-proof erasure and audit proofs	–	–
Regulated packagehealthcare, finance, public sector	–	–
Hosting & freedom
Full export, open interfaceno lock-in, any time
Hosting	Your server	Europe, by us	Self-host or managed

See the documentation →

Frequently asked questions

I don’t want European hosting?

On your infrastructure, Kastel Core remains free and complete. Team, SME and Enterprise features can be purchased on quote, with a license verified online daily. You operate your installation in your region. Hosting operated by Kastel remains exclusively in Europe.

How do I leave? Am I locked in?

Never. Your data and your context belong to you. A full export in one command, at any time, and you take back control by hosting your Kastel yourself on your own servers whenever you want.

Do I need an AI key to start? And who pays for inference?

Yes, and it is required: your Kastel reads and builds nothing without an API key of your own, at the AI provider you choose (Anthropic, OpenAI, Mistral, DeepSeek, Kimi, or your own Amazon Bedrock account). Allow five minutes to create it. You pay that provider directly: Kastel never resells inference and takes no margin on it. That is what guarantees your context passes through no AI account of ours.

Is there a commitment?

Monthly, no commitment, cancel any time. And the full core self-hosted stays free.

Where is my data hosted when managed?

In Europe, on an isolated instance dedicated to your company, at Scaleway SAS, fr-par region (France). On the managed plan we run it for you: your data stays yours, reads are logged into a sealed audit chain, and a full export hands it back in one command, at any time. If you would rather trust no one with running it, the complete core is free on your own infrastructure.

Ready to build your fortress?

Join the beta Install on your server