KeepstoneYour second brain for your own AI

Terms and conditions

Version 1.1 · effective from 10 October 2026. For business customers only.

Article 1. Definitions

  1. Keepstone: Den Otter Consulting, trading as Keepstone, Chamber of Commerce (KVK) 94619735.
  2. Customer: the business that buys Keepstone in the course of its trade or profession.
  3. Second brain: the instruction and the files that Keepstone makes for the customer, and the versions of them for the customer's AI.
  4. Setup: the one-off service in which Keepstone makes the first second brain.
  5. Refresh: updating an existing second brain based on what has changed.

Article 2. Scope

  1. These terms apply to every purchase through keepstoneai.eu.
  2. The customer's own terms do not apply.
  3. At checkout the customer expressly accepts these terms and can save them.
  4. A business customer declares at checkout that it buys for its business and gives its business name. A private individual who buys anyway falls outside the offer. Keepstone refuses that purchase and refunds the full amount, as long as the interview has not started.

Article 3. Formation of the contract, prices and payment

  1. The contract is formed as soon as the payment through Stripe has succeeded. The customer receives a confirmation by email.
  2. Prices exclude VAT. VAT is shown on the invoice.
  3. Payment is made in advance through Stripe, in the currency shown at checkout.

Article 4. Performance

  1. After payment the customer gets access to the intake form and then to the interview.
  2. The interview is conducted by an AI and the draft is made with AI. This is stated at the start of the interview.
  3. Every draft is personally checked before the customer receives it. Keepstone aims to deliver within one working day after the interview.
  4. The customer makes sure its information is correct and that it may share the documents it uploads.
  5. The customer does not provide special category data of others, such as health data of clients. If the customer is bound by a legal duty of confidentiality, it says so in the form.

Article 5. Delivery and storage

  1. Keepstone delivers the second brain through a personal download link. The link is valid for 14 days after delivery.
  2. The customer keeps the second brain itself. No later than 30 days after delivery, Keepstone deletes the uploads, the answers and the draft. After that, Keepstone cannot deliver the second brain again.

Article 6. The second brain and the customer's AI

  1. The second brain is a tool. The customer remains responsible for what it does with the output of its AI.
  2. The customer chooses which AI it puts the second brain in (Claude, ChatGPT, Gemini or Copilot). Keepstone is not responsible for how that AI service works. That service is governed by the provider's terms.
  3. The customer reports defects in the second brain within 14 days of delivery. Keepstone then corrects them free of charge.

Article 7. Refresh

A refresh is a one-off service, with the same steps as the setup in a shorter form. These terms apply to it in the same way.

Article 8. Cancellation and refunds

Keepstone is sold to businesses. The statutory right to cancel for consumers therefore does not apply. As long as the customer has not started the interview, it can cancel the order and receives the full amount back. Once the interview has started, Keepstone does not give a refund. Keepstone corrects defects under article 6.

Article 9. Intellectual property

  1. The content of the second brain about the customer's business belongs to the customer.
  2. The structure, the instruction text and the templates remain Keepstone's. The customer may use them without limit for its own business.

Article 10. Liability

  1. Keepstone's liability is limited to the amount the customer paid for the service concerned.
  2. Keepstone is not liable for indirect or consequential loss, such as lost revenue or lost data.
  3. Nothing in these terms limits or excludes Keepstone's liability for intent or deliberate recklessness, for death or personal injury caused by negligence, for fraud or fraudulent misrepresentation, or for any liability that cannot be limited or excluded under applicable mandatory law.

Article 11. Force majeure

  1. Keepstone is not liable for delay or failure to perform caused by circumstances beyond its control. These include outages at third-party services, such as Anthropic, n8n, Microsoft, Stripe, Cloudflare and Cloud86, and failures of the internet.
  2. If the force majeure lasts longer than 30 days, either party may terminate the contract. The customer then receives back what it paid for the part that has not been performed.

Article 12. Privacy

The privacy statement and, for data about others, the data processing agreement form part of the contract.

Article 13. Complaints

The customer sends complaints to [email protected] and receives an answer within 14 days.

Article 14. Governing law and disputes

  1. These terms and the contract are governed by Dutch law.
  2. Disputes are submitted to the competent court of the District Court of Oost-Brabant (rechtbank Oost-Brabant).

Article 15. Final provisions

  1. These terms exist in Dutch and English. If the versions differ, the Dutch version prevails.
  2. Keepstone may change these terms. An order is governed by the terms that applied at the time of purchase.
  3. If a provision is void or is annulled, the other provisions remain in force. The provision concerned is replaced by a valid provision that comes as close as possible to its purpose.