Keystone AI

Legal

Terms

Last updated: 26 September 2026

About these terms

These terms apply to your use of keystoneai.ltd and to the services Keystone AI Ltd ("Keystone AI", "we", "us") provides. Keystone AI Ltd is a private limited company registered in England and Wales, company number 17476306, registered office 71-75 Shelton Street, Covent Garden, London, WC2H 9JQ. You can contact us at hello@keystoneai.ltd.

Every piece of client work is set out in a written proposal or statement of work. If anything in a proposal conflicts with these terms, the proposal takes priority.

Using this website

You may use this website for lawful purposes. Its content is provided for general information; we work to keep it accurate but it is not advice for your specific situation. The site's design, text and graphics belong to Keystone AI Ltd unless stated otherwise, and may not be copied for commercial use without our permission. Links to other websites are provided for convenience; we are not responsible for their content.

Proposals and quotes

Proposals and quotes are valid for 30 days unless they say otherwise. Work begins once you have accepted a proposal in writing (email is fine) and paid any deposit it specifies.

Fees and payment

  • Fees are as set out in the proposal, which will state whether VAT applies.
  • Invoices are payable within 14 days of the invoice date.
  • For larger projects we may ask for a deposit before work starts, with the balance invoiced at agreed milestones or on completion.
  • Where you are a business, we may charge statutory interest and compensation on late payments under the Late Payment of Commercial Debts (Interest) Act 1998.
  • Some services depend on third-party subscriptions — for example hosting, domain names, email or AI services. Unless the proposal says otherwise, those costs are yours and are subject to the provider's own terms.

What we need from you

To deliver on time we rely on you to provide content, information, access and decisions when agreed. You confirm that you have the right to use any material you give us — text, photographs, logos, data — and that our use of it for your project will not infringe anyone else's rights. If delays on your side affect the timetable, we will agree a revised one with you.

Ownership of the work

  • Once you have paid in full, you own the work created specifically for you under your proposal — for example your website's design and content.
  • We keep ownership of our own pre-existing materials, software, tools, products and know-how, including anything we develop for general use (such as our quotation-building tool). Where these form part of what we deliver, you receive a licence to use them for your business as set out in the proposal or the product's own terms.
  • Open-source and third-party components remain subject to their own licences.
  • We may describe our work for you in our portfolio and marketing, unless you ask us not to.

AI-assisted tools and outputs

Some of our tools and services use artificial intelligence. AI output can be wrong or incomplete, so you remain responsible for reviewing anything produced with our tools — such as a quote, a price or customer-facing text — before you rely on it or send it to anyone.

Confidentiality and data protection

We keep confidential any non-public information you share with us, and use it only to deliver our services. Where we process personal information on your behalf, we do so as your data processor, under a written agreement that meets UK data protection law. Our privacy policy explains how we handle personal information as a controller.

Our responsibility to you

  • We will carry out our services with reasonable skill and care.
  • Nothing in these terms limits our liability for death or personal injury caused by negligence, for fraud, or for anything else that cannot legally be limited.
  • Where you are a business, we are not liable for loss of profit, revenue, data or goodwill, or for indirect or consequential loss, and our total liability arising from a project is limited to the fees paid for that project in the 12 months before the claim arose.
  • We are not responsible for failures of third-party services we do not control, such as hosting, email or AI providers, though we will help you resolve them.

If you are a consumer

If you are buying as an individual rather than for a business, you have legal rights under the Consumer Rights Act 2015, and nothing in these terms affects them. Where a contract is agreed at a distance, you may usually cancel within 14 days; if you ask us to start work within that period, you may have to pay for work already done.

Ending an engagement

Either of us may end an engagement by written notice if the other seriously breaches these terms or the proposal and does not put it right within 14 days of being asked. You will pay for work completed up to the date the engagement ends.

General

These terms and any dispute arising from them are governed by the law of England and Wales, and the courts of England and Wales have jurisdiction. If any part of these terms is found unenforceable, the rest still applies. We may update these terms from time to time; the version in force when a proposal is accepted applies to that work.