Legal document · effective June 16, 2026

Terms of Use

These Terms of Use govern your access to and use of the Keystro desktop application, web dashboard, API, and related services (together, the "Service"). By creating an account or installing the desktop application, you agree to these terms.

1. Definitions

• "Provider", "we", "us" — Boris Molton, sole proprietor operating under the Keystro brand, registered in France under SIREN 105 659 270 (see Mentions légales).
• "User", "you" — any natural person or legal entity using the Service.
• "Service" — the Keystro desktop application, web dashboard at keystro.ai, backend API, and any related feature.
• "Output" — the text generated by the AI in response to your input.
• "Account" — your personal user account created via the authentication provider (Clerk).

2. Eligibility and account creation

• You must be at least 16 years old to create an account.
• You must provide accurate information (email, name) and keep it up to date in your profile.
• You are responsible for keeping your authentication credentials secure. Notify us immediately at contact@keystro.ai if you suspect unauthorized access.
• One account per individual. Accounts are personal and non-transferable. You may not create multiple accounts to circumvent quota limits.
• We reserve the right to refuse, suspend, or terminate any account that violates these terms or applicable law.

3. License granted to you

Subject to your compliance with these Terms, we grant you a limited, non-exclusive, non-transferable, non-sublicensable, revocable license to:

• Install and run the desktop application on devices you own or control;
• Access the web dashboard and submit AI requests for your own personal or professional use;
• Use the Output for any lawful purpose, personal or commercial.

4. Acceptable use

You agree NOT to use the Service to:

• Generate, distribute, or store content that is illegal, defamatory, infringing, hateful, harassing, sexually explicit involving minors, or that promotes violence;
• Submit content you do not have the right to process (confidential information of third parties without authorization, copyrighted material you cannot lawfully use, personal data of others without legal basis);
• Attempt to extract, reverse engineer, decompile, or disassemble the desktop application, the backend API, or the prompts used to generate Output, except to the extent strictly permitted by mandatory applicable law;
• Probe, scan, or test the vulnerability of the Service, or breach its security or authentication measures;
• Use the Service to build a competing product, a derivative AI service, or to train another AI model on the Output;
• Resell, sublicense, or grant API access to third parties (the Service is for end-user use, not as an upstream API for your own product);
• Interfere with or disrupt the Service, including by sending excessive requests, attempting denial-of-service, or circumventing quota or rate-limiting mechanisms;
• Create multiple accounts, share accounts, or use automated tools to obtain additional free quota beyond what is allowed;
• Submit data subject to special regulatory regimes (medical records, classified information, payment card data, etc.) — the Service is not certified for such uses.

5. AI-generated content

Transparency notice (EU AI Act, Article 50). Keystro is an artificial intelligence system. When you use the Service, you are interacting with an AI system, and the Output is generated by automated means rather than authored by a human.

Keystro uses third-party large language models (currently OpenAI's GPT family) to process your input and generate Output. You must be aware that:

• AI-generated content may be inaccurate, biased, or outdated. You are responsible for reviewing the Output before using it in any consequential context (legal, medical, financial, etc.).
• The same input may produce different Output across requests. The Service does not guarantee any specific result.
• You retain all rights, title, and interest in your input. To the extent any intellectual-property right vests in the Output, we hereby assign such rights to you, subject to your compliance with these Terms.
• You are solely responsible for your use of the Output, including any decision to publish or distribute it.
• Output is not legal, medical, financial, or other professional advice. Use it as a drafting aid, not as a substitute for qualified human judgment.

6. Quotas and fair use

• The Free plan includes 50 AI requests per rolling month. The Pro and Pro+ plans include higher monthly request limits, as detailed in the pricing section of our website.
• Quotas are enforced server-side. Once your monthly quota is exhausted, you must wait for the next reset or upgrade your plan.
• We may temporarily rate-limit individual requests to maintain Service stability for all users.
• We may revise quotas with at least 30 days' notice. Reductions will not apply retroactively to a billing period already paid for.

7. Intellectual property

• Our IP. The Keystro brand, name, logo, source code, prompts, documentation, and the Service as a whole remain the exclusive property of Boris Molton. Nothing in these Terms transfers ownership of the Service to you.
• Your content. You retain all rights to your input and to the Output. We claim no ownership over either. We also do not store either (see Privacy Policy).
• Feedback. If you send us suggestions, ideas, or feedback, you grant us a perpetual, irrevocable, royalty-free license to use them to improve the Service.

8. Privacy

Our handling of your personal data is described in detail in the Privacy Policy, which forms an integral part of these Terms.

9. Suspension and termination

By you. You may stop using the Service or delete your account at any time from the dashboard. Account deletion cascades to all associated data (profile, vocabulary, subscription, usage events).

By us. We may suspend or terminate your access:

• Immediately and without prior notice, if you breach these Terms in a way that risks harm to other users, our infrastructure, or our reputation;
• With at least 14 days' notice, for any other material breach you have failed to remedy;
• With at least 30 days' notice, if we discontinue the Service entirely. In that case, we will pro-rata refund any prepaid period not yet consumed.

Upon termination, the licenses granted under section 3 immediately end. Sections 5 (your responsibility for Output), 7 (IP), 11 (warranties), 12 (liability), 13 (governing law) survive termination.

10. Changes to the Service and to the Terms

• We continuously improve the Service. Non-material changes (bug fixes, performance improvements, UI tweaks) are deployed as needed.
• For changes that materially reduce a feature you actively use, we will notify affected users at least 30 days before the change.
• We may update these Terms. Material changes will be notified by email at least 30 days before they take effect, with the new effective date displayed at the top of this page. If you do not agree with the changes, you may terminate your account before they take effect.

11. Disclaimer of warranties

To the maximum extent permitted by applicable law, the Service is provided "AS IS" and "AS AVAILABLE", without warranties of any kind, whether express, implied, statutory or otherwise, including warranties of merchantability, fitness for a particular purpose, accuracy of Output, non-infringement, or uninterrupted operation.

Nothing in this section limits the legal warranty of conformity owed to consumers under French law (Code de la consommation art. L.217-3 et seq.) or the warranty against hidden defects (Code civil art. 1641 et seq.) where applicable.

12. Limitation of liability

This section applies only to Users acting for professional purposes (B2B). The monetary cap below does not apply to consumers within the meaning of the preliminary article of the French Consumer Code, who are not subject to any contractual limitation of liability and retain the full extent of the rights and remedies granted to them by mandatory law.

For professional Users, to the maximum extent permitted by applicable law, our aggregate liability arising out of or relating to the Service shall not exceed the greater of (i) the amount you paid to us in the twelve (12) months preceding the event giving rise to the claim, or (ii) one hundred (100) euros.

We shall not be liable for indirect, incidental, special, consequential or punitive damages, lost profits, lost revenue, lost data, business interruption, or any damage resulting from the use or inability to use the Output.

Nothing in these Terms excludes or limits our liability for fraud, gross negligence, wilful misconduct, death or personal injury caused by our negligence, or any other liability that cannot be excluded by law. Consumers retain all rights granted to them by mandatory consumer protection law, which prevail over any contrary provision of these Terms.

13. Indemnity

This section applies only to Users acting for professional purposes (B2B). Consumers within the meaning of the preliminary article of the French Consumer Code are excluded from the indemnity obligation set out below.

If you are a professional User, you agree to indemnify and hold harmless the Provider from any claim, loss, or expense (including reasonable legal fees) arising from your breach of these Terms, your violation of applicable law, or your infringement of third-party rights through your use of the Service.

14. Force majeure

Neither party is liable for failure to perform caused by events beyond its reasonable control, including (without limitation) acts of God, war, terrorism, civil disturbance, labor disputes, pandemics, government action, internet or telecommunications outages, or failures of third-party providers.

15. Governing law and jurisdiction

These Terms are governed by French law. Any dispute relating to these Terms or to the Service shall, after a good-faith attempt at amicable resolution and after the consumer mediation procedure described below, be brought before the competent French courts.

For consumer users, mandatory provisions of the law of your country of residence apply, and you may bring proceedings before the courts of your domicile.

16. Consumer mediation

In accordance with French Consumer Code articles L.611-1 et seq., consumer users may refer disputes to a consumer mediator free of charge. Our designated mediator is [Mediator name and contact — to be confirmed before opening paid plans to the public].

Consumers in the EU may also use the European Online Dispute Resolution platform: ec.europa.eu/consumers/odr.

17. Miscellaneous

• Entire agreement. These Terms, together with the Terms of Sale, the Privacy Policy, and the Mentions légales, constitute the entire agreement between you and us regarding the Service.
• Severability. If any provision is held unenforceable, the remaining provisions remain in full force and effect.
• No waiver. Our failure to enforce a right is not a waiver of that right.
• Assignment. You may not assign these Terms without our prior written consent. We may assign these Terms to an affiliate or in connection with a merger, acquisition, or sale of assets.
• Notices. Notices to you may be given by email to the address associated with your account. Notices to us must be sent to contact@keystro.ai.

See also: Privacy Policy · Terms of Sale · Mentions légales (FR)