Terms of Service
The rules of the road. By using the Quantum Circuit Simulator and Cryostat Studio, you agree to the terms outlined below.
April 17, 2026
1. Acceptance of Terms
By accessing or using this platform — including the Quantum Circuit Simulator, Cryostat Studio, and all associated content — you agree to be bound by these Terms of Service and our Privacy Policy. If you do not agree, please do not use the platform.
2. Accounts
To access premium features, you must create an account via Google OAuth. You are responsible for maintaining the security of your account and for all activity that occurs under it. You agree to provide accurate information and to notify us promptly of any unauthorized access.
3. Subscriptions & Billing
Premium features require a paid subscription processed through Stripe. By subscribing, you authorize recurring charges at the rate displayed at checkout. Subscription fees are billed in advance and are non-prorated for partial periods. We reserve the right to change pricing with 30 days' notice. Where Pro features are described as "unlimited," access is subject to the Service Limits and Fair Use section below.
4. Service Limits and Fair Use
Some Pro features are described on the pricing page and elsewhere as "unlimited." This means there is no predetermined numerical quota imposed by us under normal individual use. It does not mean access is guaranteed without any technical or practical limit. In particular: • Qubit count: The circuit simulator executes entirely in your browser and uses exact state-vector math. Each additional qubit approximately doubles memory and compute requirements. The maximum number of qubits you can actually simulate is therefore determined by the memory, CPU, and browser capabilities of the device you are using. We do not warrant or guarantee that any specific qubit count will run on any specific device. Descriptions such as "unlimited qubits" reflect the absence of a quota set by us, not a guarantee of achievable capacity on your hardware. • Luxo AI chat: Where Pro chat is described as "unlimited," this refers to the absence of a monthly message quota. We reserve the right to rate-limit, throttle, suspend, or otherwise restrict AI chat where usage (a) indicates automated, scripted, or non-human behaviour, (b) is substantially higher than typical individual use and creates disproportionate cost, (c) is used to resell, redistribute, scrape, or train other AI systems, or (d) violates our Acceptable Use policy. Reasonable individual interactive use by a single human user is not affected. • Other "unlimited" descriptions (including, without limitation, design export, preset downloads, or any feature lacking a stated numerical cap) are likewise subject to this fair-use principle. If we determine, in our reasonable discretion, that continued unrestricted access would materially harm the platform, other users, or our ability to operate the service sustainably, we may impose temporary limits, contact the account holder to discuss usage, or — in cases of clear abuse — suspend the account under the Termination section. Where possible, we will give notice before imposing limits on legitimate users.
5. Refunds & Cancellations
You may cancel your subscription at any time through the Stripe billing portal. Cancellation takes effect at the end of your current billing period and you retain full access until then. Billing details and invoices remain available through Stripe. Refund requests may be submitted within 14 days of an initial subscription purchase by contacting contact@quantumcircuitsimulator.com. After 14 days, refunds are issued at our discretion. Partial-month refunds are not provided for mid-cycle cancellations.
6. Intellectual Property
All original content on this platform — including quantum simulations, 3D cryostat models, interface designs, lesson text, and source code — is our proprietary intellectual property and is protected by copyright and other applicable laws. Scientific references, formulas, and citations remain the property of their respective authors and publishers. You may not reproduce, distribute, or create derivative works from our proprietary content without explicit written permission.
7. Acceptable Use
You agree not to: • Reverse-engineer, decompile, or attempt to extract the source code of the platform. • Scrape, crawl, or systematically download content from the platform. • Use the platform for any unlawful purpose or in violation of any applicable laws. • Attempt to interfere with, compromise, or disrupt the platform's infrastructure. • Resell, sublicense, or redistribute access to the platform or its content. • Misrepresent your identity or impersonate another user. • Use automated scripts, bots, or other tools to submit AI chat messages or otherwise circumvent the Service Limits and Fair Use section.
8. User Content
Any circuits, configurations, or presets you create on the platform remain yours. By saving content to the platform, you grant us a limited license to store and display it as part of the service. We will not use your content for purposes outside of providing the service without your consent.
9. Disclaimer of Warranties
The platform is provided "as is" and "as available" without warranties of any kind, whether express or implied, to the maximum extent permitted by applicable law. We do not guarantee that the platform will be uninterrupted, error-free, or free of harmful components. The simulations are educational tools and should not be relied upon for production quantum hardware design without independent verification. The circuit simulator's achievable qubit count, responsiveness, and stability depend on the computing resources of your device. Publicly stated qubit ceilings (including the Pro "unlimited" description) reflect the absence of a quota set by us, not a guarantee of runnable capacity on your hardware. You are responsible for assessing whether your device can support the workloads you attempt. The Luxo AI assistant relies on third-party large language model providers to generate responses. We do not warrant or guarantee the availability, latency, accuracy, completeness, or continuity of AI responses. Outputs may contain errors, omissions, or out-of-date information and should not be relied upon as professional, scientific, or legal advice. Temporary outages, response-quality issues, or changes imposed by the underlying provider are not grounds for refund or compensation. Nothing in this section excludes or limits liability that cannot be excluded or limited under applicable mandatory consumer protection law (including, where applicable, rights under EU consumer protection directives).
10. Limitation of Liability
To the maximum extent permitted by law, we shall not be liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of the platform, including but not limited to loss of data, revenue, or profits — even if we have been advised of the possibility of such damages. Our total liability for any claim arising from these terms shall not exceed the amount you paid us in the 12 months preceding the claim. Nothing in this section excludes or limits our liability for fraud, gross negligence, death or personal injury caused by our negligence, or any other liability that cannot be excluded under applicable mandatory law.
11. Termination
We may suspend or terminate your access to the platform at any time if you violate these terms, engage in abusive behavior, or for any reason with reasonable notice. You may request account deletion from your profile settings. If you still have an active paid subscription, you must first cancel it through the Stripe billing portal, and account deletion becomes available after the paid billing term has fully ended. Upon termination or completed account deletion, your right to use the platform ceases immediately and your personal data will be removed in accordance with our Privacy Policy. Provisions that by their nature should survive (such as intellectual property, limitation of liability, and dispute resolution) will remain in effect.
12. Governing Law
These terms are governed by and construed in accordance with applicable law. Any disputes arising from these terms or your use of the platform will be resolved through binding arbitration or in the courts of competent jurisdiction, as determined by the applicable governing law. Consumers resident in the European Union or the United Kingdom retain the benefit of any mandatory consumer protection rights granted by the law of their place of residence.
13. Changes to These Terms
We reserve the right to modify these terms at any time. Material changes will be communicated by updating the effective date on this page. Continued use of the platform after changes take effect constitutes your acceptance of the revised terms.
14. Contact
For questions about these terms, contact us at: contact@quantumcircuitsimulator.com