Terms of Service.

01Acceptance of these Terms

These Terms of Service (the “Terms”) are a legal agreement between you (“you”, “your”) and Build Understanding, Inc. (“Build Understanding”, “we”, “us”, “our”). By creating an account, clicking “I agree,” signing in with a third-party provider, or otherwise accessing or using our websites, applications, APIs, and related services (together, the “Service”), you agree to be bound by these Terms and by our Privacy Policy, which is incorporated by reference. If you do not agree, do not use the Service.

02Eligibility and accounts

You may use the Service only if you can form a binding contract with Build Understanding and are not barred from doing so under applicable law. The Service is designed for students age 13 and older. If you are between 13 and the age of majority where you live, you represent that your parent or legal guardian has reviewed and agreed to these Terms on your behalf. We do not knowingly collect personal information from children under 13.

You are responsible for everything that happens under your account. You must provide accurate information when you register, keep your credentials secure, and notify us promptly at support if you believe your account has been compromised. You may not create an account for anyone other than yourself without their explicit permission, and you may not share your account with other people.

03The Service and license to use it

Subject to these Terms, we grant you a personal, limited, non-exclusive, non-transferable, non-sublicensable, revocable license to access and use the Service for your own non-commercial educational use. All rights not expressly granted here are reserved by Build Understanding and our licensors.

We may change, suspend, or discontinue any part of the Service at any time, including course content, interactive builds, AI features, and pricing. We will give reasonable notice of material changes where practical.

04Subscriptions, billing, and refunds

Parts of the Service are available only to paid subscribers. If you start a paid subscription, you authorize us and our payment processor (currently Stripe, Inc.) to charge your payment method on a recurring basis for the plan you selected (monthly or annual) until you cancel. Prices, features, and included usage limits are described on the pricing page and may change prospectively; any changes to your existing subscription will take effect at your next renewal unless otherwise stated.

You may cancel at any time from your account settings. Cancellation stops future renewals; it does not generate a refund for the current billing period, and you will retain paid access until the end of the period you already paid for. Except where required by law, all fees are non-refundable. If you believe you were billed in error, contact us within 30 days of the charge and we will investigate in good faith.

If a payment fails and we cannot collect after reasonable retries, we may downgrade your account to the free tier or suspend access until the balance is paid.

05Acceptable use

You agree that you will not, and will not attempt to:

• Reverse engineer, decompile, copy, or extract source code from the Service, except to the extent that applicable law expressly permits it.
• Scrape, crawl, cache, or systematically download content from the Service, or use automated means to access it at a volume or rate that a human could not reasonably reproduce.
• Resell, sublicense, republish, or use the Service or its content (including notes, builds, problems, and AI outputs) to train a machine-learning model, build a competing product, or distribute derivative works without our prior written consent.
• Attempt to bypass paywalls, usage limits, authentication, rate limits, or any other technical restrictions.
• Upload or transmit content that is unlawful, infringing, defamatory, harassing, hateful, or that contains malware or exploits.
• Probe, scan, or test the vulnerability of the Service, or interfere with its operation, except under an approved security-research process.
• Use the AI features to generate content intended to harass, defraud, or deceive others, or to produce material that violates any third party's rights.
• Use the Service to submit academic work as your own in violation of your school's policies. You are responsible for your own academic integrity.

We may investigate suspected violations, remove content, and suspend or terminate accounts that we reasonably believe are in breach of these Terms, with or without notice.

06Your content and submissions

Some features let you submit content — for example, answers you write, work you upload for AI grading, messages to our team, or feedback (together, “User Content”). You retain all rights in your User Content. By submitting it, you grant Build Understanding a worldwide, royalty-free, non-exclusive license to host, store, copy, transmit, display, and process it solely to operate, secure, improve, and provide the Service to you.

You represent that you have all rights necessary to grant that license, and that your User Content does not violate these Terms or any third-party rights. We are not obligated to retain any User Content once your account is closed; see the Privacy Policy for details on retention.

07AI features and output

The Service includes features that use large language models and other machine-learning systems (the “AI Features”) — for example, Practice problem generation, Teach It, Prove It, and AI FRQ grading. Output from the AI Features (“AI Output”) is generated automatically and may be incorrect, incomplete, or misleading. Treat it as a study aid, not authoritative fact.

We do not guarantee that AI Output is accurate, appropriate, or suitable for any particular purpose. You are solely responsible for verifying AI Output before you rely on it — especially for grades, exams, or any high-stakes decision. We may impose per-user usage limits on the AI Features (for example, AI grading quotas) and may change those limits at any time. To the extent AI Output includes third-party rights, your rights in the output are only those granted by applicable law.

08Intellectual property

The Service, including its course content, notes, interactive builds, concept graphs, code, design, and branding, is owned by Build Understanding or our licensors and is protected by copyright, trademark, and other laws. Except for the limited license in Section 3, nothing in these Terms transfers any intellectual property to you.

If you believe content on the Service infringes your copyright, send a notice with the information required by 17 U.S.C. § 512(c) to our designated agent via the contact page. We will respond to valid notices and may remove content and terminate repeat infringers.

09Third-party services

The Service integrates with third parties — for example, Stripe for payments, Supabase for data storage, Anthropic for AI model inference, Resend for transactional email, and Google for optional sign-in. Your use of those services is governed by their terms, and Build Understanding is not responsible for their acts or omissions.

10Termination

You can stop using the Service at any time and delete your account from your account settings. We may suspend or terminate your access at any time if you materially breach these Terms, if we are required to do so by law, or if continuing to provide the Service is no longer commercially reasonable. On termination, your license to use the Service ends, but Sections that by their nature should survive (including 6, 8, 11, 12, 13, and 14) will survive.

11Disclaimer of warranties

The Service is provided “as is” and “as available,” without warranties of any kind, whether express, implied, or statutory, including implied warranties of merchantability, fitness for a particular purpose, title, and non-infringement. We do not warrant that the Service will be uninterrupted, secure, or error-free, that defects will be corrected, or that content or AI Output will be accurate or complete. Some jurisdictions do not allow the exclusion of certain warranties, in which case those exclusions apply to you only to the extent permitted.

12Limitation of liability

To the maximum extent permitted by law, Build Understanding and its officers, directors, employees, and agents will not be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for any loss of profits, revenues, data, or goodwill, arising out of or in connection with your use of the Service, even if we have been advised of the possibility of such damages.

Our total aggregate liability for any claim arising out of or relating to these Terms or the Service is limited to the greater of (a) the amounts you paid to Build Understanding in the twelve months preceding the event giving rise to the claim and (b) one hundred U.S. dollars (US$100).

13Indemnification

You agree to defend, indemnify, and hold harmless Build Understanding and its affiliates from any claim, demand, loss, liability, or expense (including reasonable attorneys' fees) arising out of or related to: (a) your use of the Service; (b) your User Content; (c) your violation of these Terms; or (d) your violation of any law or third-party right. We may assume exclusive defense and control of any matter subject to indemnification, and you agree to cooperate with that defense.

14Governing law and dispute resolution

These Terms are governed by the laws of the State of Delaware, United States, without regard to its conflict-of-laws rules. Any dispute, claim, or controversy arising out of or relating to these Terms or the Service will be resolved by binding individual arbitration administered by the American Arbitration Association under its Consumer Arbitration Rules, in the English language, seated in New Castle County, Delaware — except that either party may bring an individual action in small-claims court if eligible.

You and Build Understanding each waive the right to a trial by jury and the right to participate in a class action, class arbitration, or representative proceeding. If this class-action waiver is found unenforceable, the entire arbitration agreement in this Section is void and the dispute will be resolved in the state or federal courts located in New Castle County, Delaware, and the parties submit to the personal jurisdiction of those courts.

You may opt out of this arbitration agreement by sending a written notice of your decision to opt out via the contact page within 30 days of first accepting these Terms.

15Changes to these Terms

We may update these Terms from time to time. If a change is material we will give reasonable notice — for example, by email or by prompting you to re-accept on your next sign-in. Changes become effective on the “Effective” date shown at the top of the page, and your continued use of the Service after that date constitutes your acceptance of the updated Terms.

16Miscellaneous

These Terms and our Privacy Policy are the entire agreement between you and Build Understanding regarding the Service, and supersede any prior agreements. If any provision is held unenforceable, the remaining provisions will remain in effect. Our failure to enforce a right is not a waiver of that right. You may not assign these Terms without our written consent; we may assign them in connection with a merger, acquisition, or sale of assets. Notices to you may be provided by email or by posting in the Service; notices to us must be sent via the contact page.

Questions about these Terms? Reach us at our contact page.