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Terms of Service

Last updated August 17, 2026

These terms cover your use of GradeCube, a browser extension and connected service operated by SturdyBridgeSystems LLC. When you set up GradeCube, we ask you to check a box to show that you agree to these terms and the Privacy Policy, and installing or using GradeCube also means you agree to them. If you do not agree, please do not use GradeCube.

What GradeCube is

GradeCube reads the course content you already have access to on your school platform and makes it readable by the AI assistant you already use (Claude or ChatGPT), so the assistant can answer questions about your classes. It also offers study features built from that content, such as study decks and a course dashboard. We grant you a personal, non transferable right to use GradeCube for your own studies.

A few definitions

To keep these terms clear: "GradeCube" means the GradeCube browser extension together with the connected service it talks to. "We," "us," and "our" mean SturdyBridgeSystems LLC, the company that builds and operates GradeCube. "You" means the person using GradeCube. "Added Content" means notes or files you choose to add to GradeCube yourself, including photos or scans of your own notes and any class memory text you save for your AI assistant. "Course content" means the material GradeCube reads from your school platform on your behalf. "AI assistant" means the third party AI you connect, currently Claude (Anthropic) or ChatGPT (OpenAI).

Who can use it

GradeCube is intended for enrolled college and university students. You must be at least 18 years old to use GradeCube, and by using it you confirm that you are. GradeCube is not directed to, and is not intended for, anyone under 18, and it is not a service for K-12 students or for K-12 coursework. If we learn that an account belongs to someone under 18, we will close it and delete its data. When you accept these terms in the product, we record that acceptance (which version of these terms, when, and your confirmation that you are 18 or older) so your agreement is provable, as the Privacy Policy describes. You may use GradeCube only with accounts and course content you are personally authorized to access. You must not use it on someone else's account, and you must not use it to access content you are not entitled to see. You are responsible for keeping your own login to your school platform and your AI assistant secure.

Use it honestly

GradeCube is a study tool, not a way to cheat, and that line is built into how the product works, not just the marketing:

You are responsible for following your school's and each course's academic integrity, AI, technology, and acceptable-use policies. Those policies vary by school, by course, and by assignment, and they govern. Using a study tool does not excuse a violation of them, and it is your responsibility to make sure your use of GradeCube is permitted under your school's technology and acceptable-use rules. GradeCube does not override your school's policies. If a course prohibits AI assistance on a given task, that rule is yours to follow. Even where a course limits AI, many of GradeCube's features do not use AI at all: the dashboard brings your own deadlines, calendar, grades, and course materials together in one place, which is useful no matter what your school's AI policy says.

Acceptable use

When you use GradeCube, you agree not to:

We may suspend or end access for anyone who does these things.

Content you add

If you add your own notes or files to GradeCube, you keep ownership of them, and you are responsible for what you add. You agree not to upload content that is illegal, that infringes someone else's rights, or that you do not have the right to share. We may remove content that violates these terms, and you can delete your own added content at any time. If you believe content in GradeCube infringes your rights, contact us at contact@sturdybridgesystems.com and we will review and act on it. We respond to valid notices under the Digital Millennium Copyright Act, and we end the access of users who repeatedly infringe.

So that GradeCube can actually work with what you add, you give SturdyBridgeSystems LLC a limited, non-exclusive, royalty-free permission to store, copy, display, and process your Added Content, and to send it to the AI assistant you connect, for the single purpose of operating GradeCube for you. This permission is not a transfer of ownership. It ends when you delete the content or your account, and we never use your Added Content for advertising or to train AI models.

Your course content works differently. You do not own most of it, so you are not giving us a licence to it. Instead, when you open a course, you are instructing us to read and process that course content on your behalf, in the same way your own browser does when you look at those pages. You confirm that you are entitled to access everything you have GradeCube read. You instruct us to keep it in your private space, to work with it so the study features can run, and to send the relevant parts to the AI assistant you connect when you ask it a question. We act on that instruction and for nothing else, and you can withdraw it at any time by deleting a course or asking us to delete your data.

If you send us feedback or suggestions about GradeCube, you allow us to use them to improve the product, with no obligation to you and without affecting your ownership of anything you shared.

Copyright complaints (DMCA)

If you believe material stored in a GradeCube account infringes a copyright you own or represent, you can send us a notice under the Digital Millennium Copyright Act. Our designated agent for those notices is:

Copyright Agent
SturdyBridgeSystems LLC
421 W Montgomery St, Apt 305C, Milledgeville, GA 31061
Phone: 478-227-0721
Email: contact@sturdybridgesystems.com
Registered with the United States Copyright Office, registration number DMCA-1075819.

Under 17 U.S.C. 512(c)(3), your notice needs to include all of the following. If something is missing we will try to reach you about it rather than simply ignoring the notice:

When we receive a valid notice, we remove or disable access to the material and let the student whose account held it know what happened.

If your content was removed and you believe that was a mistake, you can send a counter notice to the same agent under 17 U.S.C. 512(g). It needs your signature, identification of the material and where it was before removal, a statement under penalty of perjury that you believe in good faith it was removed by mistake or misidentification, and your name, address and telephone number together with your consent to the jurisdiction of the federal court for your address, or for any judicial district in which we may be found if you are outside the United States, and your agreement to accept service of process from the person who sent the original notice or from their agent.

If we receive a valid counter notice, we send a copy of it to the person who sent the original notice and tell them the material will go back. We put the material back between 10 and 14 business days after we receive your counter notice, unless the person who sent the original notice tells us first that they have gone to court to stop you using it.

Repeat infringers. We log every copyright notice we act on, together with the account it concerned and what we did, and we end the access of any user who infringes repeatedly.

Please send copyright notices only. Sending a notice you know to be false can make you liable for damages under 17 U.S.C. 512(f). For anything else, including a question about these terms, use the contact address at the end of this page.

Grades and deadlines are a convenience, not the official record

GradeCube reads your gradebook and your course calendar and does its best to present them accurately, including doing the grade math carefully so it never counts ungraded work as a zero. Even so, your school platform's gradebook and calendar remain the official source of truth. Always confirm anything that matters, like a real deadline or your actual standing in a class, against your school platform directly. GradeCube is provided as is, without warranties, and we do not guarantee that synced content is complete, current, or error free.

The AI's answers come from the AI, not from us

GradeCube gives the AI assistant you connect your course content, but the answers you see are generated by that assistant, Claude (Anthropic) or ChatGPT (OpenAI), not by GradeCube. AI assistants can be confidently wrong, misread a document, or miss something entirely. Treat their answers as a study aid, never as authoritative, and always verify anything that matters, like a grade, a deadline, or an exam date, against your school platform. SturdyBridgeSystems LLC is not responsible for the AI's answers or for any decision you make based on them. Your use of Claude or ChatGPT is also governed by that provider's own terms.

The same caution applies to changes you ask the assistant to make for you. You can tell it to add or move something on your calendar, hide an item you do not need, mark an assignment as turned in, pin an announcement, archive a class, or delete a study deck, and it will do it. It acts only on what you ask it to do, never on what a document or an announcement it read appears to suggest. It can still misunderstand you, so check that what it changed is what you meant, particularly before deleting a study deck, which cannot be undone. Nothing it does reaches your school platform, and marking something as turned in only records what you told us. Keeping track of your own deadlines and submissions remains your responsibility.

Availability and changes

GradeCube is under active development. New accounts start with a free trial and can then continue on a paid plan, as described under Your free trial and Paid plans below. We may add, change, or remove features, and we may pause or limit the service. School platforms also change on their own schedule, which can temporarily affect what GradeCube can read; when that happens we work to fix it.

Events outside our control

GradeCube depends on services we do not control, including your school platform, the AI assistant you connect, and the providers that host our service. We are not responsible for any delay, interruption, or failure caused by events beyond our reasonable control, such as changes or outages at your school platform, at an AI provider, or at a hosting or network provider, or other causes outside our control. When something like that affects GradeCube, we make reasonable efforts to restore it, but we do not guarantee a timeline.

Disclaimer of warranties

GRADECUBE IS PROVIDED "AS IS" AND "AS AVAILABLE," WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED. TO THE FULLEST EXTENT ALLOWED BY LAW, STURDYBRIDGESYSTEMS LLC DISCLAIMS ALL IMPLIED WARRANTIES, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT. We do not warrant that GradeCube will be uninterrupted, error free, completely secure, or that the content it shows is complete, current, or accurate. Anything you rely on from GradeCube is used at your own discretion and risk.

The Privacy Policy describes how we aim to handle and protect your data, including how we work to keep each student's data separate. Those descriptions are operational commitments about how we run the service, not warranties or guarantees, and nothing in the Privacy Policy is intended to expand our liability beyond this disclaimer and the limits set out in these terms.

Limitation of liability

To the fullest extent allowed by law, SturdyBridgeSystems LLC is not liable for indirect, incidental, or consequential damages arising from your use of GradeCube, including any academic outcome, missed deadline, or grade decision you make based on what GradeCube showed you. GradeCube is a study aid; the responsibility for your coursework and your compliance with your school's rules stays with you.

To the fullest extent permitted by law, the total aggregate liability of SturdyBridgeSystems LLC for all claims relating to GradeCube will not exceed the greater of (a) the amount you paid us for GradeCube in the 12 months before the claim, or (b) one hundred United States dollars. This limit applies even if a limited remedy fails of its essential purpose. Nothing in these terms limits liability that cannot be limited under Georgia law, including liability for our own fraud or willful misconduct.

Any claim relating to GradeCube must be filed within one year after it arises, to the extent Georgia law allows a shortened period; after that it is permanently barred.

If your use causes a claim

If your use of GradeCube, your breach of these terms, or content you add leads to a claim against SturdyBridgeSystems LLC by someone else, you agree to cover the reasonable costs that result, including legal fees, to the extent the law allows. This does not apply to anything caused by our own fault, and it does not apply to anyone under 18 who used GradeCube despite our age requirement.

Your free trial

Every new account starts with a free trial of 30 days. No credit card is required to start it, and you will never be charged automatically at the end of it. The 30 days begin when GradeCube first syncs one of your classes, not when you install the extension, so time spent before you actually start using it does not count against your trial.

We will tell you inside the product before your trial ends, and again when it ends. If you do nothing, nothing is taken from you automatically: your access continues until you choose a plan or until we pause the account, and we will have told you first either way.

People who used GradeCube for free during the early-access beta keep GradeCube free, with no trial to run out and nothing to pay. If you were using GradeCube before August 11, 2026, this applies to you.

Paid plans

When your free trial ends, you can choose any of these plans:

All prices are in United States dollars and do not include any tax that may apply where you live. The monthly and yearly plans renew automatically until you cancel them. You can cancel either at any time, and you keep access through the end of the period you already paid for. The semester plan is a single payment that ends on its own, so there is nothing to cancel.

When you choose a renewing plan, you are authorising the charge. You authorise us, through Stripe, to charge the payment method you give Stripe the amount shown above, on each renewal date, until you cancel. If a payment does not go through, Stripe tries again over the following days. If it still does not go through, your plan ends and your account may be paused as described below. We never add a fee for a failed payment.

If our prices change

We may change our prices. A change never affects a period you have already paid for. For a renewing plan, we will tell you at least 30 days before a new price applies to one of your renewals, both inside GradeCube and by email through Stripe, and that notice will tell you how to cancel. That gives you time to decide. If you do not want the new price, you can cancel before that renewal and keep your access through the end of the period you already paid for. Continuing your plan after the new price takes effect means you accept it. This paragraph is how price changes work, and it applies instead of the general rule under Changes to these terms.

How to cancel

You can cancel a renewing plan yourself, in a couple of clicks, without contacting us and without giving a reason. Open your GradeCube dashboard, go to Settings, and use Manage or cancel my subscription under Billing and payments. The same button is on your plans page. It opens a billing page run by Stripe where you can cancel, change your card, or download your receipts.

Cancelling stops the next payment. It does not cut off your access: you keep GradeCube through the end of the period you have already paid for, and nothing you have synced is deleted. If that page will not open for any reason, email us at contact@sturdybridgesystems.com and we will cancel it by hand, same day.

If GradeCube stops working for you and we cannot fix it in a reasonable time, contact us at contact@sturdybridgesystems.com and we will work out a fair refund. Beyond that, payments are generally not refundable, except where the law where you live says otherwise or where these terms say otherwise.

Payments are handled by Stripe, an outside payment processor. You give your email address and payment details to Stripe, not to us. We never see or store your full card details. Stripe handles that information under its own privacy policy and terms. Our Privacy Policy explains what we keep on our side, which is only an anonymous customer reference, never your card number and never your email.

What happens when a plan or trial ends

If your trial or plan ends and you do not add a new one, we may pause your account. While an account is paused, GradeCube stops answering through your AI assistant, your dashboard and your study decks stop opening, and the extension stops syncing new coursework.

Pausing an account does not delete anything. We do not remove your classes, materials, assignments, grades or study decks when we pause an account, and they all come back the moment you add a plan. We do not hold your data hostage in any other sense either: you can ask us to delete everything at any time, paused or not, and you can always get your coursework from your school platform, which stays the system of record. Even so, GradeCube is not a backup service, so keep your own copies of anything you cannot afford to lose.

Two honest limits. First, a paused account that stays unused is still subject to the ordinary retention timeline in the Privacy Policy, which clears out synced content from accounts unused for around 12 months. Second, we will always give you notice inside the product before pausing your account, but in-product notice only reaches you if you still have GradeCube installed.

Ending your use

You can stop using GradeCube at any time by removing the extension and deleting your data. We may suspend or end access for anyone who misuses the service or violates these terms.

If we end your access for a reason other than your breach of these terms, such as our retiring the service, we will make a reasonable effort to give you advance notice through the product so you can save or delete your data first, and if you are on a paid plan at that time we will refund the unused portion of what you paid (the part of your plan you had not yet used). When your use ends for any reason, your right to use GradeCube stops right away. What happens to your synced content is set out in the Privacy Policy under How long we keep it: we do not delete it the moment you stop, so that it is still there if you come back, and you can ask us to delete all of it at any time. The sections meant to outlast the agreement stay in effect.

Our rights in GradeCube

GradeCube, including its software, design, name, and logo, belongs to SturdyBridgeSystems LLC. These terms do not give you any ownership of it. You agree not to copy, resell, reverse engineer, or work around the limits, security, or protections built into GradeCube, except to the narrow extent the law specifically allows.

Data loss

GradeCube is not a backup service. Your school platform stays the system of record for your courses and grades. We are not responsible for any loss of synced content, and you should not rely on GradeCube as the only place your academic information exists.

How we reach you (notices)

Because GradeCube does not collect your email, our main way of reaching you is a clear notice posted inside the product. A notice of that kind is treated as received when you next open GradeCube, or fourteen days after we post it, whichever comes first. This covers notices about security, changes to these terms, and your account. If you choose to give us a contact method, such as a recovery email once that option exists, we will also use it for these notices. You can reach us any time at contact@sturdybridgesystems.com.

General

If any part of these terms is found unenforceable, the rest still applies. Our not enforcing a term right away is not a waiver of it. The sections meant to outlast the agreement, such as the disclaimers, the limitation of liability, the claim-coverage section, our ownership rights, the dispute-resolution and arbitration terms, and the governing-law section, survive after you stop using GradeCube. These terms, together with the Privacy Policy, are the entire agreement between you and SturdyBridgeSystems LLC about GradeCube, and they replace any earlier understanding. These terms govern your rights and obligations in using GradeCube, and the Privacy Policy governs how we handle your data; if the two ever conflict, the Privacy Policy controls on questions of data handling and these terms control on everything else, including all disclaimers and the limits of liability in these terms. You may not transfer your rights under these terms; we may transfer ours in connection with a change of the business.

Resolving disputes

If you have a dispute with us, we want to solve it quickly and fairly. First, please contact us at contact@sturdybridgesystems.com so we can try to resolve it informally. Most issues can be settled that way within 30 days.

If we cannot resolve it informally, you and SturdyBridgeSystems LLC agree that any dispute relating to GradeCube will be resolved by binding individual arbitration rather than in court, except that either of us may instead bring an individual claim in small claims court if it qualifies. The arbitration will be administered by the American Arbitration Association under its Consumer Arbitration Rules, which are published at adr.org. If the AAA will not administer it, you and we will agree on another established provider, and if we cannot agree, a court may appoint one. The arbitration will be held remotely, or in the county where you live if you ask for that. We will pay the arbitration provider's filing and administrative fees for any claim under $10,000, unless the arbitrator decides the claim was brought for an improper purpose. The Federal Arbitration Act governs this section. Any court proceeding to confirm or set aside an award will be brought in the state or federal courts located in Georgia.

You and SturdyBridgeSystems LLC agree to bring claims against each other only in an individual capacity, and not as a plaintiff or class member in any class, collective, or representative action. The arbitrator may not combine more than one person's claims or run any class proceeding.

You can opt out of this arbitration agreement by emailing contact@sturdybridgesystems.com within 30 days of first agreeing to these terms and saying that you opt out. Opting out does not affect any other part of these terms. If any part of this section is found unenforceable, the rest of this section still applies, except that the class-action waiver above is essential to it, so if that waiver is found unenforceable then this entire dispute-resolution section does not apply.

Governing law

These terms are governed by the laws of the State of Georgia, United States, without regard to its conflict of laws rules. For any dispute that is not subject to arbitration, you and SturdyBridgeSystems LLC agree to the exclusive jurisdiction and venue of the state and federal courts located in Georgia, and, to the extent the law allows, you and SturdyBridgeSystems LLC each give up the right to a jury trial. This section applies to these terms and to the Privacy Policy together.

Changes to these terms

If we update these terms, we will change the date at the top and call out meaningful changes through the product, as described in the Notices section. For minor changes, continuing to use GradeCube after the change means you accept the updated terms. For material changes, such as a change to the dispute-resolution terms or to how we handle your data, we will ask you to agree again before the change applies to you. Price changes work differently: they are covered by If our prices change under Paid plans, and that paragraph applies instead of this one.

Contact

Questions about these terms can go to contact@sturdybridgesystems.com.

GradeCube is operated by SturdyBridgeSystems LLC. Copyright notices are the one exception: those go to the designated agent named under Copyright complaints above, in the form described there.