These Terms of Service ("Terms") are an agreement between you and Charmpi LLC, a Massachusetts limited liability company, which operates Lingocubes, with its principal place of business in Massachusetts ("Charmpi", "Lingocubes", "we", "us"). They govern your access to and use of lingocubes.com and any related services (the "Service").
By creating an account or otherwise using the Service, you accept these Terms. If you don't accept them, please don't use the Service.
If you are using the Service on behalf of an organization (a school, a tutoring company, a team), you confirm that you have authority to bind that organization to these Terms, and "you" includes that organization.
Lingocubes helps you author and practice with language-learning kits: cubes of vocabulary and sentences with audio, generated from your own source material (text you type, photos, PDFs, DOCX files) using AI. You can listen, practice shadowing, share kits with students you choose, and run classroom sessions.
The Service is a tool. We do not guarantee any specific learning outcome, fluency level, exam result, or career outcome.
You need an account to use most features. You agree to:
You are responsible for activity that happens under your account.
You agree not to:
If you see something on the Service that violates these rules, you can report it at hello@lingocubes.com.
Anything you create or upload — your kits, the source material you upload to generate them, your prompts to the AI, your notes — belongs to you. You keep all rights you had going in.
To run the Service for you, you grant us a worldwide, non-exclusive, royalty-free license to host, store, process, transmit, display, and create derivative works of your content only as necessary to provide the Service to you and to people you share with. For example: synthesizing audio from your text, generating kits from your uploads, displaying your shared kits to students you've invited. This license ends when you delete the content (or your account), except for backup copies that may persist for a limited window.
Output produced by AI in response to your input (your prompts, your uploads) is treated as your content — yours to use, edit, share, or delete. You are responsible for verifying its accuracy. AI outputs may contain errors in pronunciation, translation, grammar, or factual content; the Service is not a substitute for instruction by a qualified language teacher.
You confirm that the materials you upload (PDFs, photos, text) are either your own, in the public domain, used with permission, or used under fair use / fair dealing for your personal learning. Lingocubes does not grant you any new rights in third-party material.
The Service itself — the software, the brand, "Lingocubes", the logos, the design system, our internal prompts — belongs to us. These Terms do not give you rights in any of that beyond using the Service as intended.
You can share kits with specific users (e.g., your students) at the permission level you choose. When you share:
Future features (e.g., public kit gallery, paid kits) will, when introduced, be governed by these Terms plus any additional terms shown to you at the time you opt in.
The Service offers a Free plan with usage limits (described in-product, currently expressed as "sparks") and one or more Paid plans with higher or unlimited limits and additional features.
Paid plans are billed in advance, monthly or annually depending on the plan you choose, through Stripe. By subscribing, you also agree to Stripe's terms. Prices and billing cadence will be shown to you before you confirm.
Subscriptions renew automatically at the end of each billing period until you cancel. To cancel today, email hello@lingocubes.com; a self-serve cancel flow in your account settings is coming. Your plan remains active through the end of the current billing period.
We may change prices for future billing periods. We will notify you at least 30 days before a change takes effect. If you don't accept the new price, you can cancel before the change applies.
We offer a 14-day no-questions-asked refund on a new paid subscription. After that, payments are non-refundable except where required by law.
Where local law gives you a stronger right (e.g., EU consumer cooling-off), that law applies.
Prices may exclude applicable taxes (e.g., VAT, sales tax). Taxes are added at checkout where required.
Usage limits ("sparks") apply to AI generation and audio synthesis; they refill on the schedule shown in-product. These limits exist because each generation and each second of audio costs us money to run.
Sparks are not a stored balance with monetary value. We may adjust the quota included in any plan with reasonable notice. Sparks do not accumulate beyond the cap shown in-product.
We may rate-limit, throttle, or temporarily suspend AI generation for any user where we detect abuse, runaway loops, or activity that risks our provider relationships.
We work to keep the Service running smoothly, but we don't promise a specific uptime at the consumer tier. We may schedule maintenance, deploy changes, or experience outages caused by us or by upstream providers (AI vendors, audio vendors, hosting). We will try to communicate planned downtime where reasonable.
We may add, change, or remove features. We will try not to break workflows you rely on without notice.
You can stop using the Service or delete your account at any time. To delete your account today, email hello@lingocubes.com; an in-app delete-account flow is coming.
We may suspend or terminate your account if you materially violate these Terms (especially Section 4) or if we are required to by law. For non-egregious violations, we will normally contact you first to resolve the issue.
Your access ends (and any paid subscription is canceled), and your content is deleted on the schedule described in the Privacy Policy. Sections that by their nature should survive termination (e.g., ownership, disclaimers, liability limits, governing law) do so.
The Service is provided "as is" and "as available". To the maximum extent permitted by law, we disclaim all warranties, express or implied, including merchantability, fitness for a particular purpose, non-infringement, accuracy, and availability.
Specifically: We do not warrant that AI-generated content will be free of errors; that pronunciations or translations will be perfect; that the Service will be uninterrupted; or that any specific learning outcome will result from using the Service.
To the maximum extent permitted by law:
Some jurisdictions don't allow some of these limitations. In those places, our liability is limited to the smallest amount allowed.
If a third party brings a claim against us because of your content, your use of the Service in violation of these Terms, or your violation of any law or third-party right, you agree to indemnify and hold us harmless from that claim, including reasonable legal fees.
These Terms are governed by the laws of the Commonwealth of Massachusetts, USA, without regard to conflict-of-laws principles. The federal United Nations Convention on Contracts for the International Sale of Goods does not apply.
Any dispute that is not subject to the informal-resolution or arbitration process below will be brought exclusively in the state or federal courts located in Suffolk County, Massachusetts, and you and we consent to personal jurisdiction there. This does not override mandatory consumer-protection rules of your country or state of residence that cannot be waived by contract.
Before filing any claim, please contact hello@lingocubes.com and give us 60 days to try to resolve it with you. Most disputes can be resolved this way.
If we cannot resolve the dispute informally within 60 days, any remaining dispute will be resolved by binding individual arbitration administered by JAMS under its consumer rules, seated in Boston, Massachusetts. You and we waive the right to a jury trial and the right to participate in a class action, class arbitration, or representative action. You may opt out of this arbitration provision by emailing hello@lingocubes.com within 30 days of first accepting these Terms, in which case disputes will proceed in court as described under "Venue" above. This arbitration provision is governed by the Federal Arbitration Act.
Nothing in these Terms limits your rights under Massachusetts General Laws Chapter 93A or other non-waivable consumer-protection statutes.
We may update these Terms from time to time. When we make material changes, we will update the "Last updated" date and notify active users by email and/or in-app notice at least 30 days before the change takes effect. Continued use after the effective date means you accept the updated Terms. If you don't accept them, you can cancel and stop using the Service.
Questions: hello@lingocubes.com.