LinguaLume · Last updated: August 28, 2026
These Terms of Service ("Terms") govern your access to and use of LinguaLume — the mobile app, the web app at app.lingualume.com, the public reading pages at app.lingualume.com/s/…, and related services (together, the "Service"), operated by Winden Enterprise LLC, a Florida limited liability company, doing business as LinguaLume ("LinguaLume," "we," "us," or "our"). By creating an account, subscribing, or otherwise using the Service, you agree to these Terms.
If you do not agree, do not use the Service.
LinguaLume helps you learn German (and, in the future, other languages) by reading stories written at your level. The Service includes:
Features, pricing, and the specific limits described in this document may change; we'll update the "Last updated" date when they do (§12).
Some features are available without an account (for example, reading a public manuscript page). To start the free reading window, generate stories, or subscribe, you need an account — created with an email sign-in code or, where available, Google Sign-In.
If you started using the Service before creating an account, signing up lets you attach that activity to your account so it carries across devices going forward. We are not able to guarantee recovery of local data created before an account existed if it was never synced — see the Privacy Policy for how local vs. account-linked data works.
You're responsible for keeping your account credentials secure and for activity that happens under your account. Tell us right away at support@lingualume.com if you suspect unauthorized access.
You must be at least 13 years old to create an account. See the Privacy Policy for our children's-privacy stance and the Community Guidelines for the Community's separate posting-age rule.
New accounts get a limited free window to try the Service — a set amount of reading time and a set number of story generations, plus underlying technical limits we use to keep the Service running reliably for everyone. The free window does not renew or refill once used. We may adjust the size of the free window at any time; the amount in effect at the time you sign up is the amount that applies to you unless we say otherwise.
When your free window ends, continuing requires starting a subscription trial. The trial requires a valid payment method on file. The current trial length — currently five (5) days — and price are shown to you before you start the trial and again at checkout. Unless you cancel before the trial ends, it automatically converts into a paid subscription at the price shown at checkout, and you will be charged.
We will attempt to remind you before you're charged (by email and/or platform notification) — see the paywall screen for what's promised at the time you start a trial. This reminder is a courtesy, not a substitute for canceling in time if you don't want to be charged; you're responsible for canceling before the trial ends if that's what you want.
Subscription plans (currently monthly and annual) and their prices are shown to you at checkout before you pay and may vary by country, currency, platform, and promotions. Once a paid subscription starts, it automatically renews at the then-current price for the plan you chose until you cancel. We will give you reasonable advance notice of any price increase to an existing subscription, as required by law and by the platform you subscribed through.
A price change ordinarily takes effect at a future renewal. It never applies retroactively to a billing period you have already paid for. Where the law where you live, or the platform you subscribed through, requires your consent to a price change, we will follow that process. If you do not want to pay a new price, you can cancel before the renewal it would first apply to, and you keep your current price through the period you already paid for.
You can cancel anytime; cancellation takes effect at the end of the current billing period (you keep access through the period you already paid for, platform rules permitting). We don't offer prorated refunds for the unused part of a billing period except where the platform's own policy requires it, or where required by law in your jurisdiction.
You can request a refund within 14 days of a payment. The 14 days run from the date the payment is taken, and the window applies to every charge on your subscription: the first charge after a trial converts, and each later renewal. Requests made more than 14 days after a payment are considered case by case and are not guaranteed. Approved refunds go back to the original payment method, normally within 14 days of approval.
Refund requests are handled through the platform you paid through: Paddle's refund process for web purchases (Paddle is the merchant of record and decides those requests under its own buyer terms), or Google Play's refund policy for Play purchases. We're glad to help point you to the right place at support@lingualume.com, but we don't independently process platform refunds.
Nothing in this section limits any statutory cancellation or withdrawal right you have where you live. Consumers in the EU, EEA, UK and Switzerland have a 14-day statutory right to withdraw from digital content and service contracts, and consumers in some other countries have their own rights; where the law gives you more than this section does, the law applies. Full details are in our Refund Policy.
Story generation, translation, and related AI features are provided under a generous, personal-use ceiling — meant to comfortably cover how an individual learner actually reads and writes, not to cap normal use. It is not meant to support:
If your usage is far outside ordinary personal use, we may throttle generation speed, temporarily reduce limits, ask you about it by email, or — for clear automated abuse — suspend the account, before ever cutting you off mid-story. We size this ceiling to be invisible to the overwhelming majority of real learners.
You retain all ownership rights in the stories, notes, and other content you create using the Service ("Your Content"). We don't claim ownership of Your Content.
To operate the Service, you grant LinguaLume a worldwide, non-exclusive, royalty-free license to host, store, reproduce, translate, and process Your Content solely to provide the features you use — for example, sending story text to our AI providers to generate or translate it, or storing it so it syncs across your devices.
Some features let you choose to make a story more visible to others:
app.lingualume.com/s/<slug>): when you generate a link-only public page for one of your own generated stories, you grant us the additional license needed to display that specific story, in full, to anyone with the link — including in link-preview cards shown by messaging apps and social platforms. Pages you create this way are not indexed by search engines and use an unguessable link. You can unshare a public page at any time; unsharing takes the page down immediately.These licenses last as long as the content stays published, and end when you unshare it, delete it, or delete your account — except for copies already delivered to another person before that point, or records we keep for moderation, legal, or safety purposes.
You're solely responsible for content you post, including having the right to post it. Don't paste text you don't own or don't have permission to share — including passages from books, articles, or other copyrighted works. You agree to indemnify us against claims arising from content you post in violation of this section, to the extent permitted by law.
Content you publish passes through automated screening before becoming visible to others, and may be reviewed by a person before or after publication. We may remove any published content, at any time, that we believe violates these Terms, our Content Moderation Policy, or applicable law.
You agree not to:
We may suspend or terminate access for violating this section (§8).
Stories, translations, and related text or audio in LinguaLume may be generated or assisted by AI systems (currently including DeepSeek and OpenAI). We add a "Written with AI" indicator to publicly shared pages so this is never a surprise.
The Service is built on third parties. Its features depend on AI model providers (currently including DeepSeek and OpenAI), hosting and infrastructure providers, speech and audio providers, payment providers, and app marketplaces. To keep the Service working when costs, vendor terms, or availability change, we may change or replace the AI models and providers behind any feature, adjust how requests are routed between models, and set or adjust reasonable rate limits, quotas, and the fair-use rules in §3.7. Where we replace a model or provider, we aim to provide functionally comparable results where reasonable. We do not guarantee that any particular AI model, vendor, output, response time, or integration will remain available.
The Service itself — its software, design, trademarks (including "LinguaLume" and its logo), and all content we author or generate that isn't Your Content — is owned by LinguaLume or our licensors and protected by intellectual property law. Except for the rights expressly granted to you here, we reserve all rights in the Service.
The Lingua Library includes public-domain literary works (for example, works by authors who died more than 70 years ago, consistent with German public-domain law, which is stricter than U.S. law and is the standard we apply). These works are not owned by us; our contribution is the presentation, translation aids, and level-adjustment tooling built around them.
You may stop using the Service and delete your account at any time (contact support@lingualume.com for account and data deletion — see the Privacy Policy). Canceling a subscription does not automatically delete your account or data.
We may suspend or terminate your access to the Service, or to specific features like the Community or public publishing, for violating these Terms — including a single severe violation or a pattern of lesser ones — or where we reasonably believe it's necessary to protect the Service, other users, or third parties. Where practical, we'll tell you why.
LinguaLume is a small, independent service built on the third-party AI systems and infrastructure described in §6. We may modify, replace, limit, suspend, or discontinue features, AI models, integrations, usage allowances, subscription plans, or the Service as a whole, for operational, technical, security, legal, economic, vendor-related, or business reasons. If we permanently discontinue the Service or a material paid feature, we will give reasonable advance notice where practicable (for example, an in-app notice or email). We may act immediately and without advance notice where that is necessary for security, legal compliance, abuse prevention, a vendor failure, or other circumstances outside our reasonable control. We do not promise that LinguaLume, any feature, or any particular AI model will remain available indefinitely.
If we permanently discontinue the paid Service, the following applies:
This section works alongside the ordinary refund window in §3.6 and the Refund Policy. It does not shorten that window, and the 14-day window does not cap what you may be owed if we stop delivering a period you paid for. It is also different from ordinary cancellation by you (§3.5), which takes effect at the end of the paid period. Nothing in this section limits any consumer right you have where you live that cannot be waived by contract.
If we announce a permanent shutdown of the Service, we will keep account access and the in-app data-export tool (Settings → Your data) available for a reasonable period stated in the announcement, so you can export the content you made. After that period, data may be deleted in line with the Privacy Policy, applicable law, and the announced shutdown schedule.
To the maximum extent permitted by law, the Service is provided "as is" and "as available," without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose, and non-infringement. We don't warrant that the Service will be uninterrupted, error-free, or that any particular learning outcome will result from using it.
The Service may be interrupted from time to time by maintenance, updates, errors, or outages at the third-party providers described in §6. We work to keep interruptions short. This section limits warranties; it does not mean we have no responsibility at all for delivering a paid subscription. What we owe you for a paid period we cannot deliver is described in §8.4, and your non-waivable consumer rights are unaffected.
To the maximum extent permitted by law: LinguaLume and its officers, employees, and service providers will not be liable for any indirect, incidental, special, consequential, or punitive damages, or for any loss of data, profits, or goodwill, arising from your use of the Service. Our total liability for any claim arising out of or relating to the Service will not exceed the greater of (a) the amount you paid us in the twelve months before the claim arose, or (b) fifty U.S. dollars (USD 50).
Some jurisdictions don't allow the exclusion or limitation of certain damages, so some of the above may not apply to you.
These Terms are governed by the laws of the State of Florida, without regard to conflict-of-laws principles, and without regard to the United Nations Convention on Contracts for the International Sale of Goods.
Please read this section carefully — it affects your legal rights.
You and LinguaLume agree that any dispute, claim, or controversy arising out of or relating to these Terms or the Service will be resolved by binding arbitration on an individual basis, rather than in court, except that (a) either party may bring an individual claim in small-claims court, and (b) either party may seek injunctive relief in court for infringement or misuse of intellectual property.
The arbitration will be administered by the American Arbitration Association ("AAA") under its Consumer Arbitration Rules. The arbitration will be conducted by videoconference or telephone unless both parties agree otherwise or the arbitrator determines an in-person hearing is required, in which case it will be held in the county where you reside or another mutually agreed location. Payment of filing and arbitrator fees will be governed by the AAA's rules.
Class-action waiver: you and LinguaLume each waive the right to participate in a class, collective, consolidated, or representative action. The arbitrator may award relief only to the individual party seeking it.
30-day opt-out: you may opt out of this arbitration agreement by emailing support@lingualume.com with the subject "Arbitration opt-out" within 30 days of first accepting these Terms, stating your account email and 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 remainder still applies; if the class-action waiver specifically is found unenforceable as to a particular claim, that claim (and only that claim) proceeds in court rather than arbitration. Any dispute not subject to arbitration will be brought exclusively in the state or federal courts located in Florida, and you consent to their jurisdiction.
We may update these Terms from time to time. Each version shows its "Last updated" date at the top; that is also the date the version takes effect unless we state a later effective date. If we make a material change, we'll make reasonable efforts to notify active users (for example, an in-app notice or email) before the change takes effect, and a material change does not apply retroactively to a billing period you already paid for. Continuing to use the Service after a change takes effect means you accept the updated Terms. Earlier versions are listed in the version history at the end of this page and remain available to read, so you can see what changed and when.
Questions about these Terms: support@lingualume.com