Terms of Service

These terms form a binding agreement between you and Odysseus English. Please read them before using the App.

1. Acceptance of these terms

These Terms of Service ("Terms") govern your access to and use of the Odysseus English mobile application and this website (together, the "Service"), operated by Odysseus English ("we", "us", "our").

By downloading, installing, creating an account, or otherwise using the Service, you agree to these Terms and to our Privacy Policy, which is incorporated here by reference. If you do not agree, do not use the Service.

2. Eligibility

You must be at least 13 years old to use the Service. If you are in the European Economic Area, you must be at least 16, or the minimum age set by your country's law if it is lower.

If you are under the age of majority where you live, you may use the Service only with the involvement and consent of a parent or legal guardian, who accepts these Terms on your behalf and is responsible for your use of the Service.

By using the Service you represent that you meet these requirements and that you are not barred from using it under any applicable law.

3. Your account

• You must provide accurate information when you register, and keep it up to date.
• You are responsible for keeping your credentials confidential and for all activity that occurs under your account.
• Notify us at studio.anhtuanit@gmail.com immediately if you suspect unauthorised access.
• One person, one account. Do not share your account, sell it, or transfer it to anyone else.
• You may delete your account at any time — see Deleting your account.

4. Licence to use the App

Subject to these Terms, we grant you a limited, personal, non-exclusive, non-transferable, non-sublicensable, revocable licence to download and use one copy of the App on a device you own or control, for your own personal, non-commercial learning.

This licence does not permit you to, and you agree not to:

• copy, modify, translate, or create derivative works of the App;
• reverse engineer, decompile, or disassemble the App, or attempt to derive its source code, except to the extent this restriction is prohibited by applicable law;
• rent, lease, lend, sell, sublicense, or otherwise distribute the App;
• remove or obscure any proprietary notice;
• use the App or its content to build a competing product, or to train a machine learning model, without our written permission.

5. Your content

You keep ownership of everything you create. Your answers, saved vocabulary lists, and the messages you write in the practice chat ("Your Content") remain yours.

To operate the Service, you grant us a worldwide, non-exclusive, royalty-free licence to host, store, reproduce, transmit, and display Your Content solely for the purposes of providing the Service to you — for example, saving your progress so it is there on your next device, or passing a chat message to the AI provider so it can generate a reply. This licence exists only so the Service can function; it ends when you delete Your Content or your account, subject to the backup timelines in our Privacy Policy.

We do not use Your Content to train machine learning models. Chat messages are passed to a third-party AI provider so it can answer you (section 7); what that provider does with the data it receives is governed by its own terms, which we do not control.

You represent that you own or have the necessary rights to Your Content, and that it does not infringe anyone else's rights or break any law.

We do not routinely monitor Your Content, but we may review and remove content that we reasonably believe violates these Terms or the law.

6. Acceptable use

You agree not to:

• use the Service for any unlawful purpose, or in breach of any applicable law or regulation;
• upload or transmit content that is unlawful, harassing, defamatory, hateful, obscene, or that depicts or promotes the sexual exploitation of children;
• infringe the intellectual property, privacy, or other rights of any person;
• upload malware, or otherwise interfere with the integrity or performance of the Service;
• attempt to gain unauthorised access to the Service, other accounts, or our systems;
• use bots, scrapers, or automated means to access the Service or extract its content at scale;
• circumvent any access restriction, rate limit, paywall, or security measure;
• impersonate any person or misrepresent your affiliation with anyone;
• resell or commercially exploit the Service or its content without our written permission.

7. The AI practice chat

The Service includes a chat where you practise English with an AI tutor. By using it you accept the following.

• Replies are machine-generated and may be wrong. The tutor is a language model. It suggests corrections to your sentences, and those suggestions are sometimes unnecessary, incomplete, or simply incorrect — it will at times "correct" a sentence that was already right. Do not rely on it as an authority on English, and do not rely on it for advice of any kind outside language practice.
• Your messages are sent to a third-party AI provider to generate the reply, and that provider retains the conversation on its own systems. We send the message text and an opaque conversation identifier, not your name, email address, or user ID. See the Privacy Policy.
• Do not enter sensitive information — passwords, financial or health details, or another person's personal data — into the chat.
• Do not misuse it. The chat is for practising English. Do not use it to generate unlawful, abusive, or infringing content, to attempt to extract its underlying instructions, or to relay another service's traffic through it.
• There is a usage limit. The number of messages you may send per hour is capped, because every message costs us money to answer. We may change the limit, and may suspend access to the chat for an account that abuses it without affecting the rest of the Service.
• The chat may be withdrawn. It depends on a third-party provider. If that provider becomes unavailable or uneconomic, we may change or discontinue the feature under section 11.

8. Purchases and subscriptions

The Service is currently free: it has no paid features, no subscriptions, and no advertising. This section applies only if we introduce paid features in future, and we would give notice in the App before doing so.

• All purchases are processed by the Apple App Store or Google Play, not by us. Their payment terms apply, and we never receive your payment card details.
• Prices are shown in the App before you confirm, and include taxes where the store is required to collect them.
• Subscriptions renew automatically for the same period at the then-current price unless you cancel at least 24 hours before the end of the current period. Manage and cancel subscriptions in your Apple ID or Google Play account settings — deleting the App does not cancel a subscription.
• Refunds are handled by the store under its own policy. We cannot issue refunds for store purchases directly, but contact us and we will help where we can.
• Consumers in the EEA, the UK, and other jurisdictions with statutory withdrawal or refund rights keep those rights in full; nothing here limits them.
• If we change subscription pricing, we will give you notice before the change applies to your renewal, and you may cancel before it takes effect.

9. Our intellectual property

The Service — including its software, lessons, exercises, text, audio, images, design, and the "Odysseus English" name and logo — is owned by us or our licensors and is protected by copyright, trademark, and other laws. Except for the limited licence in section 4, these Terms grant you no rights in it.

If you send us feedback, suggestions, or ideas, we may use them freely, without obligation or compensation to you.

10. Third-party services

The Service relies on third-party providers — Google Firebase for sign-in, a third-party AI provider for the practice chat (section 7), and cloud hosting, database, and storage providers — and may link to third-party websites. We are not responsible for third-party services or content, and their terms and privacy policies govern your use of them. The full list is in the Privacy Policy.

Speaking exercises use the speech recognition built into your device rather than a service of ours; on some Android versions that routes your audio through Google. We never receive the audio itself.

11. Availability and changes to the Service

We work to keep the Service available, but we do not guarantee uninterrupted access. We may modify, suspend, or discontinue any part of the Service at any time. Where we discontinue the Service or a material feature entirely, we will give reasonable advance notice where practicable, and, if you have paid for a period you will no longer receive, a pro-rata refund where required by law.

We may update these Terms. If a change is material, we will notify you in the App or by email at least 14 days before it takes effect. Continuing to use the Service after that date means you accept the updated Terms; if you do not agree, stop using the Service and delete your account.

12. Suspension and termination

You may stop using the Service and delete your account at any time.

We may suspend or terminate your access, with notice where reasonably practicable, if you materially breach these Terms, if your use creates a legal or security risk for us or other users, or if we are required to do so by law. For serious breaches — such as illegal content or attacks on the Service — we may act immediately and without prior notice.

On termination, your licence under section 4 ends. Sections 5 (as to licences already granted for content you have not deleted), 9, 13, 14, 15, 16, and 18 survive termination.

13. Disclaimers

The Service is provided "as is" and "as available". To the maximum extent permitted by law, we disclaim all warranties, express or implied, including implied warranties of merchantability, fitness for a particular purpose, non-infringement, and any warranty arising from course of dealing or usage of trade.

We do not warrant that the Service will be uninterrupted, error-free, or secure, that defects will be corrected, or that the content is accurate or complete. Odysseus English is a learning aid; we make no guarantee about any learning outcome, exam result, proficiency level, or certification.

Nothing in this section limits any warranty or right that cannot be excluded under the law that applies to you as a consumer.

14. Limitation of liability

To the maximum extent permitted by law:

• We are not liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for any loss of profits, revenue, data, goodwill, or business opportunity, however caused and under any theory of liability.
• Our total aggregate liability arising out of or relating to the Service is limited to the greater of (a) the total amount you paid us for the Service in the 12 months before the event giving rise to the claim, or (b) USD 50.

These limits do not apply to liability for death or personal injury caused by our negligence, for fraud or fraudulent misrepresentation, or to any other liability that cannot be excluded or limited under applicable law. If you are a consumer, you keep all mandatory rights granted to you by the law of your country of residence.

15. Indemnity

You agree to indemnify and hold us harmless from any claim, demand, loss, or expense (including reasonable legal fees) brought by a third party and arising out of Your Content, your use of the Service in breach of these Terms, or your violation of any law or of a third party's rights. This does not apply where the claim results from our own breach or negligence, and it does not apply to consumers to the extent such an obligation is unenforceable under local law.

16. Governing law and disputes

These Terms are governed by the laws of the Socialist Republic of Vietnam, without regard to its conflict-of-laws rules. The courts of Vietnam have jurisdiction over any dispute arising from these Terms or the Service.

If you are a consumer resident in the EEA, the UK, or another jurisdiction whose law grants you the right to bring proceedings in your local courts and to the protection of mandatory local consumer law, this section does not deprive you of those rights.

Before starting formal proceedings, please contact us at studio.anhtuanit@gmail.com — most issues can be resolved quickly and informally.

17. App store terms

If you obtained the App from the Apple App Store, you acknowledge that these Terms are between you and us, not Apple, and that Apple is not responsible for the App or its content. Apple has no obligation to provide maintenance or support. If the App fails to conform to any applicable warranty, you may notify Apple and Apple may refund the purchase price; to the maximum extent permitted by law, Apple has no other warranty obligation. Apple is not responsible for addressing any claim relating to the App, including product liability, regulatory non-compliance, or consumer protection claims, nor for third-party intellectual property claims. Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them against you.

If you obtained the App from Google Play, the Google Play Terms of Service also apply, and Google is not a party to these Terms and is not responsible for the App.

18. General

• Entire agreement. These Terms and the Privacy Policy are the entire agreement between you and us regarding the Service.
• Severability. If any provision is held unenforceable, the rest remains in force, and the unenforceable provision is applied to the maximum extent permitted.
• No waiver. Our failure to enforce a provision is not a waiver of it.
• Assignment. You may not assign these Terms without our consent. We may assign them in connection with a merger, acquisition, or sale of assets.
• Force majeure. Neither party is liable for delay or failure caused by events beyond its reasonable control.
• Language. These Terms are written in English. Any translation is provided for convenience; the English version prevails in the event of a conflict, except where local law requires otherwise.

19. Contact

Email: studio.anhtuanit@gmail.com