Terms of Use

1. Introduction

1.1 Pocket Apps Studio Pte Ltd (Registered Office: 160 Robinson Road, #14-04 Singapore Business Federation Center, Singapore 068914; hereinafter referred to as the “Provider”) provides the mobile application “XueTang”, a language learning platform designed to support users in acquiring and retaining Chinese vocabulary, grammar, and cultural knowledge. The app incorporates an advanced Flexible Spaced Repetition System (FSRS) to improve memory retention and offers a gamified experience through interactive exercises, collectible cultural outfits, and reward-based learning mechanics.

1.2 The app is available to download free of charge from the Apple App Store.

1.3 The following Terms of Use govern the legal framework for the use of the XueTang application.

2. Scope of application

The app is intended exclusively for private, non-commercial use. Use of the app is only permitted for personal purposes. Any commercial use or provision of services to third parties using the app without the express consent of the Provider is prohibited.

3. Use of the app, system requirements

3.1 To use the full functionality of the app — including saving progress, accessing exercises, and synchronizing personal learning data — the user must register an account. Registration is possible via email/password or third-party login providers (Apple or Google). Certain limited features may be accessible without registration.

3.2 To use the app, the user requires a compatible mobile device with an active internet connection. The user is responsible for ensuring that their device meets the technical requirements prior to installation.

3.3 The user must follow any usage notices and instructions provided within the app, including safety guidelines and operating recommendations. Failure to comply with such instructions may result in limited functionality or user disadvantages.

3.4 If technical issues, errors, or inconsistencies occur while using the app, the user should inform the Provider without undue delay. Upon request, the user shall assist the Provider in diagnosing the issue by describing the problem and, if needed, providing additional context.

3.5 The user agrees to install any software updates made available by the Provider, provided such updates do not fundamentally alter the nature or core content of the app. Updates will be announced when available and installed once the user connects to the internet.

4. Functionality

The scope of the app’s functions depends on whether the user uses the app in the free version (see Section 5) or has subscribed to the premium version (see Section 6). While the free version provides access to core learning features, such as vocabulary exercises and limited grammar content, the premium version unlocks additional functions — including advanced grammar levels, unlimited custom vocabulary, exclusive cultural content (e.g. collectible outfits), offline access, and other enhanced features — for the agreed subscription period.

5. Free version of the app

The free version of the app provides access to the core language learning experience. Users can:

Learn and review Chinese vocabulary from all levels of the HSK (1–6)
Complete a selection of vocabulary exercises (e.g. character recognition, pronunciation, and listening)
Access AI-generated grammar exercises for HSK levels 1–2
Add up to three custom vocabulary entries per day
Participate in daily learning sessions and earn reward coins
Unlock basic progress tracking via the integrated spaced repetition system (FSRS)

Some advanced features, content, and tools are restricted to users with a premium subscription.

6. Premium subscription

6.1 The user has the option to activate premium features by subscribing to the app. A premium subscription unlocks extended functionality beyond the free version, including:

Unlimited access to AI-generated grammar exercises for HSK levels 3–6
Unlimited custom vocabulary entries
Access to advanced features such as handwriting recognition, offline mode, and AI chat companion
Unlockable cultural outfits for the companion feature
Enhanced analytics and progress tracking
Increased coin rewards and multipliers

The specific premium features and their availability are presented clearly within the app.

6.2 The applicable prices for the premium subscription are displayed in the app. Payment is processed directly via the Apple App Store or the user’s linked payment method. Subscription terms, renewal conditions, and cancellation options are also managed via the App Store.

7. Scope of the rights of use and restrictions on use

7.1 The software on which the app and the various functions accessible via the app are based, as well as the content displayed in the app (including but not limited to vocabulary datasets, exercises, cultural illustrations, and companion elements), are protected by copyright. These copyrights are held by the Provider or its partners. The user is obligated to comply with applicable copyright laws. Any use beyond the ordinary operation of the app is prohibited. In particular, the user is not permitted to copy, distribute, or modify the software or its content for third parties.

7.2 The Provider grants the user a non-exclusive, non-transferable right to use the app solely for the purpose of learning Chinese language and culture. This right also includes access to features such as the personalized learning system, vocabulary exercises, companion elements, and software updates made available by the Provider.

7.3 The user may only reproduce, adapt, or decompile the software where explicitly permitted by law, specifically under Sections 69d and 69e of the German Copyright Act.

8. Warranty and liability

8.1 The Provider does not guarantee that the app will meet the individual expectations or specific learning outcomes of the user. The user is solely responsible for any content they contribute to the app, including custom vocabulary or personal input, and for the accuracy of that information.

8.2 The Provider and the user are liable for matters related to the use of the app in accordance with general statutory provisions, unless otherwise specified in the following clauses.

8.3 When using the free version of the app, the Provider is only liable for damages resulting from intentional or grossly negligent actions. Liability for slight negligence is excluded.

8.4 When using paid services, the Provider is fully liable for intent and gross negligence. In the event of slight negligence, liability is limited to cases where a duty is breached, the fulfillment of which is essential for achieving the contractual purpose (cardinal obligation). In such cases, liability is limited to typical, foreseeable damages. Any other liability for slight negligence is excluded.

8.5 The Provider shall not be liable for indirect damages or consequential damages, including lost data, lost learning progress, or lost rewards.

8.6 The above limitations of liability do not apply in cases of injury to life, limb, or health, nor in the event of claims under the German Product Liability Act (ProdHaftG) or the General Data Protection Regulation (GDPR). Liability for fraudulently concealed defects or for any express guarantees given by the Provider also remains unaffected. For clarity, the Provider does not offer any guarantees unless explicitly stated.

8.7 The user agrees to indemnify the Provider against all damages and third-party claims arising from the unlawful use of the app or from a culpable breach of these Terms of Use. This also includes the costs and expenses incurred in the course of defending such claims.

9. Renewal of the premium subscription, termination

9.1 If the paid subscription is not cancelled at least 24 hours before the end of the agreed minimum term, the subscription will be automatically renewed under the conditions stated at the time of purchase. The user has the right to cancel the subscription at any time with 24 hours’ notice prior to the end of the current billing period.

9.2 Cancellation must be carried out via the platform through which the subscription was purchased (e.g. Apple App Store). Deleting the app from the device does not constitute cancellation of the subscription.

9.3 The right of both parties to extraordinary termination for good cause remains unaffected.

9.4 Upon expiration or cancellation of the premium subscription, access to the premium features will be revoked. The user may continue to use the app with the free version, subject to the limitations outlined in Section 5.

10. Right of withdrawal

As a consumer, you have the following right of withdrawal when subscribing to the premium version of the app:

Instruction on the Right of Withdrawal

You have the right to withdraw from this contract within fourteen (14) days without giving any reason.

The withdrawal period is fourteen days from the date on which you or a third party named by you, who is not the carrier, took possession of the last goods or, in the case of digital services, from the date the contract was concluded.

To exercise your right of withdrawal, you must inform us (Moritz Tucher, Mühlenstraße 19, 33607 Bielefeld, Germany, Email: info@xuetang.app) of your decision to cancel this contract by means of a clear declaration (e.g. via letter, email).

To meet the withdrawal deadline, it is sufficient for you to send the notice of exercise of the right of withdrawal before the expiry of the withdrawal period.

Consequences of Withdrawal

If you withdraw from this contract, we shall reimburse all payments we have received from you, including delivery costs (except for additional costs arising from a delivery method other than the standard delivery offered by us), without undue delay and no later than fourteen days from the day on which we received notice of your withdrawal. For this repayment, we will use the same payment method you used for the original transaction unless expressly agreed otherwise. Under no circumstances will you be charged any fees for this repayment.

If you requested that services begin during the withdrawal period, you must pay us an appropriate amount corresponding to the proportion of the services already provided by the time you notify us of your withdrawal, relative to the total scope of the contract.

Expiration of the Right of Withdrawal

For digital content not delivered on a physical data carrier, your right of withdrawal expires if we have begun executing the contract after you have expressly consented to the immediate commencement of performance and have simultaneously acknowledged that you lose your right of withdrawal once performance has begun.

In the case of service contracts, the right of withdrawal also expires if the service has been fully performed and performance began only after you gave your express consent and acknowledged the consequences for your right of withdrawal.

11. Data protection

The protection of user data is of particular importance to the Provider. Detailed information regarding the collection, processing, and use of personal data can be found in the XueTang Privacy Policy, which is available within the app or online at the address provided.

12. Modifications and amendments

The Provider reserves the right to make unilateral changes to the app where necessary to safeguard legitimate interests, particularly to comply with legal obligations or to implement new features or improvements to the app.

13. Requests

All user inquiries or requests relating to the use of the app can be directed to the following address: info@xuetang.app

14. Platform for online dispute resolution

14.1 The European Commission provides a platform for online dispute resolution, which can be accessed at: https://ec.europa.eu/consumers/odr. This platform serves as a point of contact for the out-of-court resolution of disputes arising from online purchase or service contracts in which a consumer is involved.

14.2 The Provider is neither willing nor obliged to participate in dispute resolution proceedings before a consumer arbitration board.

15. Final provisions

15.1 The contract language is German. If these Terms of Use are made available in another language, the German version shall take precedence in the event of any discrepancies.

15.2 German law shall apply, to the exclusion of the United Nations Convention on Contracts for the International Sale of Goods (CISG). The application of mandatory consumer protection regulations in the country where the user has their habitual residence at the time of contract conclusion remains unaffected.

15.3 These Terms of Use are stored within the app and are also available for permanent download at: https://xuetang.app/terms-and-conditions/

15.4 If the user does not have a general place of jurisdiction within the Federal Republic of Germany, the place of jurisdiction shall be Bielefeld, Germany.

15.5 If any provision of these Terms of Use is or becomes invalid or unenforceable, the validity of the remaining provisions shall remain unaffected.