Terms of Service

1. Acceptance of These Terms

Welcome to Tukera, an AI-powered platform for learning Chinese. These Terms of Service ("Terms") form a legally binding agreement between you and Tukera ("we", "us", "our") governing your access to and use of the Tukera website, applications, and related services (collectively, the "Service").

By creating an account, accessing, or using the Service, you confirm that you have read, understood, and agree to be bound by these Terms and our Privacy Policy. If you do not agree, you must not use the Service. If you use the Service on behalf of an organization, you represent that you are authorized to bind that organization to these Terms.

2. Description of the Service

Tukera provides AI-assisted Chinese language learning features, including but not limited to AI conversation practice, adaptive exercises, dictation and listening practice, flashcards with spaced repetition, vocabulary tools, writing evaluation, text-to-speech audio, speech scoring, courses, and progress analytics.

Some features are free; others require a paid subscription or consume a usage quota. We may add, change, or discontinue features (or parts of them) at any time, with or without notice, as described in Section 16.

3. Accounts, Registration & Security

To use most features you must register an account with a valid email address and complete email verification. You must provide accurate information and keep it up to date.

You are responsible for maintaining the confidentiality of your login credentials and for all activity that occurs under your account. You must notify us promptly of any unauthorized use. We are not liable for losses caused by unauthorized use of your credentials where you failed to safeguard them.

You must be at least 13 years old (or the minimum age of digital consent in your jurisdiction) to create an account.

4. Subscriptions, Billing & Cancellation

Paid plans are billed in advance on a recurring basis (e.g., monthly or annually) through our payment processor, Creem. Prices, included quotas, and billing cycles are shown at checkout and on the billing page. Taxes may apply where required by law.

Subscriptions renew automatically until cancelled. You may cancel at any time on the billing page; cancellation takes effect at the end of the current billing period, and you retain access until then. We do not provide prorated refunds for partial periods except as described in our Refund Policy.

We may change prices or plan contents prospectively. We will give you reasonable advance notice of price changes affecting your existing subscription; continuing your subscription after the effective date constitutes acceptance.

• You authorize us and our payment processor to charge your chosen payment method for recurring fees.
• Failed or declined payments may result in suspension or downgrade of paid features.
• You are responsible for keeping your payment details current.

5. Free Tier, Trials & Usage Quotas

The Service includes a free tier with limited quotas. AI-powered features (such as conversation, exercise generation, writing evaluation, speech scoring, and text-to-speech) consume usage quotas that reset per billing period according to your plan.

We may offer free trials or promotional access at our discretion. Trial terms, including duration and automatic conversion to a paid plan, will be shown at the time of the offer.

Quotas are per account, non-transferable, and expire at the end of each billing period unless stated otherwise. Unused quota does not roll over.

6. Acceptable Use

You agree to use the Service only for lawful personal or organizational learning purposes. You must not:

• Upload, generate, or distribute content that is unlawful, harmful, abusive, hateful, harassing, defamatory, sexually explicit involving minors, or that incites violence or discrimination;
• Attempt to probe, scan, or test the vulnerability of the Service, breach security or authentication measures, or access data not intended for you;
• Reverse engineer, scrape, crawl, or bulk-extract content, vocabulary data, or AI outputs, except as permitted by law;
• Use the Service to develop a competing product, or to train or benchmark machine-learning models;
• Share your account, sell or resell access, or circumvent quotas, tier restrictions, or rate limits;
• Impersonate any person or misrepresent your affiliation;
• Interfere with or disrupt the Service or its infrastructure, including through automated abuse, bots, or denial-of-service activity.
• Infringe intellectual-property, privacy, or other rights of third parties.

7. AI-Generated Content & Accuracy Disclaimer

The Service uses large language models and speech technologies to generate exercises, explanations, translations, pinyin, example sentences, feedback, and audio. While we design these systems carefully, AI output can be inaccurate, incomplete, or inappropriate for a given context.

AI-generated learning content is provided for educational assistance only. It does not constitute professional linguistic, educational, legal, or other advice. You should verify important information — for example, before using generated content in formal, professional, or high-stakes settings.

Speech scoring and writing evaluation are automated assessments intended as learning aids. They are approximations of proficiency and are not official test scores or certifications.

8. Your Content & License to Us

You retain ownership of content you submit to the Service, such as text input, voice recordings, and practice answers ("User Content").

By submitting User Content, you grant us a worldwide, non-exclusive, royalty-free license to host, process, transmit, and display that content solely as needed to operate, improve, and secure the Service — for example, to transcribe and score your speech, generate personalized exercises, and display your history back to you.

You represent that you have the rights necessary to submit your User Content and that it does not violate these Terms or third-party rights. We may remove User Content that violates these Terms.

9. Intellectual Property

The Service, including its software, design, branding, course materials, and the compilations of AI-generated learning content we create, is owned by or licensed to Tukera and protected by intellectual-property laws.

Subject to your compliance with these Terms, we grant you a limited, non-exclusive, non-transferable, revocable license to access and use the Service for its intended learning purposes. All rights not expressly granted are reserved.

10. Third-Party Services

The Service relies on third-party providers — including cloud hosting, databases, storage, payment processing, speech synthesis and recognition, and AI model providers. Your use of features powered by third parties may be subject to those providers' terms.

We are not responsible for the availability, accuracy, or practices of third-party services, and links or integrations do not imply endorsement.

11. Disclaimers

The Service is provided "as is" and "as available", with all faults and without warranty of any kind. To the maximum extent permitted by law, we disclaim all warranties, express or implied, including merchantability, fitness for a particular purpose, non-infringement, and any warranty that the Service will be uninterrupted, error-free, or that learning outcomes will be achieved.

Language learning results vary by individual. We do not guarantee any particular proficiency level, exam result, or learning outcome.

12. Limitation of Liability

To the maximum extent permitted by applicable law, in no event will Tukera, its directors, employees, or affiliates be liable for any indirect, incidental, special, consequential, or punitive damages — including lost profits, lost data, or loss of goodwill — arising out of or related to your use of the Service.

Our aggregate liability for all claims relating to the Service is limited to the amount you paid us in the twelve (12) months preceding the claim, or one hundred US dollars (US$100) if you paid nothing. Some jurisdictions do not allow certain limitations; in that case our liability is limited to the greatest extent permitted.

13. Indemnification

You agree to indemnify and hold harmless Tukera and its personnel from any claims, losses, and expenses (including reasonable legal fees) arising out of your User Content, your violation of these Terms, or your violation of any law or third-party right.

14. Term & Termination

These Terms apply while you use the Service. You may stop using the Service and delete your account at any time in your account settings.

We may suspend or terminate your access immediately, without prior notice, if you breach these Terms, create risk or legal exposure for us or others, or if required by law. We may also suspend the Service entirely for maintenance or security reasons.

Upon termination, your right to use the Service ends. Sections that by their nature should survive (including intellectual property, disclaimers, limitation of liability, and governing law) survive termination.

15. Governing Law & Dispute Resolution

These Terms are governed by the laws of the jurisdiction in which Tukera is established, without regard to conflict-of-law principles. Any dispute arising from these Terms or the Service will be resolved in the courts of that jurisdiction, unless applicable consumer law gives you the right to bring claims elsewhere.

Nothing in these Terms limits any non-waivable consumer rights you may have under local law.

16. Changes to These Terms

We may update these Terms from time to time to reflect changes to the Service or legal requirements. We will post the updated version on this page and update the "Last Updated" date. For material changes, we will provide additional notice (for example, by email or in-app message) where required.

Your continued use of the Service after the effective date of updated Terms constitutes acceptance. If you do not agree, stop using the Service and delete your account.

17. Contact Us

If you have questions about these Terms, contact us at support@tukera.com or through the in-app feedback center.