QuadTalk Terms of Service

Amendment announced November 3, 2026 · effective November 10, 2026 (first effective October 18, 2026)

This is a translation. The Korean original is the official version; if the two differ, the Korean original prevails.

Article 1 (Purpose)

These Terms set out the rights, obligations and responsibilities of TerryWi (the "Provider") and users, and other necessary matters, regarding the use of the QuadTalk service (the "Service") provided by the Provider.

Article 2 (Definitions)

• "Service" means all features available through the mobile application "QuadTalk", including language learning (lessons, practice and review, bosses, bonuses, Word Book and Vocab Island, pronunciation guides), learning records and statistics, study reminders, and Google Drive backup and restore.
• "User" means anyone who installs and uses the Service. The Service can be used right after installation without registration; Google account connection applies only to users who want backup and restore.
• "Learning content" means the sentences, words, translations, pronunciation notations, grammar explanations and similar material included in the Service.

Article 3 (Posting and amendment)

1. The Provider posts these Terms in the Service or on a separate web page where users can easily find them.
2. The Provider may amend these Terms to the extent that applicable laws are not violated.
3. Amendments are announced in the Service or in this document at least 7 days before they take effect, or at least 30 days before by a clear method if they are unfavorable to users.

Article 4 (Formation of the agreement)

1. The agreement is formed, without any further step, when a user installs and launches the Service.
2. The Service asks for the year of birth on first launch. Google Drive backup and restore are available to users 14 and over once they complete Google account connection in the Service, and are not offered to users under 14 (Privacy Policy, Article 5-2).
3. Study reminders work only if the user turns them on and allows the notification permission.

Article 5 (Provision and changes of the Service)

1. The Provider offers the following features:
   • Lessons that teach three languages together, with one of Korean, English, Japanese and Chinese as the base language
   • Practice and review, bosses (level-up tests), bonuses, pronunciation guides
   • Listening to sentences through the device's text-to-speech, and speaking practice through the device's speech recognition
   • Study calendar, streak and statistics
   • Daily study reminder
   • Backup and restore of learning records through Google Drive
   • Word Book and Vocab Island (vocabulary learning)
   • Ads through Google AdMob (banner, interstitial and rewarded)
   • The paid subscription "QuadTalk Plus" (Article 6)
2. The Provider may add, change or discontinue features and learning content to improve the Service, and will announce significant changes in advance.
3. The Provider may temporarily suspend the Service for substantial operational reasons such as maintenance, replacement or failure of equipment, or communication outages.

Article 6 (Fees and paid subscription)

1. The learning features of the Service (lessons, practice and review, bosses, bonuses, Word Book and Vocab Island) are free to use.
2. Free users see the following ads through Google AdMob, which fund the Service:
   • Banner ads: at the bottom of tab screens
   • Interstitial ads: when leaving the result screen after every few stages, after passing a boss test, or after finishing practice
   • Rewarded ads: watched only when the user chooses, to retry a boss test right away
   No ads are shown during lessons, quizzes, boss tests or practice.
3. With the paid subscription "QuadTalk Plus" (the "Subscription"), banner and interstitial ads are not shown, and the user can retry a boss test right away without waiting after failing it. How learning progresses, such as collecting stars to open the next area, is the same with or without the Subscription.
4. The Subscription costs KRW 1,900 per month in Korea (VAT included); in other countries, the price shown on Google Play applies. Payment is made through the Google Play billing system, and the Provider does not receive payment details such as card numbers.
5. The Subscription renews and is charged automatically every month until the user cancels it. Where Google Play offers it to the account, a 7-day free trial is given on the first subscription; unless cancelled before the trial ends, the monthly fee is charged from the day the trial ends.
6. Users can cancel at any time with "Manage subscription" in Passport > QuadTalk Plus in the Service, or in Payments & subscriptions > Subscriptions in the Google Play app. After cancellation no further charges are made, and the benefits continue until the end of the period already paid for. Uninstalling the app does not cancel the Subscription.
7. Users may withdraw from the purchase within 7 days of payment under applicable laws such as Korea's Act on the Consumer Protection in Electronic Commerce; withdrawal may be limited as provided by law if the benefits have already been used. Refunds are handled through Google Play under its refund policy and procedures, and may also be requested from the Provider by email.
8. On the device of a user under 14 (Article 4), a parent check is required before the payment screen opens. If a minor pays without the consent of a legal guardian, the minor or the guardian may cancel the payment under applicable laws.
9. If the Provider changes the price or benefits of the Subscription, it will announce this in the Service beforehand; price increases are notified, and any required consent obtained, through Google Play's procedures.

Article 7 (Privacy)

The Provider complies with applicable laws and its separate Privacy Policy to protect users' personal information. See the Privacy Policy for the items collected, the on-device storage principle and how app permissions are used.

Article 8 (User obligations)

Users must not:

1. use another person's Google account information without authorization;
2. copy, disassemble, decompile, modify or distribute the Service's program, learning content, design or trademarks without the Provider's prior approval;
3. interfere with the operation of the Service, for example by spreading viruses or malware;
4. otherwise violate applicable laws or these Terms.

Article 9 (Disclaimer)

1. Learning content is a study aid. The Provider does not guarantee that translations, pronunciation notations or grammar explanations are accurate or natural in every situation. Please verify separately for important communication or official documents.
2. Study reminders rely on the scheduling features of the device's operating system. They may be delayed or not shown for reasons beyond the Provider's control, such as power-saving or battery optimization, the device being off, or changes in time or time zone.
3. Learning records are, as a rule, stored only on the user's device. The Service does not back up automatically; the user must tap "Back up now". Only the 3 most recent backups are kept in Google Drive, and records made after the last backup are not included. If the user loses, replaces or resets the device or uninstalls the app without a backup, records may not be recoverable, and the Provider is not responsible for this.
4. The Provider is not responsible when it cannot provide the Service due to force majeure such as natural disasters, war or interruption of telecommunication services.
5. Unless applicable laws provide otherwise, the Provider is not liable in connection with the use of a Service provided free of charge.

Article 10 (Termination and disconnection)

1. Users can disconnect their Google account at any time with "Sign out" in Passport > Account · Backup. Drive backups and learning records on the device remain after signing out.
2. "Disconnect account and delete backups" in Passport > Account · Backup disconnects the account, immediately deletes all backups stored in Google Drive, and revokes the Drive permission given to the app.
3. Users may stop using the Service at any time by uninstalling the app, which also deletes the learning records stored on the device.

Article 11 (Governing law and jurisdiction)

1. All disputes relating to these Terms are governed by the laws of the Republic of Korea.
2. Lawsuits over disputes arising from the use of the Service shall be filed with the court having jurisdiction under applicable laws.
3. The Korean text of these Terms is the original; English, Japanese and Simplified Chinese translations are published for convenience. If a translation differs from the original, the Korean original prevails.

Supplementary provisions

Provider: TerryWi
Contact: wwwtaekyu@gmail.com
First announced and effective: October 18, 2026
Amendment announced: November 3, 2026 · effective: November 10, 2026 (Articles 5 and 6 — paid subscription, interstitial and rewarded ads, Word Book and Vocab Island)

Contact: wwwtaekyu@gmail.com