LessonDot

Terms of Use

Effective date: 2026-11-15

These terms govern your use of the LessonDot app (the "app") provided by 타이디아(Tidia) ("we", "us").

1. Scope

  1. These terms set out the rights and obligations between you, the person using the app (usually an instructor running their own lessons), and us.
  2. The app is available as an Android app (distributed through Google Play) and as a web app (lessondot.app/app/). The same terms apply to both; differences are stated where they matter.
  3. Personal information is handled under our Privacy Policy. On personal information, the Privacy Policy prevails over these terms.
  4. Google Play, Google Drive and Google's ad services have their own terms and policies. We do not provide or guarantee those services.

2. The service

  1. The app helps instructors manage students, lesson programs, the lesson schedule, session passes and session usage, and expected and confirmed payments.
  2. Stored on your device. What you enter is stored on your device (app storage on Android, browser storage on the web). We run no server that stores it, and we never receive or see it.
  3. Optional backup. If you choose, the app stores a copy encrypted on your device in the app's own folder of your Google Drive account, so you can use the same records on several devices. You connect and disconnect the backup yourself. In this version, Google Drive is the only backup storage offered. Google provides the storage and the account; we do not control its capacity, availability or account actions.
  4. Exports and sharing. Saving payment records to a file, sharing a summary, opening your phone, messaging or email app, and importing students from a spreadsheet happen only when you start them. You choose where information goes; once sent, it is handled by the recipient.
  5. Ads. The app shows ads (Android: Google AdMob; web: Google AdSense). Ad requests never contain the business information you entered. Ad privacy and consent follow the Privacy Policy and the app's consent screens.
  6. Ad-free subscription. The Android app offers a paid subscription that removes ads (section 6). It applies only to the Android app; the web app shows ads whether or not you subscribe.
  7. We may change or discontinue features. We give notice of significant changes that are unfavorable to you as described in section 10.

3. Using the app

  1. The app is made for people who run lessons as their work and is not directed at children. If you are a minor where you live, use the app and buy the subscription only with your legal guardian's consent.
  2. There is no sign-up and no account. By installing the app or opening the web app and starting to use it, you agree to these terms.
  3. Use the app in line with the law and these terms, and do not use it to enter or send information that infringes other people's rights.
  4. Do not modify the app to get around the ads or the subscription check, or otherwise interfere with how it works. This does not limit any right the law gives you.

4. Information about other people that you enter

  1. You can enter other people's personal information in the app (names, phone numbers, email addresses, notes, lesson and payment records of students and guardians). Collecting, using, keeping and deleting it is something you do for your own business; we never receive it.
  2. Data protection laws that apply to you (for example the Korean Personal Information Protection Act or the EU GDPR) may make you responsible for handling it lawfully, for example:
    • telling students and guardians what you record and why, and getting consent where needed;
    • getting a parent's or guardian's consent before handling a child's information where the law requires it;
    • recording only what you need, and not writing sensitive information (such as health or religion) or national identification numbers in notes;
    • handling requests from students and guardians to view, correct or delete their information yourself (it is only on your devices and in your backup, so we cannot);
    • keeping your device secure, for example with a screen lock and by erasing the data after using a shared device.
  3. A contact recorded as a "guardian" in the app does not prove that the person is a legal representative.

5. Keeping your data and the risk of losing it

  1. We do not keep your business data, so we cannot recover it for you.
  2. Without a backup, your records exist only on that device. If you uninstall the app, clear the browser's data, or lose or break the device, the records cannot be recovered. Android app records are also excluded from the operating system's cloud backup and device transfer. While no backup is connected, the app shows this risk at the top of the screen.
  3. Even with a backup, you may be unable to recover records if:
    • you lose your Google account, it is suspended, or you delete the app's folder;
    • the records were entered after the last successful backup.
  4. Backups are recovered with the storage account: the recovery information is in the same backup folder, so anyone who can sign in to that storage account can open the backup. The app tells you this. Keeping your storage account secure is your responsibility.
  5. When records from several devices are merged and a conflict arises (for example remaining sessions below zero, or the same session deducted twice), the app marks it as a conflict for you to review. The app never deletes records to fix them; it adds an opposite record.
  6. You can keep separate copies of important records, for example with the export.

6. Ad-free subscription

  1. The ad-free subscription can be bought only in the Android app through Google Play billing and applies only to the Android app. The web app shows ads even if you subscribe.
  2. Your device checks the subscription directly with Google Play; the status is not sent to your backup or other devices. On another Android device using Google Play with the same Google account, use "Restore purchase" to check it again.
  3. Price, billing period (monthly or yearly), free trial, automatic renewal, cancellation and refunds are shown on the subscription screen and follow Google Play's payment terms and refund policy. The subscription renews automatically every billing period until you cancel and is charged to your Google Play payment method. You can cancel any time in Google Play under Payments & subscriptions → Subscriptions; after you cancel, no ads show until the paid period ends.
  4. The subscription only removes ads. Every feature of the app works the same without it.
  5. Nothing in these terms limits your legal rights to withdraw from a purchase or get a refund.
  6. If we offer a free trial, change the price or give a discount, we state the conditions on the subscription screen and in the store listing, and give notice as the law requires.

7. Intellectual property and license

  1. The rights to the app (code, design, trademarks) belong to us or their rightful owners. Open-source software in the app is subject to its own license.
  2. We grant you a non-exclusive, non-transferable license to use the app for personal and business purposes under these terms.
  3. The information you enter belongs to you. We never receive it and claim no right to use it.

8. Limitation of liability

  1. The app is provided as is. We do not warrant that it works without errors on every device and browser or that it fits a particular purpose. This does not exclude warranties that the law requires.
  2. To the extent the law allows, we are not liable for damage caused by the following, except damage caused by our intent or gross negligence:
    • losing data in the cases in section 5 (no backup connected, lost recovery means, storage account problems and similar);
    • you exposing your device or storage account to others;
    • outages, policy changes or account actions of third-party services such as Google, or device and browser makers;
    • the accuracy of information you enter, and business decisions you make based on it (such as charging fees or using session counts);
    • you handling other people's personal information in breach of the law (section 4).
  3. Remaining sessions, unpaid balances and other figures in the app are calculated from the records you enter. Your agreement with your students is the final basis for any contract or settlement.

9. Ending use

  1. You can stop using the app at any time. Erase the device data in Settings → Data on this device → Erase data on this device, or by uninstalling the app or clearing the site data in your browser. Backups in Google Drive are not deleted this way; delete them in Google Drive (see Support).
  2. Uninstalling the app does not cancel the ad-free subscription. Cancel it in Google Play.
  3. Since there are no accounts, we have no procedure to close your account.

10. Changes to these terms

  1. We may change these terms within the limits of the law.
  2. We announce the effective date and the changes on this page and in the app at least 7 days in advance, and at least 30 days in advance for changes that are unfavorable to you or significant.
  3. If you do not agree with the changed terms, you can stop using the app.

11. Governing law and disputes

  1. These terms are governed by the laws of the Republic of Korea.
  2. We will first try to resolve a dispute with you through the contact details in section 12. If that fails, it will be resolved by the court with jurisdiction under the Korean Civil Procedure Act.
  3. If you are a consumer and the law of the country where you live gives you mandatory protections or a court that is more favorable to you, those apply.

12. Contact

Operator타이디아(Tidia)
Representative방준환
Emailhello@tidia.app
SupportSupport page

We never receive your business data, so please do not send student information or recovery phrases when you contact us.

This English version and the Korean version are both official. If they differ, the Korean version applies to users in Korea and the English version to everyone else.