Learn Languages with Retriever — Terms of Service

Article 1 (Purpose)

These Terms set out the conditions and procedures for using the Service and the rights, obligations and responsibilities of the Company and its members.

Article 2 (Definitions)

• Service — the personalised foreign-language learning content assembled from your taste picks, progress tracking and cross-device sync, the AI conversation tutor, read-aloud (TTS) and speaking practice, learning reminders, and everything else we provide through our website, mobile apps and the Apps in Toss mini-app.
• Member — a person who accepts these Terms and creates an account with an email address and password. On the web and in the iOS/Android apps the Service requires an account; visitors without one can view public pages only. The Apps in Toss mini-app is used without an account under Article 8-2.
• Mini-app user — a person who uses the Learn Languages with Retriever mini-app offered inside the Toss app through "Apps in Toss", without an account. Provisions of these Terms concerning members apply to mini-app users unless their nature makes that impossible.
• Account — the combination of the email address you register and the identifier we assign to it.
• Learning record — the XP, completed lessons, streak, taste picks, review schedule and other progress accumulated as you use the Service.
• AI output — anything produced by generative AI, including (i) sentences generated on the spot by the AI tutor, Today's Talk and pronunciation coaching in response to your input, (ii) speech synthesized by read-aloud (TTS), and (iii) lesson questions, options, explanations and context notes we prepared in advance.
• Paid service — any feature or item we offer for a fee, sold through in-app purchase in an app marketplace.

Article 3 (Posting and amendment of these Terms)

• We post these Terms, together with our trade name, representative, business registration number, address and contact details, where members can easily see them.
• We may amend these Terms within the limits of applicable law, including Korea's Act on the Regulation of Terms and Conditions, the E-Commerce Act and the Network Act.
• When we amend these Terms we state the changes, their effective date and the reason, and announce them in the Service or on this page at least 7 days before the effective date. Amendments unfavourable to members are announced at least 30 days in advance and also sent to the member's registered email address.
• If we have clearly stated that a member who does not object by the effective date is deemed to accept, and the member does not expressly object, the member is deemed to have accepted the amended Terms.
• If you do not accept an amendment we cannot apply it to you, and you may terminate the agreement by deleting your account.

Article 4 (Matters not covered)

Matters not covered by these Terms, and their interpretation, are governed by our Privacy Policy, the individual notices posted in the Service, and applicable law or commercial practice.

Article 5 (Formation of the agreement; age limit)

• The agreement is formed when a person who wishes to join accepts these Terms and the Privacy Policy, applies for membership, and we accept the application. For mini-app users the agreement is formed under Article 8-2.
• The Service is available only to people aged 14 or over. We do not accept applications from children under 14, and if we discover after registration that a member is under 14 we verify and delete the account and its personal data without delay.
• We may refuse an application, or later terminate the agreement, where: (i) another person's name or email address was used; (ii) the application contains false information; (iii) referral rewards or other benefits were sought by improper means; (iv) the application is for a purpose contrary to law or public order; or (v) we lack the capacity or face a technical obstacle.

Article 6 (Member information and account security)

• You can view and edit your information in Settings > Account. If registered details change you must update them or tell us; we are not liable for disadvantages arising from a failure to do so.
• You are responsible for your account and password, must not let a third party use them, and may not transfer, lend or sell your account.
• If you learn that your account or password has been stolen or is being used by a third party, tell us immediately and follow our guidance. We will then invalidate every session on that account and take any other necessary measures.

Article 7 (Notices to members)

We may notify you at your registered email address or by an in-app notification. For notices to members generally, posting in the Service for 7 days or more may replace individual notice; matters that materially affect your rights or obligations are always notified individually.

Article 8 (Provision and modification of the Service)

• We aim to provide the Service 24 hours a day, every day of the year.
• We may change learning content, features and screen layouts to improve quality. A material reduction or discontinuation of content or features is announced in advance under Article 3.
• Your learning record is stored with your account and follows you across devices. Signing out clears the progress left on that device.
• Features that depend on external providers — the AI tutor, server AI voice — may be limited temporarily by a provider's availability or by usage budgets. Where a fallback exists (for example your device's built-in voice) the feature remains usable through it.
• The AI tutor, Daily Talk and pronunciation coaching are available only if you consent, inside the app, to sharing data with our AI provider (Privacy Policy, section 10). Declining or later withdrawing consent in Settings locks only those features; lessons, review and listening practice remain fully available. Because this is your own choice, it is not a material reduction or discontinuation of the Service.

Article 8-2 (The Apps in Toss mini-app)

• Formation of the agreement — a mini-app user accepts these Terms and the Privacy Policy, and the agreement is formed, by opening the mini-app in the Toss app and using the Service. The age limit in Article 5 applies to mini-app users as well.
• Account and identification — the mini-app has no sign-up or sign-in; you are identified solely by the Toss anonymous key the Toss app issues. The key is not linked to any apochopo account, and we collect no account data such as an email address or name in the mini-app. Article 6 (account security) does not apply to mini-app users.
• Learning record — the mini-app's learning record is kept only in the mini-app storage inside the Toss app, not on our servers. Cross-device sync and recovery are therefore not provided, and removing the mini-app from the Toss app, or deleting the Toss app, deletes the learning record with it. We have no obligation to restore a record lost in this way.
• Free of charge — every feature of the mini-app is free, with no payments or advertising. Article 10 (paid services) does not apply to the mini-app; if we later introduce a paid service in the mini-app we will announce it in advance and amend these Terms under Article 3.
• Sound features — the mini-app has no device speech engine, so read-aloud and speaking practice are both provided by our server's AI voice and speech recognition, and the fallback in Article 8(4) (device built-in voice) is not available. Declining microphone permission skips only the speaking round; the rest of the lesson continues. Personal data handling is governed by section 10-2 of the Privacy Policy.
• Features not offered — the AI tutor, Daily Talk, pronunciation coaching and push notifications are not offered in the mini-app. We may add or remove features offered in the mini-app; withholding from the mini-app a feature that continues elsewhere is not a material reduction or discontinuation under Article 8(2).
• Ending use — a mini-app user may end use at any time by removing the mini-app from the Toss app, which takes the place of the deletion procedure in Article 14.
• Platform terms — use of the Toss app and the Apps in Toss platform itself is separately governed by the Toss operator's terms.

Article 9 (Suspension of the Service)

• We may suspend all or part of the Service for maintenance, replacement or breakdown of equipment, loss of connectivity or other substantial operational reasons. We give advance notice under Article 7, or notice as soon as possible afterwards where advance notice is impossible.
• We compensate members for loss caused by such a suspension, except where we prove that we acted without intent or negligence.

Article 10 (Paid services)

• As at the effective date of these Terms every learning feature is free and we charge members nothing. The paragraphs below apply from the date we introduce a paid service.
• The name, contents, price, term and any auto-renewal of a paid service are disclosed on the payment screen before payment, and payment proceeds only if you confirm and agree.
• Paid services are sold exclusively through in-app purchase in the app marketplace you use to access this app. Billing, refunds and cancellation of subscriptions are therefore handled under that marketplace's policies and procedures, and you can cancel or request a refund in your marketplace account settings.
• Under Article 17 of Korea's E-Commerce Act you may withdraw your subscription within 7 days of payment. Withdrawal may be restricted where the statutory exceptions apply — for example where digital content has already been used or was supplied immediately and its benefit consumed — and we disclose any such restriction before payment.
• If we fail to provide a paid service through our own fault we refund the amount paid as required by law.

Article 11 (Content rights, including AI output)

• Copyright and other intellectual property rights in the learning content (questions, explanations, context notes, illustrations, audio) and in the software belong to the Company or the rightful owner.
• You may use content obtained through the Service for your own personal study only, and may not reproduce, transmit, publish, distribute or broadcast it, allow a third party to use it, or use it commercially without our prior written consent.
• AI output — replies from the AI tutor are generated automatically and we do not warrant their accuracy, completeness or legality. We claim no copyright in AI output and you may use it freely for study. However, identical or similar output may be produced for other members, so you hold no exclusive right in it. If you use AI output outside the Service you do so at your own responsibility.
• Text you enter (including AI conversations) remains yours. We process it only as far as needed to generate replies and handle reports, and we never provide it as training data to any AI model.
• Names and images of real people or works that appear in learning content are used as citation for study purposes and do not imply any affiliation with or endorsement by the rights holders.

Article 11-2 (Notice and labelling of generative AI)

• We use generative AI in the following parts of the Service: (i) writing learning content — questions, options, explanations and context notes (reviewed by us before release); (ii) generating replies in the AI tutor, Today's Talk and pronunciation coaching; and (iii) synthesizing read-aloud (TTS) voices.
• Under Article 31(1) of the Korean Framework Act on the Development of Artificial Intelligence and Establishment of a Foundation for Trust, we give you this notice in the app the first time you use the Service, and we keep the same notice permanently available in Settings.
• Under Article 31(2) of the same Act we label output in the way that fits what it is. (i) Output generated in response to you, on the spot — the AI tutor, Today's Talk, calls and pronunciation coaching — carries an "AI-generated" label on the screen where it appears. (ii) Output we prepared in advance — lesson questions, options, explanations, context notes and read-aloud speech — is disclosed through the prior notice in (2) above and the permanent notice in Settings; the Enforcement Decree allows the Article 31(2) label to take any form a person or a machine can read, including in-UI display and an initial notice. (iii) Where output leaves the Service — for example a post on our social media — the fact is written into the output itself rather than relying on an in-app notice or label.
• This notice and labelling is separate from the prior consent to AI transmission in Article 10 of our Privacy Policy. Consent is about whether your sentences may be sent to an AI provider; this Article is about telling you that what you receive was made by AI. Labelling applies even if you decline consent — the conversation features are locked, but the lesson questions and context notes were still written by AI.
• AI output may contain inaccuracies. Our liability is limited as set out in Article 16.

Article 12 (Member obligations and prohibited conduct)

You must not do any of the following; doing so may lead to restrictions under Article 14.

• Registering false information, or using another person's information
• Stealing another member's account or password, or transferring, lending or selling an account
• Using automation (macros, bots) or other abnormal means to obtain progress, XP or rewards
• Obtaining or attempting to obtain referral rewards improperly, such as by creating multiple accounts or referring yourself
• Copying, scraping, redistributing or commercially exploiting the Service's content without permission
• Reverse engineering or decompiling the software, or reaching our API by means other than those we provide
• Using the AI tutor to attempt to generate content that insults, discriminates against or threatens others, or that is obscene or unlawful
• Infringing the intellectual property or reputation of the Company or a third party, or interfering with the stable operation of the Service
• Any other act contrary to applicable law or these Terms

Article 13 (Company obligations)

• We do not engage in conduct prohibited by law or these Terms, and we make our best efforts to provide the Service continuously and stably.
• We maintain security measures to protect members' personal data; the handling of personal data is governed by our Privacy Policy.
• We handle legitimate opinions and complaints through appropriate procedures, and where prompt handling is difficult we tell you the reason and the expected schedule.

Article 14 (Restrictions and termination)

• Where a member breaches Article 12 we may restrict use in escalating steps — warning, temporary suspension, permanent suspension — save that a serious or repeated breach may lead to immediate permanent suspension.
• When we restrict use we notify the member of the reason and the period, and the member may object within 14 days of that notice. If the objection is justified we restore access immediately.
• You may delete your account at any time in Settings > Account; the account and its learning record are deleted immediately. Deleted records cannot be restored, so check anything you need before deleting. Mini-app users end use by removing the mini-app from the Toss app, under Article 8-2.
• We may terminate the agreement, after prior notice, where a member has seriously breached these Terms.

Article 15 (Marketing messages)

Learning reminders (streak, review, goal and return-visit prompts) are part of providing the Service. Separately, promotional notifications such as milestone congratulations, weekly summaries and widget tips are sent only if you turn them on in Settings > Notifications, and we record the time of consent. You may withdraw consent at any time on the same screen, and no promotional notification is sent between 21:00 and 08:00.

Article 16 (Limitation of liability)

• The Service is a study aid and does not guarantee any particular learning outcome or test score.
• AI tutor replies and automatically generated study material may contain errors. You should treat them as reference material, and we do not warrant the accuracy of AI output — though we do review reported answers and take corrective action.
• We are not liable where we cannot provide the Service for reasons beyond our control, such as acts of God, war or national emergency, an outage at a telecommunications carrier, or a failure at an app marketplace or external AI provider.
• We are not liable for interruptions or loss attributable to a member's own fault, such as poor account or password management or a lost device.
• None of the above applies to loss caused by our intent or gross negligence, or in any other case where applicable law does not permit our liability to be limited.

Article 17 (Personal data)

We collect only the minimum personal data needed to provide the Service. Collection, use, processors, international transfers and how to exercise your rights are governed by our Privacy Policy.

Article 18 (Dispute resolution and jurisdiction)

• We operate a channel for member opinions and complaints: contact@apochopo.com
• Where a dispute arises, both parties will consult in good faith. If consultation fails, a member may apply for mediation to the Korea Consumer Agency or the Electronic Commerce Dispute Mediation Committee.
• These Terms and use of the Service are governed by the laws of the Republic of Korea.
• Litigation between the Company and a member is brought before the court having jurisdiction under Korea's Civil Procedure Act. Where a member's address or residence is unclear, or the member lives outside Korea, the Seoul Central District Court has jurisdiction.

Operator information

• Trade name: apochopo Inc. (주식회사 아포초포)
• Representative: 윤민정
• Business registration number: 178-86-04021
• Address: 서울특별시 강남구 개포로 264, 107동 902호 (개포동, 개포래미안포레스트)
• Contact: contact@apochopo.com

Addendum

These Terms take effect on 19 September 2026.