개인정보 처리방침

LangYOU is designed with a privacy-first approach. Most of your data stays on your device. **Data stored on your device only:** - Your vocabulary (saved words and translations) - Imported books and reading progress - Learning statistics and exercise results - App preferences and settings - Spaced repetition schedules **Data we process on our servers:** - AI exercise evaluation requests (word, translation, sentence text — sent to our API at lang.hashlab.digital) - An anonymous device identifier for AI requests - Vocabulary sync data (if you use cloud sync features) - App interface translations for your selected language **Data processed by third-party services:** - Word translations via LibreTranslate and MyMemory APIs - Dictionary definitions via Free Dictionary API - Example sentences via Tatoeba API - Crash reports via Firebase Crashlytics (if enabled) - Subscription status via Apple StoreKit

LangYOU uses a hybrid AI approach: **On-device AI:** An AI language model (downloaded once, ~1.3GB) runs entirely on your iPhone to generate contextual example sentences. No data leaves your device for this feature. **Cloud AI:** For exercise evaluation, hints, and the AI tutor chat, text data (words, translations, sentences) is sent to our server at lang.hashlab.digital. An anonymous device identifier is included with these requests. No personal information such as name or email is sent.

프리미엄 구독은 Apple App Store를 통해 전적으로 관리됩니다. 결제 정보를 수집하거나 저장하지 않습니다. Apple이 자체 개인정보 처리방침에 따라 모든 결제, 영수증 및 구독 관리를 담당합니다.

LangYOU uses the following third-party services: - **Apple StoreKit** — for subscription management - **Firebase Crashlytics** — for anonymous crash reporting (can be disabled) - **Tatoeba** — for example sentences (open-source sentence database) - **LibreTranslate** — for word translations (open-source translation API) - **MyMemory** — as a fallback translation service - **Free Dictionary API** — for word definitions and phonetics These services receive only the minimum data needed to function (e.g., the word being translated). No personal identifiers are sent to third-party services.

We do not sell or share your personal data with third parties for advertising or marketing purposes. Data is only sent to the services listed above for core app functionality (translation, example sentences, AI exercises). Your vocabulary and reading data are never shared with advertisers or data brokers.

All learning data is stored locally on your device. Vocabulary sync data may be stored on our servers at lang.hashlab.digital if you use sync features. You can delete all app data at any time by removing the app or using the in-app reset function.

LangYOU는 13세 미만 아동의 개인정보를 의도적으로 수집하지 않습니다. 앱은 모든 연령에 적합하지만 특별히 아동을 대상으로 하지는 않습니다.

You have the right to: - Access all your data (it is on your device) - Delete all your data (via app deletion or in-app reset) - Opt out of crash reporting - Request information about data processing - Contact us at [email protected] for any privacy concerns

본 개인정보 처리방침을 수시로 업데이트할 수 있습니다. 변경 사항은 업데이트된 날짜와 함께 이 페이지에 게시됩니다.

본 개인정보 처리방침에 대한 문의는 [email protected]로 연락해 주세요.