Duru Privacy Policy

Effective date: September 30, 2026

This Privacy Policy explains how YEONWOONG JUNG and Sehyun Kim (the joint operators of Duru, referred to as "we" or "us") handle personal information when you use Duru, a Korean learning app available on iOS and Android (the "App"). This policy applies to both versions of the App. It also covers our website at our Website.

1. Information we collect

We collect only what we need to run the App.

Account information

• When you sign in with Apple, we receive an identifier issued by Apple. We do not ask Apple for your name or email address.
• When you sign in with Google or Facebook, we receive an account identifier and the basic profile information that the provider shares by default, which may include your name, email address, and profile picture.
• When you sign in with a phone number (where offered), we receive your phone number to send you a one-time verification code by SMS.
• We create a user ID for your account and issue sign-in tokens.

Usage information

• We record how you use the App, such as which screens you open, which learning units you start, finish, or leave, and which settings you change. These records are linked to your user ID after you sign in.
• We do not collect your device model, operating system version, precise location, contacts, photos, or advertising identifier. Our analytics tool uses your IP address to estimate your country, state or region, and time zone, and then discards the IP address without storing it. We do not keep your city or any more precise location.

Voice and handwriting

• Speaking exercises use your microphone. Your speech is converted to text by Apple's speech recognition, on your device when your device supports it and otherwise by Apple's servers. We do not record, store, or receive your voice.
• Writing exercises recognize your handwriting on your device. We do not receive your drawings.

Information stored on your device

• Your sign-in tokens, the app language you chose, and usage records that could not be sent yet (until they are sent) are stored on your device.

Website visits

• When you visit the Website, we record which pages and sections you view and actions such as opening a question, switching language, or tapping a download button. We also record your device and browser type and the page that referred you.