This is an English translation for convenience. If there is any difference, the Korean version prevails.
Privacy Policy
Effective date: October 18, 2026
Langer (the "App") processes only the minimum information needed for foreign-language (English and Korean) conversation practice. This policy has been prepared in accordance with the Personal Information Protection Act of the Republic of Korea.
1. Information we process
- Account information (Sign in with Apple): The unique user identifier and email address provided by Apple (a relay address if you use Apple's "Hide My Email"). We do not collect your name or phone number.
- Waitlist email: The email address you entered to join the beta waitlist on our website or in the App, and the time you signed up. We use it only to manage your place in line, send invite codes and announce the launch.
- Usage records: The time you last used the App (to manage beta spots), whether and when you gave consent, and an Apple-issued token used to disconnect Sign in with Apple when you delete your account.
- Voice and conversation content: The voice you record through the microphone and what you say are sent to the AI services listed in Sections 2 and 3 below to generate the AI conversation partner's replies and speaking feedback. The App's servers do not store your voice or conversation content.
- Usage counts: To apply the free usage limit and the fair-use limit, we keep daily usage counts for up to 48 hours.
- Subscription information: Payments are processed by Apple (App Store), and the App only checks whether you are subscribed. We do not receive your card details.
- Error logs: If a problem occurs in the App, technical information such as the type of problem and the time is recorded in server logs. These logs do not include what you said.
- Information stored on your device: Your conversation history and review notes are stored only on your device, not on our servers, and are deleted along with your account.
2. Entrusted processing
We entrust the following companies with parts of our service. They are all based in the United States, so the transfer details are also listed in Section 3.
- Apple Inc.: Sign-in and payment processing
- RevenueCat, Inc.: Subscription status checks
- Resend, Inc.: Sending invite code emails
3. Transfer of personal information overseas
To provide AI conversations, we transfer personal information overseas as described below. If you do not want this transfer, tap "Later" on the consent screen in the App; in that case, you will not be able to use the conversation feature.
| Recipient | Country | Items transferred | Timing and method | Purpose | Retention period |
|---|---|---|---|---|---|
| Google LLC (Gemini API) | United States | Voice, conversation content, lesson context | Encrypted transmission in real time during conversations | Generating the AI conversation partner's replies, speech synthesis, speaking feedback | Not retained after processing (under Google's API terms, not used to train models) |
| Cloudflare, Inc. | United States (global edge servers) | All information listed in Section 1 | Encrypted transmission when you use the App | Server operation, running auxiliary AI models (speech recognition and synthesis) | Same as the retention periods in Section 1 |
| RevenueCat, Inc. | United States | App account identifier (random ID), subscription status | Encrypted transmission when the subscription is checked | Checking subscription status | Until you delete your account |
| Resend, Inc. | United States | Email address, invite code | Encrypted transmission when an invite email is sent | Sending invite emails | Until the end of the provider's delivery log retention period |
4. Retention and deletion
We do not store voice or conversation content on our servers. Usage records are automatically deleted after at most 48 hours. Your account information is deleted immediately when you tap My Account → Delete Account in the App, together with the conversation history and review notes on that device, your waitlist information and the identifier used to check your subscription. If you do not use the App for 30 days, your beta spot passes to the next person on the waitlist (except for subscribers), but your account is kept until you request its deletion. Waitlist emails are deleted without delay after the official launch announcement or upon request.
5. Your rights
You may at any time request access to, correction or deletion of your personal information, or request that we stop processing it. Use the account deletion feature in the App or contact us at the address below, and we will handle your request without delay.
6. Security measures
All transmissions are encrypted with TLS. Login sessions are stored only as hashes and expire after one year. Voice and conversation content are not stored on our servers, and only the operator has access to them.
7. Children
The App is not intended for children under 14, and we confirm that you are 14 or older before your first conversation.
8. Privacy officer and contact
Privacy officer: Langer operator · contact@langer.school
9. Changes
If this policy changes, we will post a notice on this page, and if the changes are significant, we will ask for your consent again in the App.