Legal

Privacy Policy

Established: June 1, 2026 Last updated: October 6, 2026

This is an English translation of the Japanese プライバシーポリシー. It is provided for your convenience. If there is any difference between the two, the Japanese version prevails.

AISolve, Inc. (“we,” “us,” or “our”) has established this Privacy Policy (“this Policy”) to explain how we handle your personal information in the websites, mobile applications, and other services we provide (collectively, the “Services”).

Article 1 (Scope)

This Policy applies to the handling of personal information in the Services. For handling that is specific to an individual application we provide (for example, “Hangul Builder”), please also review that application’s terms of use and any supplementary privacy provisions.

Article 2 (Information We Collect)

We may collect the following information when we provide the Services.

2.1 Information you provide to us directly

Your name and display name (nickname)
Email address
Sign-in provider information (the identifier, display name, and email address obtained through social sign-in such as Google or Apple)
Information you provide through contact forms and similar channels

2.2 Information collected automatically when you use the Services

Device information (OS, model, screen size, language setting)
App usage logs (launch and exit times, screen transitions, feature usage history)
Learning progress data (learning history, badges earned, streak days, etc.)
IP address, cookies, and similar data (an IP address may be used to estimate your approximate location, such as your country or region)
Crash reports and performance metrics

2.3 Information we do not hold

The following information is held directly by payment providers and is not stored on our servers:

Credit card numbers and other payment information
The original records of payment details, such as transaction IDs, receipts, and payment amounts

These are held by payment providers such as the Apple App Store, Google Play, and RevenueCat, under their own privacy policies.

Article 3 (How We Use Personal Information)

We use the personal information we collect for the following purposes:

To provide, operate, maintain, and improve the Services
To verify your identity, authenticate you, and manage your account
To save, restore, and sync your learning progress
To check your purchase status and grant access to purchased features
To respond to inquiries and provide support
To send you important notices (such as changes to terms, maintenance, and security notices)
To analyze how the Services are used and to create statistical data
To detect, prevent, and respond to fraudulent use
To respond to violations of laws or terms
To develop and introduce new services and features
For other purposes incidental to the purposes above

We do not provide your personal information to third parties except in any of the following cases:

With your consent
When required by law
When necessary to protect a person’s life, body, or property, and it is difficult to obtain your consent
When necessary to cooperate with a national or local government agency, or a party entrusted by one, in carrying out duties prescribed by law
In connection with a succession of business resulting from a merger, business transfer, or other reason

Article 5 (Service Providers and External Services)

We may entrust the handling of personal information to outside providers to the extent necessary to achieve the purposes of use. We contractually require these providers to take appropriate security measures.

The Services use the following external services. The handling of personal information in each service follows that provider’s privacy policy.

Service	Provider	Purpose
Firebase (Authentication, Firestore, Cloud Functions, Storage, Analytics, Crashlytics, Cloud Messaging, App Check)	Google LLC	Authentication, data storage, app features, usage analysis, crash analysis, push notifications, and verifying that the app and device are genuine
Google Play Integrity API	Google LLC	Verifying that the app and device are genuine through Firebase App Check (preventing fraudulent use)
Google Play Billing	Google LLC	In-app purchase payments
App Store In-App Purchase (StoreKit)	Apple Inc.	In-app purchase payments
App Attest / DeviceCheck	Apple Inc.	Verifying that the app and device are genuine through Firebase App Check (preventing fraudulent use)
RevenueCat	RevenueCat, Inc.	Managing and syncing purchase status
Sign in with Apple	Apple Inc.	Social sign-in
Google Sign-In	Google LLC	Social sign-in
Resend	Resend, Inc. (United States)	Sending transactional emails, such as for account deletion
Expo (Expo Application Services / Push)	Expo (United States)	Managing and delivering push notification tokens

Article 6 (International Transfers)

Some of the external services used in the Services process personal information on servers located in the United States and other countries. When transferring information abroad, we provide the necessary information about the personal information protection systems of the destination country and the security measures taken by the receiving provider.

Main destination country: United States (Firebase, RevenueCat, Resend, Expo, Apple)

Article 7 (How Long We Keep Personal Information)

We keep personal information only for as long as necessary to achieve the purposes of use, or for the period required by law.

Information linked to your account: for as long as the account exists
Information linked to an anonymous account (if you use the Services without registering an email address or similar): if the account is not used for 180 days after the last sign-in, we delete it automatically. There is no grace period and no advance notice for this automatic deletion. However, anonymous accounts with a purchase history for a paid plan are excluded from automatic deletion. If you want to keep using the Services or keep your data, please link your account (sign in with an email address or social sign-in)
After we receive an account deletion request: completely deleted after a 30-day grace period
Deletion audit logs: kept permanently in a form that cannot identify you (a one-way hash of the UID), to respond to fraud and legal disputes
Inquiry history: 3 years after the inquiry is closed
Records we are legally required to keep: for the period set by the applicable law

Article 8 (Security Measures)

We take the following measures to prevent leaks, loss, or damage of personal information and to otherwise keep it secure:

Encryption of communications (TLS)
Access control for databases and storage
Encrypted storage of credentials
Recording and monitoring of access logs
Training for employees and service providers

Article 9 (Your Rights)

You may exercise the following rights regarding your personal information:

Right to request disclosure: to request disclosure of the personal information we hold about you
Right to request correction, addition, or deletion: to request correction, addition, or deletion if your personal information is not accurate
Right to request suspension of use or erasure: to request that we stop using or erase your personal information if, for example, it is handled beyond what is necessary for the purposes of use
Right to request suspension of sharing with third parties: to request that we stop providing it to third parties
Data portability: the app provides a feature that lets you download your own learning data in JSON format (in the account settings screen)

To exercise these rights, please contact the inquiry desk listed in Article 13.

Article 10 (Account Deletion)

You can request deletion of your account for the Services at any time. The deletion procedure and the scope of deletion are set out for each application (for example, for “Hangul Builder,” please see the account deletion provisions in that app’s terms of use).

Important:

Data cannot be recovered after deletion is complete
Deleting your account does not automatically cancel a paid subscription. You need to cancel it separately in the App Store or Google Play
Payment-related data held by payment providers such as Apple, Google, and RevenueCat is not covered by our deletion
Deletion audit logs (in a form that cannot identify you) are kept permanently

Article 11 (Cookies and Similar Technologies)

Our websites and apps may use cookies, local storage, and similar technologies to provide the Services and to analyze how they are used. Our apps do not show ads, and we do not track you for advertising purposes or collect advertising identifiers (IDFA / GAID). Usage analysis is limited to first-party analysis for improving our own services. You can limit this collection through your browser or device settings. However, some features may no longer be available.

Article 12 (Personal Information of Minors)

The Services are not intended for children under 13. If you are under 13, please do not use the Services. If you are 13 or older but under 18, please use the Services with the consent of a parent or guardian.

If we learn that we have collected personal information from a child under 13, we will promptly delete it.

Article 13 (Contact)

For inquiries about this Policy or requests for disclosure of personal information, please contact:

Business name: AISolve, Inc.
Address: 3F R-Cube Aoyama, 1-3-1 Kita-Aoyama, Minato-ku, Tokyo 107-0061, Japan
Personal information protection manager: Jinchul Oh, President
Email: [email protected]

Article 14 (Changes to This Policy)

We may change this Policy due to changes in laws, changes to the Services, or other reasons. If we make important changes, we will notify you in the Services or by posting on our website. The revised Policy takes effect when it is posted in the Services.

Established: June 1, 2026 Last updated: October 6, 2026

AISolve, Inc.