Privacy Policy

We may collect the following information to provide, improve, and operate the Service.

The App may collect information such as the following to understand how the Service is used, improve its quality, and investigate bugs.

The brain age listed below is an indicator used within the App's games, calculated using the App's own methods, and is not a medical diagnosis.

We use PostHog, provided by PostHog, Inc., to analyze this information.

PostHog usage analytics is based on separate analytics consent, independent of advertising choices through Google UMP and Apple's ATT permission.

We do not intend to send names or email addresses to PostHog as user IDs for the purpose of directly identifying users.

However, multiple usage events and device information may be linked to an anonymous identifier. Using anonymous identifiers does not mean that no identifiers are collected.

The App uses RevenueCat, provided by RevenueCat, Inc., to offer paid features and other in-app purchases, verify and manage purchase status, enable ad removal, and restore purchases.

RevenueCat may process the following information.

Payments themselves are processed through the App Store payment system provided by Apple.

We do not directly collect or store users' credit card numbers or other payment card information.

The App uses Google AdMob, provided by Google LLC, to display advertisements.

The following description of advertising controls through UMP and ATT applies once the revised version of the App supporting Apple's tracking permission (the "ATT-enabled version") is released.

Google AdMob may collect or process, through the Google Mobile Ads SDK, IP addresses, approximate location inferred from IP addresses or similar information, device information, information about the operating system and App, advertising identifiers such as the IDFA, app- or developer-scoped device identifiers, information about ad impressions and interactions, ad delivery and advertising effectiveness measurement data, crash data, performance data, and similar information to display ads, manage ad delivery, prevent misuse, measure advertising effectiveness, and for similar purposes. The handling of advertising identifiers depends on factors such as ATT permission status.

In the ATT-enabled version, the App first verifies whether ad removal has been purchased. For users who have not purchased ad removal, advertising consent checks begin after onboarding is completed and the user reaches the Home screen. Users who have purchased ad removal are not shown ads or asked for unnecessary advertising consent or ATT permission.

Google's User Messaging Platform (UMP) is used to check users' consent and choices regarding advertising and related data in regions where this is required by law. UMP and Apple's App Tracking Transparency (ATT) are separate mechanisms.

Once the necessary advertising consent has been confirmed, the App checks ATT permission status on iOS and may request permission, for example if the user has not yet made a choice. ATT lets users allow or deny tracking across other companies' apps and websites for advertising purposes.

AdMob is initialized and ad requests are made only when both the necessary advertising consent and ATT permission are in place. Google's SDK may use the information listed above to deliver more relevant ads based on activity across other companies' apps and websites and to measure advertising effectiveness.

In the ATT-enabled version, new AdMob ad requests are stopped if ATT permission is denied or restricted, permission status cannot be confirmed, or the necessary advertising consent is missing. Users can still use the games and purchase features if they decline consent or permission. Stopping these ad requests does not mean that all communication with external services, including UMP consent checks, stops.

When users contact us through the contact form or by email, we may collect the following information that they enter or send.

Information collected through the contact form or by email is used to respond to inquiries, investigate bugs, and improve the Service.

We use Google Forms, provided by Google LLC, for the contact form.

We use Gmail, provided by Google LLC, to receive and respond to email inquiries.

Providing information through the contact form or by email is voluntary. However, we may be unable to provide an individual response if the information needed to reply is not provided.

We use the information we collect for the following purposes.

If we use collected information for a purpose that is not reasonably related to the purposes stated above, we will follow the procedures required by law.

The Service uses the following external services.

PostHog / Provider: PostHog, Inc. / Purposes: App usage analytics, quality improvement, and bug investigation

RevenueCat / Provider: RevenueCat, Inc. / Purposes: Managing in-app purchases, verifying purchase status, enabling ad removal, and restoring purchases

Google Forms / Provider: Google LLC / Purpose: Receiving inquiries

Gmail / Provider: Google LLC / Purpose: Receiving and responding to inquiries

Google AdMob / Provider: Google LLC / Purposes: Displaying ads, including more relevant ads, managing ad delivery, preventing misuse, and measuring advertising effectiveness

Google User Messaging Platform (UMP) / Provider: Google LLC / Purpose: Managing advertising and privacy consent and choices required by law

Apple App Store / Provider: Apple Inc. and its affiliates / Purposes: Distributing the App, in-app purchases, payments, and managing purchase information

Vercel / Provider: Vercel Inc. / Purpose: Hosting websites related to the Service

For information about how each service handles information, please refer to the privacy policies and other terms established by the respective providers.

We do not disclose collected personal information to third parties without the individual's consent, except in the following cases.

When we outsource information handling to external providers to the extent necessary to provide the Service, we select providers as necessary and appropriate and endeavor to ensure that information is handled appropriately.

We endeavor to retain collected information only for the period necessary to fulfill its respective purposes of use.

Once the purposes of use have been fulfilled and retention is no longer necessary under the law or for operating the Service, we will delete or anonymize the information within a reasonable period.

Information stored in PostHog, RevenueCat, Google, and other external services may be subject to the data retention policies established by the respective providers.

Users may request verification, correction, or deletion of user information held by us, to the extent permitted by law, through the Service's contact page.

However, we may be unable to identify the relevant data if it is managed solely using anonymous identifiers and we cannot verify its connection to a particular user.

In the ATT-enabled version, users can allow or deny tracking through Apple's system dialog on iOS. To change permission later, use the App's entry in iOS Settings under Privacy & Security > Tracking or the corresponding screen. Names and navigation paths may vary by OS version or other circumstances.

Google UMP may display an advertising consent form depending on the region. Where available, users can change their choices regarding advertising and related data through the advertising privacy option in the App's Settings screen. Availability depends on factors such as region, consent status, and whether ad removal has been purchased.

Users can choose or change their consent to PostHog usage analytics during onboarding or in the App's Settings screen. If consent is undecided, denied, or withdrawn, the App does not send new usage events or screen-view information to PostHog. The App does not collect events before consent for later backfilling. This analytics consent is independent of ATT permission and advertising choices through Google UMP.

In the ATT-enabled version, new AdMob ad requests are stopped when the necessary advertising consent or ATT permission cannot be confirmed. Games and purchase features remain available after consent or permission is denied or withdrawn.

Withdrawal of consent does not affect information handling that was lawfully carried out before the withdrawal. Withdrawal does not necessarily immediately stop or cancel all processing or communication already started by external services.

We endeavor to implement reasonable and appropriate security measures to prevent risks such as leakage, loss, damage, and unauthorized access to collected information.

Providers of external services used by the Service, or their servers, may be located outside Japan.

As a result, information collected through the Service may be stored or processed outside Japan.

We endeavor to take necessary measures in accordance with applicable law.

If minors provide names, email addresses, or other personal information through the contact form or similar means, they should obtain the consent of a parent, guardian, or other legal representative as necessary before doing so.

We may change this Policy in response to changes in the law, changes to the Service, or as otherwise necessary.

If we make significant changes, we will notify users by displaying a notice within the Service or by other reasonable means.

The revised Privacy Policy takes effect when it is posted on this page or on a separately specified effective date.

For inquiries about this Policy or the handling of user information, or requests for verification, correction, deletion, or similar actions, please contact us through the "Contact Us" page on this website.

Operator: Takuya Nemoto