Last updated: 16 September 2026
Kanji Kaku has no accounts and never asks for your name, email, or contacts. Your worksheets stay on your iPad. The app talks to the network for three things: the optional one-time "Pro" purchase, banner advertising in the free version, and anonymous diagnostics. The one piece of data that privacy law may treat as personal is your device's advertising identifier, which the ad network can use only if you allow tracking when iPadOS asks (see Advertising below).
If you buy Kanji Kaku Pro, the purchase is processed by Apple and verified through RevenueCat, which stores your purchase history under an anonymous, randomly generated identifier so the purchase can be restored on your other iPads. This is used only to unlock the features you paid for; it is not linked to your identity and is not used for tracking or advertising.
The free version shows a banner ad at the bottom of the screen, served by Google AdMob. Ads are restricted to general-audience content. To serve and measure ads, Google may collect your device's advertising identifier, coarse location derived from your IP address, information about the ads shown and how you interact with them, and crash and performance diagnostics. On first launch iOS asks whether Kanji Kaku may track you across other apps and websites (App Tracking Transparency); if you decline, ads are still shown but are not personalized. In the EEA and UK you are also asked for consent under GDPR, and you can change that choice at any time from the consent message. See how Google uses data in ads. Buying Kanji Kaku Pro removes advertising entirely.
Worksheets you create or mark as practiced are saved locally on your iPad using Apple's on-device storage. This data never leaves your device. It is protected by iOS data protection (encrypted at rest while the device is locked) and is excluded from device backups. Deleting the app removes this data.
Ink you draw while practicing is held only in memory for the current session and is never saved or transmitted.
iPadOS collects anonymous performance diagnostics for every app — launch times, hang rate, memory use, and crash or hang reports. Kanji Kaku keeps its recent reports on your iPad and may send them to a server we operate so we can find and fix problems. These reports contain technical details about the app and your iPad model and OS version; they contain no account, no identifier tied to you, and nothing you have written or practiced. The "Send feedback" button on the Credits screen prefills an email with the same app and device facts so you can see exactly what is shared.
Kanji Kaku includes two third-party SDKs: RevenueCat, used solely to process and restore the Pro purchase (see RevenueCat's privacy policy), and Google Mobile Ads with Google's User Messaging Platform, used to show banner ads and collect advertising consent in the free version (see Google's privacy policy). We use no analytics framework of our own. Dictionary, stroke-order, and JLPT-level data are bundled inside the app and are not fetched from any server.
The app is suitable for all ages and is not directed at children. Ads in the free version are limited to general-audience content. Apart from ads, the app contains no external links beyond the data-source attributions on the Credits screen.
Questions about this policy? Email support.