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Privacy Policy

KanjiKanji Modern is built privacy-first. Your learning data stays on your device. Handwriting recognition runs on-device. Shipped builds send no analytics or crash reports, and we do not sell personal data.

Last updated: July 2, 2026

This Privacy Policy describes how AI Persona, LLC ("we," "us," or "our") handles information in connection with KanjiKanji Modern (the "App").

The short version

The App's App Store privacy label is "Data Not Collected", and the shipped app matches it: current builds do not transmit your learning data, analytics events, or crash reports to us or to anyone else. The only information that ever leaves your device is feedback you choose to send us from inside the App, plus purchases handled by Apple.

Data that stays on your device

Learning progress

  • Which kanji you have studied, your SRS intervals, accuracy scores.
  • Study goals (daily targets, JLPT level focus, time preferences).
  • Achievements (badges earned, milestones).
  • Stored in a local database (Core Data) on your device. It is not uploaded to our servers, and current builds do not sync it via iCloud or any other cloud service.
  • Like any app data, it may be included in device backups you control (iCloud Backup or computer backups), which are governed by Apple's privacy terms.

Handwriting strokes

Handwriting recognition uses Apple's PencilKit and Google's ML Kit Digital Ink. Both run entirely on your device. Stroke data is evaluated locally and discarded — nothing is sent to a server, not analytics, not telemetry, not training data.

Data you can choose to send us

In-app feedback and bug reports

If you use the in-app feedback / bug report form, the App sends your report to our feedback endpoint so we can investigate it. This happens only when you tap send. A report contains:

  • The message you write (title, description, category).
  • Basic device context to help us reproduce the issue: device model, iOS version, App version and build number, language/locale, and screen size.

Reports are used only to triage, reproduce, and fix issues and to respond to you. The App has no accounts, so reports are not linked to an identity unless you include contact details in your message.

Purchase information (handled by Apple)

  • Subscription status and purchase dates, managed by Apple StoreKit.
  • We see whether you have Premium; we do not see your card.

What we do not collect

  • Usage analytics or telemetry events — none in shipped builds.
  • Crash reports — none in shipped builds.
  • Device identifiers (IDFA, IDFV) for tracking.
  • Location data.
  • Contacts.
  • Health data.
  • Your handwriting stroke data — it never leaves your phone.

Analytics and crash reporting: integrated but inactive

The App bundles third-party SDKs for product analytics (Mixpanel) and crash reporting (Sentry). In shipped builds these SDKs are disabled: no analytics token or crash-reporting endpoint is configured, the SDKs are never initialized, and no data is sent. If we ever activate them, we will update this policy and the App Store privacy label before any collection begins, and announce the change in the App.

Third-party services

Apple StoreKit

Handles all in-app purchases and subscriptions. Transaction data is managed by Apple per their Apple Privacy Policy.

Mixpanel (inactive)

Product-analytics SDK bundled with the App but disabled in shipped builds — it is not initialized and sends no data. Listed here for transparency. See Mixpanel Privacy Policy.

Sentry (inactive)

Crash-reporting SDK bundled with the App but disabled in shipped builds — it is not initialized and sends no data. Listed here for transparency. See Sentry Privacy Policy.

Your rights

Export your data

Settings → Export Data produces a JSON file containing your full learning history. Use it for backup or to transfer to a new device.

Delete your data

Settings → Reset All Data wipes local learning history. Uninstalling the App removes all local data from your device. To delete a feedback report you sent us, email us and we will remove it.

Access, correction, deletion (GDPR / CCPA)

If you reside in the EU, UK, or California (or any jurisdiction with equivalent rights), you can request access to, correction of, or deletion of personal data we hold about you. Email support@kanjikanji.app. We respond within 30 days. Because the App stores learning data only on your device, in most cases the only data we could hold about you is feedback you chose to send.

Children

The App is rated 4+ on the App Store. We do not knowingly collect personal information from children under 13 (or the applicable minimum age in your jurisdiction). If you believe a child has submitted personal data, contact us and we will delete it.

International transfers

Purchases are processed by Apple under Apple's own privacy commitments. Feedback you choose to send us is processed on our servers, which may be located in the United States. Shipped builds send no data to Mixpanel or Sentry; if those services are ever activated, transfers to their infrastructure would be covered by an updated version of this policy first.

Changes to this policy

We will update this policy when our data practices change. Material changes will be announced in the app and via the changelog.

Contact

Privacy questions? Contact AI Persona, LLC at support@kanjikanji.app. Postal address available on request.

See also: Terms of Service · Subscription Terms