Privacy Policy

Kifuku 起伏 · version 1.0 · last updated: 6 September 2026

Kifuku 起伏 teaches Japanese pitch accent — where the tone drops inside a word. All learning happens on your device, with no internet connection.

Your account

There isn't one. Kifuku never asks you to register, sign in or give an email address, and has no way of recognising you.

Where your learning data goes

Nowhere. Your mastery of each item, your answer history and your review schedule stay on your device and never leave it.

Shared progress with other apps

If you have my other Japanese-learning apps on the same device, Kifuku writes one small progress summary file to an area shared between those apps, so it can show you how the whole family is going. The file holds numbers, not personal data, and never leaves the device. Deleting the app deletes its entry.

Recordings and accent data

The app carries pronunciation recordings and accent data from open sources. They are embedded in the app file, so nothing is downloaded and nothing is streamed, and playing a recording sends no information anywhere. Authors and licences are credited inside the app, on the "Sources" screen.

Tracking and advertising

None. The app contains no analytics library, no advertising library, no crash reporting and no tracking identifier.

Purchases

The one-time purchase is handled entirely by Apple. Kifuku never sees your payment details — it only asks StoreKit whether the purchase exists.

Notifications

They are optional and only remind you about reviews. The app works fully without them and does not ask for permission on first launch.

Children

The app is rated 4+ and collects no data from anyone, at any age.

Changes

If this policy ever changes, the date at the top changes with it. This page's address carries the app version, so older releases always point at the document that actually described them.