Support
Kaitaku is built by one developer, and the developer reads the support inbox. Write to support@kaitaku.app.
Found a mistake in the Japanese? Please tell us, and include the word or sentence and what's wrong with it. Corrections are the most useful mail we get, and they get fixed in the next release.
Common questions
I bought the unlock and it's not showing up
Open Settings inside the app and tap Restore purchases. This asks the App Store to re-check your account, which is what's needed after reinstalling the app or moving to a new iPhone. Make sure you're signed in with the same Apple Account you bought it with. If it still doesn't appear, email us with the date of purchase and we'll sort it out.
How do I get a refund?
Refunds for App Store purchases are handled by Apple, not by us. Visit reportaproblem.apple.com, sign in, and choose the purchase. If Apple declines and you think that's wrong, email us and we'll do what we can.
How do I reset my progress?
There is no reset button in the app yet. To start over, delete the app and reinstall it. That removes everything on the device permanently, including your progress, which is not backed up to any server. Your purchase survives a delete and can be restored as above.
Can I move my progress to a new phone?
If you restore the new phone from an iPhone backup, your progress comes with it. Because there is no account or cloud sync, a fresh install on a new phone starts over. Your purchase, though, restores from the App Store.
My streak broke and I did study that day
Streaks roll over at midnight in your device's local time zone, so crossing time zones can shift a day. Kaitaku also gives free automatic grace days rather than charging to repair a streak. If something still looks wrong, email us.
The audio isn't playing
Check that your phone isn't in silent mode and that Speak on reveal is on in Settings inside the app. Kaitaku uses the Japanese voice installed on your iPhone; if speech sounds wrong or missing entirely, check that a Japanese voice is available under iOS Settings › Accessibility › Spoken Content › Voices.
Will there be an Android or web version?
Not currently. Kaitaku is an iPhone app built for iOS 17 and later.
Is my data private?
Yes. Nothing is collected at all. See the privacy policy.
Reporting a problem
When something is broken, the most useful email includes:
- what you did, and what happened instead of what you expected;
- the screen it happened on (a screenshot is ideal);
- your iPhone model and iOS version (iOS Settings › General › About).
Send it to support@kaitaku.app.
Where the Japanese comes from
Kaitaku's vocabulary and readings come from JMdict and KANJIDIC2, stroke order from KanjiVG, and example sentences from Tatoeba. All of it is openly licensed, and credited again under Acknowledgments in the app. If you spot an error, the report above is welcome.
- This app uses the JMdict and KANJIDIC2 dictionary files. These files are the property of the Electronic Dictionary Research and Development Group, and are used in conformance with the Group's licence.
- Stroke order data comes from KanjiVG, copyright Ulrich Apel, used under the Creative Commons Attribution-ShareAlike 3.0 licence.
- Example sentences come from Tatoeba, used under the Creative Commons Attribution 2.0 France licence.
- JLPT vocabulary lists come via open-anki-jlpt-decks (MIT licence, copyright Jamie Sinclair), built on the JLPT lists compiled by Jonathan Waller at tanos.co.uk, used under a Creative Commons Attribution licence.