Delete your data
Last updated November 4, 2026
This page explains how to delete the data of Crayon Study: Language (クレヨンスタディ：語学), the app by Takaki Takemura. There is no account: the data is tied to a random ID that the app makes for your phone.
How to delete your data
Way 1: in the app (right away)
- Open Menu › Settings.
- Tap Delete my data and confirm.
Our server deletes this phone's records at once, and the app gives itself a new random ID. Your learning records kept only on the phone can be erased there too, or by deleting the app.
Unused chat tickets are lost when you delete your data, and can't be given back.
Way 2: by email (within 30 days)
- Open Settings › About this app and note your support code.
- Write to [email protected] with the support code, asking us to delete your data.
We delete it within 30 days and reply to you when it is done.
What is deleted
- This phone's daily counts (questions, lessons, voices, dramas, ads for an extra question, reports).
- The coach's answers kept for this phone (the week's reviews, the day's check and speaking test, the list of test topics you have had).
- A plan given to this phone with a code.
- The chat tickets this phone bought and has left.
- With "Delete my data" in the app, or by deleting the app: what is kept only on your phone (goals, study records, words, chats, buddy, settings, age range).
What is kept, and for how long
| What | Linked to you? | Kept for |
|---|---|---|
| Daily counts of a phone | The phone's hashed ID (until deleted) | 3 days, then deleted automatically |
| The coach's answers | The phone's hashed ID and the language (until deleted) | 14 days (the week's review), 2 days (the day's check and test), 400 days (the list of topics) |
| Reports you sent about an AI answer | No (neither the ID nor the age range is kept) | 180 days |
| Shared answers to look-ups made without surrounding text, and AI voices | No (not linked to anyone) | 30 days; a lesson's voices as long as the lesson |
| Everyone's daily totals, and what the AI cost each day by language | No (no personal data) | 90 days (totals), 400 days (costs) |
| Crash reports (Sentry) | No (no personal data is sent) | 90 days |
| Server records (Google Cloud Logging: time, IP address, kind of request, never what you wrote) | Not to the ID | 30 days |
| What the AI (Anthropic's Claude) received to answer you | No (the ID is not sent to Anthropic) | Per Anthropic's policy, as in the Privacy Policy |
| Usage counts (TelemetryDeck) | No (anonymous) | As TelemetryDeck keeps them |
| Purchases of plans and chat tickets | Kept by Apple and Google, under their rules | As Apple and Google keep them |
A record of each chat-ticket purchase (the store's transaction number, the product and the date) may be kept without your ID, so that the same purchase is never credited twice. To cancel a plan, use your App Store or Google Play subscriptions; deleting your data does not cancel it.
See also the Privacy Policy and Support.