Privacy Policy

Thai learning app “Thai Master”

Artwoo Co., Ltd. (株式会社アートウー) (the “Operator”) sets out below how user information is handled in the smartphone app “Thai Master” (iPhone and Android versions) (the “App”).

1. Information we collect

The App has no account registration of its own, and it does not ask for your name, email address, location, or contacts. The App contains no advertising or usage-analytics tools. For how information is handled when you buy the paid “Premium”, see “6. Premium purchases”; for when you log in as a member of the online Thai school “ThaiGo!”, see “7. ThaiGo! member login”.

2. Information stored only on your device

The following information is stored only on your device and is not sent anywhere, including to the Operator.

Learning records (words learned, review schedule, study streak, achievements, favorites, etc.)
Settings (type of pronunciation notation, reminder time, etc.)
Downloaded word audio files

Deleting the App also deletes this information.

3. Microphone

The App uses the microphone in pronunciation practice so you can compare your voice with the model audio. Recordings are used only on your device, for playback and for analyzing the pitch of your voice; they are not sent anywhere and are not saved outside the App. You can revoke microphone permission anytime in your device settings.

4. Notifications

Study reminders are notifications scheduled on your device. No information is sent anywhere for notifications.

5. Audio downloads and app updates

Word audio is downloaded as needed from Google Cloud Storage (a service of Google LLC). Due to how network communication works, connection information such as your IP address may be recorded on Google’s servers. This information is handled under Google’s privacy policy, and the Operator does not use it to identify you.

In addition, so that bugs and content errors can be fixed without going through the stores, the App checks with EAS Update (a service of 650 Industries, Inc. (Expo)) for new updates when it starts, and downloads any it finds. At that time, connection information such as your IP address, OS type, the App version and update identifier, and a random ID the App creates for each device are sent. If a serious error caused by an update occurred the last time the App was opened, details of that error are also sent. This information is sent only to deliver updates, is not linked to your name or email address, and is not used by the Operator to identify you.

6. Premium purchases

Premium purchases and checks on whether you have purchased use RevenueCat (a service of RevenueCat, Inc.). The following information is therefore sent to RevenueCat.

An anonymous ID the App creates for each device (not linked to your name or email address; if you log in as a ThaiGo! member, it is replaced by the link ID described in “7. ThaiGo! member login”)
Purchase history (plan purchased, purchase date, expiration date, App Store / Google Play purchase information)
Connection information such as device model, OS version, country or region, and language

This information is used only to process purchases, restore purchases, and check whether Premium is active. It is not used for advertising or to track you. Payment information (such as credit card numbers) is handled by Apple or Google; neither the Operator nor RevenueCat receives it. RevenueCat handles information under RevenueCat’s privacy policy.

7. ThaiGo! member login

Members of “ThaiGo!” (https://online-thaigo.com), an online Thai school for Japanese speakers run by the Operator, can use Premium as a member benefit. For this, they can log in as a ThaiGo! member from “ThaiGo! members” in the settings or the Premium screen (shown when the App is displayed in Japanese). Logging in is optional, and the App can be used without it.

The login screen is the ThaiGo! website opened in a browser inside the App. Your email address and password are entered on the ThaiGo! website and are never received by the App. After you log in, the App and ThaiGo! exchange the following information.

From the App to ThaiGo!: a one-time code and verification value used to confirm the login (authorization code with PKCE)
From ThaiGo! to the App: a random ID that ThaiGo! creates for each member (the “link ID”) and the expiration date of the member benefit. The App does not receive member information such as your name or email address
From the App to ThaiGo!: when the App starts without the member benefit, the link ID so that it can be granted again

After you log in, the App connects to RevenueCat with the link ID instead of the anonymous ID in “6. Premium purchases”, and your purchase status is tied to the link ID. The ThaiGo! server grants Premium to the link ID with an expiration date that matches your paid membership period (sending the link ID and expiration date to RevenueCat). On the ThaiGo! side, the link ID is tied to your member registration. While your ThaiGo! membership continues, the expiration date is extended; when it ends, the member benefit also ends.

This information is used only to confirm ThaiGo! membership and to grant the Premium member benefit. It is not used for advertising or to track you.

You can unlink anytime from the settings. When you unlink, the App goes back to the anonymous ID and the member benefit is no longer available (Premium you bought yourself can be restored with “Restore purchases”). If you leave ThaiGo!, the Premium member benefit is revoked. Member information on the ThaiGo! website is handled under the ThaiGo! privacy policy.

8. Backups

When you create a backup, the App puts your learning records into a single file and saves it to the location you choose (such as iCloud Drive, Google Drive, or the Files app on your device). You choose where it is saved, and the Operator does not receive its content.

9. Use by children

The App does not collect personal information such as names or email addresses, so it can be used safely at any age. Minors should get a parent’s or guardian’s consent before buying Premium.

10. Information sent to third parties

The App sends information to the following parties. The information sent is handled under each party’s privacy policy.

RevenueCat (managing Premium purchases)

Recipient: RevenueCat, Inc.

Information sent: An anonymous ID the App creates for each device (or, if you have logged in as a ThaiGo! member, the ThaiGo! link ID), purchase history (plan purchased, purchase date, expiration date, App Store / Google Play purchase information), and connection information such as device model, OS version, country or region, and language

Purpose: Processing purchases, restoring purchases, and checking whether Premium is active

ThaiGo! (ThaiGo! member login)

Recipient: Artwoo Co., Ltd. (株式会社アートウー) (the Operator)

Information sent: A one-time code and verification value used to confirm the login, the ThaiGo! link ID, and connection information such as your IP address

Purpose: Confirming ThaiGo! membership, and granting and renewing the Premium member benefit

App Store and Google Play billing

Recipient: Apple Inc. / Google LLC

Information sent: The plan being purchased and purchase information

Purpose: Payment for Premium purchases and checking free-trial eligibility

EAS Update (delivering app updates)

Recipient: 650 Industries, Inc. (Expo)

Information sent: A random ID the App creates for each device, connection information such as your IP address, OS type, the App version and update identifier, and, if a serious error caused by an update occurs, details of that error

Purpose: Checking for and downloading app updates

Google Cloud Storage (delivering word audio)

Recipient: Google LLC

Information sent: Connection information such as your IP address, and the audio files being downloaded

Purpose: Downloading word audio

11. Changes to this policy

The Operator may revise this policy as the App’s features change. Important changes will be announced on this page.

12. Contact

Artwoo Co., Ltd. (株式会社アートウー)
Email: support@artwoo.co.jp

Effective date: October 10, 2026 · Last updated: November 2, 2026