This is an English translation provided for convenience. If there is any discrepancy between this translation and the Japanese version, the Japanese version prevails.
Privacy Policy
This policy describes how Talk Muscle (Japanese name: コミュ筋トレ; the "App") handles personal information.
Last updated: November 13, 2026
1. Basic Policy
The App does not collect any information that identifies you personally.
The App never asks you to enter your name, email address, phone number, address, or date of birth.
No account registration is required.
2. Information We Collect
| Information | Details | Purpose |
| Device identifier | A random string that the App automatically generates for each device | Managing usage (limits) and saving your practice records |
| Conversation content | Text you enter during practice, text transcribed from your voice, and replies you write in the message reply practice | Generating the partner's responses and creating feedback |
| Summaries for continuing a conversation | When you use "Continue the conversation," a few lines that AI writes from your previous conversation (such as plans and things you like; the AI is instructed not to include health, money, names, or similar details) | So the same partner can remember what you talked about |
| Speaking data | Length of your utterances, speaking speed, pauses, number of filler words, and voice impression scores | Creating feedback |
| Usage | Number of conversations, time spent using voice playback, and practice history | Managing limits and displaying your records |
| App interaction records | Screens you open, buttons you tap, how far you got in a practice (number of exchanges, seconds spent, which step you reached), types of errors and the error messages shown on screen, your answers to "Was this helpful?" (the answer, the type of reason, and the score at the time), and the result and voice level of the microphone test. These do not include the text you enter or your voice | Making the App easier to use and investigating problems |
| Real-life missions | The missions you choose, their results (did it / couldn't do it / skipped), and an optional short reflection you write (up to 200 characters) | Reflection and displaying your records |
| Recordings | Recordings of what you say using voice input (automatically deleted after 7 days) | So you can listen back to your own voice later |
| Purchase information | Product ID, records of purchases, renewals, and expirations, and expiration dates | Determining whether a paid plan is active |
The device identifier is a random number generated by the App. It is not your device's unique ID or the advertising identifier (IDFA).
It cannot be matched with data from other apps or services.
3. How We Handle Voice
When you use voice input, the recording is sent for transcription and for evaluating how you speak.
So that you can listen back to your own voice, recordings are stored on the App's server for 7 days only and are automatically deleted after that period.
If you use "Settings > Delete data," they are deleted immediately, without waiting 7 days.
The transcribed text and the speaking figures (speed, pauses, number of filler words, etc.) are saved to record your progress.
In conversation practice, audio is recorded only while you are pressing the record button. If you choose "Tap to start, tap again to send" in Settings, the App records from your first tap until your second tap (up to 45 seconds).
The microphone test shown at the start of a voice conversation records for 3 seconds to check your voice level. This audio is not sent anywhere and is discarded right away.
In the explanation drill, pressing "Speak" prepares the microphone, and after a 5-second preparation time, the App records for up to 30 seconds (or until you press "Done speaking").
The App never records in the background.
When you use voice in the explanation drill, the audio is sent to the Gemini API for transcription, but it is not stored on the App's server. The text of your explanation is sent for scoring and is not stored on the server. The scoring results (score, comments, model answer, and improved version) are saved so you can review them later. The improved version and comments are written by AI based on your explanation. You can delete the scoring results with "Delete data."
3-1. Message Reply Practice and Real-Life Missions
The replies you write in the message reply practice, the partner's messages, and the review results are stored on the App's server so you can review them later. Your replies and the partner's messages are sent to the Gemini API to generate responses and reviews.
Short reflections on real-life missions are stored only on the App's server and are not sent to any outside party. Please do not include information that could identify another person, such as their name, in your reflections.
All of these can be deleted with "Settings > Delete data."
3-2. How We Handle Purchase Information
Payments for paid plans are processed through Apple. The App never receives your credit card information.
The App uses services provided by RevenueCat, Inc. to manage purchases.
The device identifier, the product ID purchased, and the dates and times of purchases, renewals, and expirations are sent to RevenueCat.
Your name, email address, and similar information are not sent.
- RevenueCat Privacy Policy: https://www.revenuecat.com/privacy
4. Data Sent to Outside Parties
To generate responses and feedback, conversation content and voice are sent to the
Gemini API (Google AI) and Vertex AI (Google Cloud; used for things like the partner's voice) provided by Google LLC.
- Recipient: Google LLC (United States)
- What is sent: conversation text, voice data, and scene settings
- What is not sent: device identifier, usage history, and other identifying information
Google's handling of this data is governed by Google's privacy policy.
https://policies.google.com/privacy
The App uses a paid API and operates under settings in which the data sent is not
used to train Google's models.
When you first launch the App, it explains on screen what is sent and to whom, and provides the conversation features only after you give your consent.
If you do not consent, the conversation features cannot be used.
5. Advertising and Analytics
The App does not include any SDKs for advertising or behavioral analytics.
App interaction records used to make the App easier to use are stored only on the App's server and are not sent to any outside service.
We do not provide or sell your information to third parties.
6. Data Retention and Deletion
- Conversation history and speaking data are stored on the App's server
- You can completely delete your conversation history, recordings, speaking data, practice records, and app interaction records at any time from "Settings > Delete data" in the App
- However, purchase information (product ID, records of purchases, renewals, and expirations, and expiration dates) is not deleted and remains on the server so we can handle refunds and inquiries and prevent fraudulent purchases. It does not include information that identifies you, such as your name
- Deletion cannot be undone
- If you start using the App again on the same device after deletion, a new device identifier is issued and it will not be linked to your previous data
- If you delete your data while subscribed to a paid plan, your subscription itself is not canceled, but because the device identifier changes, the link to your purchase is lost. You can restore it with "Restore Purchases" in the App
7. Age
The App is intended for use by adults, but it does not collect any information about your age.
8. Contact
For questions about this policy, please contact the support channel listed on
the App's App Store page, or use the contact form: https://tamagoen56.com/contact/?app=komyu
9. Changes
If we change this policy, we will update the "Last updated" date on this page and
announce important changes within the App.