KOBUSHI Privacy Policy

This is an English translation provided for convenience. If there is any discrepancy, the Japanese version prevails.

KOBUSHI (X: @kobushi_tekken; the "Operator") sets out below how user information is handled in the application "KOBUSHI" (the desktop app and the web version; the "App").

1. Information We Collect

The Operator does not collect any information except what you choose to send us. Specifically:

Account: The App's core features can be used without an account. If you create an account, we hold your email address and a random user ID issued by the system. We do not use or store a password (authentication is via Google, Discord, or anonymous sign-in only). If you sign in with Google or Discord, we receive the identifier and email address that the service provides.
Your content: Sheets, cards, notes and other data you create are first stored on your device (browser local storage, etc.). While you use an account, the content is automatically sent to and stored in the cloud (Supabase) each time you edit it (auto-save).
Community sharing: The knowledge you enter is shared with other users. See Section 3 for details.
Match Scan (screen recognition): Screen images captured by this feature are processed only on your device and are never transmitted anywhere. Only when a character name cannot be identified, an image and a log are temporarily written to a temporary folder on your device for troubleshooting (overwritten each time; they do not accumulate).
Feedback form: Only when you submit the form, its contents together with a random device identifier and your browser/OS information are sent to the Operator. Nothing is sent automatically.
Usage analytics: The App has no telemetry that reports your actions or created data to the Operator. However, we send and aggregate the following for two purposes: (1) counting update checks and downloads, and (2) understanding whether people keep using the App. Both are used only to estimate roughly how much, and how continuously, the App is used; neither includes your actions or created data.
- (1) Connection & download counts: The desktop app connects to the official site on startup to check for updates. The Operator counts these connections and downloads on the serving side. To know how many devices launched on a given day, we also record an irreversible string derived from the IP address combined with a secret value that changes daily (we do not store the IP address itself; because the string differs the next day, this record alone cannot track the same user across days).
- (2) Continued use: On startup the App sends an anonymous installation ID generated and stored on your device (the same random value used for the feedback form; not linked to your name, email address, account, or IP address). Because this ID is stable, we can tell whether the same device keeps using the App over time, but we do not use it to identify individuals.

2. Cloud Save (optional, free)

Purpose: A backup against device failure, replacement, or browser-data clearing, and to let you use the same notes on multiple devices.
Optional: Cloud save is an optional, free feature. If you don't use it, the core features work as they are (your data stays only on your device).
Auto-save: While cloud save is enabled, your content is sent automatically each time you edit it, replacing the cloud copy with the latest state. No manual save is needed.
Where it's stored: In a service (database) provided by Supabase Inc. What is stored is your sheets, cards, notes and similar data as of the last auto-save, your email address, and your user ID.
Protection: Row-level security ensures you can only read and write your own data. Communications are encrypted.
Limited purpose: The Operator does not use stored data for any purpose other than providing the service to you (no analytics, advertising, or disclosure to third parties).
Deletion: You can completely delete your account and your cloud data at any time from "Delete account" in Settings (data on your device remains).

3. Community Sharing

Purpose: So that players build up and share their knowledge with each other, allowing the core features to be offered for free.
What is shared: The knowledge you enter (moves added to quick checks and cards, move notes, matchup notes, and the like). These are sent to the KOBUSHI community database and aggregated and shown to other users.
What is not sent: Screenshots, and anything you have not entered, are never sent.
Condition of use: Sharing is a condition of using an account; there is no setting to disable it. If you do not wish to share, do not enter the relevant information.
Deletion: If a submission is problematic, or you would like something removed, contact us at the address at the end of this Policy.

4. Access Logs for This Site and the Web Version

This site and the web version are served from Vercel. In the course of delivery, that provider may technically record access logs such as IP addresses. Their handling is subject to that provider's privacy policy. The Operator does not use those logs to identify individuals.

5. Cookies

The App does not use cookies for advertising or tracking. It uses browser local storage solely to store your settings and the data you create, and to keep you signed in.

6. Disclosure to Third Parties

Except as required by law, the Operator does not disclose user information to third parties. If you use cloud save, storage of the data is entrusted to Supabase Inc. (storage location: Tokyo region).

7. Changes to this Policy

The Operator may amend this Policy. An amended Policy takes effect when posted within the App or on the official website. If there is a material change to how information is handled, we will announce it within the App or on the official website.

8. Contact

Questions about this Policy: kobushi.tekken@gmail.com / X: @kobushi_tekken

Effective: 2026-07-10 / Last updated: 2026-07-25 (documented usage measurement: counting connections/downloads, and sending an anonymous installation ID to understand continued use)