Privacy Policy

Last Updated: May 18, 2026

日本語版 / Japanese version

Note: The Japanese version is the official text. In case of any discrepancy between the Japanese and English versions, the Japanese version shall prevail.

1. Business Operator Information

2. Basic Policy

The Service respects User privacy and strives to protect personal information. The Service operates in a browser, and User data is processed only within the User's device.

3. Information Collection

  1. The Service does not collect the following information. The Service has no account system.
    • Contact information such as name, address, phone number, email address
    • Payment information such as credit card information
  2. The Service collects the following access analytics information for the purposes of service improvement and operational stability. This information does not include session IDs, User dataset contents, file names, column names, names of features used, error message bodies, or stack traces.
    • Page views
    • Referrer URL
    • Country/region information
    • User-Agent string (browser and OS type, etc.)
    • Access date and time
    • The fact that the launcher view was shown
    • The fact that the project view was shown
    • The fact that the project view was hidden or closed, and the number of seconds it was visible
    • The fact that an unhandled JavaScript error was caught, and a token indicating the error type (e.g., TypeError, RangeError)
    • The application version
  3. The Service is delivered through the infrastructure of Cloudflare, Inc. In this process, Cloudflare processes and retains request information, including IP addresses. The Provider accesses this information retained by Cloudflare only when necessary for security purposes. It is not used for behavioral tracking or profiling of Users.
  4. The access analytics information described in paragraph 2 is processed in a form that cannot identify individuals and is used only for statistical analysis or security response.

4. Data Processing and Storage

  1. Files and project data loaded by Users in the Service are processed only within the User's browser and are not sent to the Provider's servers.
  2. Files and project data uploaded by Users are stored only in the User's device local storage (IndexedDB/OPFS).
  3. The Provider cannot access Users' files or project data.
  4. The access analytics information described in Article 3, paragraph 2 is stored on Cloudflare's infrastructure and automatically deleted after a maximum of 6 months.
  5. The retention period for the request information described in Article 3, paragraph 3 is governed by the terms of Cloudflare, Inc.

5. Use of External Services

  1. The Service uses services provided by Cloudflare, Inc. for infrastructure delivery, collection and aggregation of access analytics information, and security.
  2. Access analytics is performed without using cookies.
  3. Information collected is processed in accordance with Cloudflare, Inc.'s Privacy Policy. For details, please see:

6. Provision to Third Parties

  1. Files and project data loaded by Users in the Service are processed only within the User's device and are not sent to the Provider's or third-party servers.
  2. The information described in Article 3, paragraphs 2 and 3 is provided to Cloudflare, Inc. to the extent necessary for operating the services described in Article 5, paragraph 1.
  3. User information will not be provided to third parties for purposes other than those described in the preceding paragraph.

7. Data Security

  1. Since User data is stored only within the User's device, data security depends on the User's device and browser security settings.
  2. Users are responsible for appropriately protecting their devices and browsers.

8. Changes to This Policy

  1. The Provider may change this Policy as necessary.
  2. Changes to the Policy shall take effect upon publication on the Service.
  3. If significant changes are made, the Provider may request renewed agreement to the Privacy Policy on the Service.

9. Contact

For inquiries regarding this Policy, please contact:

Revision History

DateSummary
May 18, 2026Withdrew the statement that IP addresses are not collected. Disclosed that Cloudflare's infrastructure processes and retains request information including IP addresses. Specified that this information is used only for security purposes and not for behavioral tracking or profiling. Removed specific Cloudflare service names from Article 5 and removed the clause stating that personally identifiable information is not written to these services (former Article 5, paragraph 3)
May 8, 2026Previous version Added country/region information and User-Agent string to the access analytics collection. Consolidated the access analytics and usage telemetry descriptions in Article 3, and centralized references to specific Cloudflare services in Article 5
May 6, 2026Discontinued use of Cloudflare Workers Observability. Removed clauses related to server log collection (Article 3 paragraph 3, the first part of Article 4 paragraph 4, Article 5 paragraph 3, and the relevant mention in Article 6 paragraph 2) and renumbered subsequent paragraphs
May 5, 2026Added disclosure of server log collection (Workers Observability) and usage telemetry (Analytics Engine). Scoped Article 4 to Users' files and project data
October 18, 2025Initial version

By using MIDAS, you acknowledge that you have read and understood this Privacy Policy.