MIST Kizuki

Checks what you send to ChatGPT and Claude, and the answers, on your device, so you notice personal or confidential details.

Check sensitive information before sending it to AI. MIST Kizuki is a Chrome extension that checks text for potentially personal, confidential or authentication information before you send it to ChatGPT or Claude. It provides warnings, blocks sending or offers masking when needed, and checks AI answers on your device. Use it to review information before asking AI to help with work documents, emails or customer communications. MIST Kizuki is intended for individuals and organizations in Japan and overseas. Features - Checks input immediately before sending - Displays GREEN / YELLOW / RED results - Provides warnings, blocks sending or offers masking based on the information detected - Lets you review masked text before sending - Checks information in AI answers - Helps prevent accidental Enter submission when confirming Japanese IME input - Helps prevent duplicate submissions - Detects changes to supported service screens and provides diagnostics and self-tests Data handling Input text, AI answers and detected secrets are checked on your device and are not sent to our servers. Communications are used for sign-in authentication and subscription management. Text you choose to send goes to the ChatGPT or Claude service you are using. Please see the privacy policy for details. Supported environment ChatGPT and Claude websites in Chrome on a PC. Operation on smartphones and tablets has not been verified. How to use 1. Add MIST Kizuki to Chrome. 2. Register and sign in with your email address, then start the initial 14-day free trial. 3. Enter text on the ChatGPT or Claude website. 4. Review the result shown when sending. Revise or mask information as needed, and review the text again after masking. Free trial and pricing The initial 14-day free trial does not require a credit card and does not automatically convert to a paid subscription. To continue using the protection features, choose a Pro plan: - JPY 980 per month, tax included, automatically renewed monthly - JPY 9,800 per year, tax included, automatically renewed annually After purchase, the same extension becomes Pro; no reinstallation is needed. You can cancel through Manage subscription and continue using Pro until the end of the paid period. Your next billing date is shown in Manage subscription. When your free trial or paid subscription period ends, protection features, including checks, warnings and masking, stop. This does not prevent ordinary use of ChatGPT or Claude. Limitations Detection is a guide for reviewing information. It cannot detect every kind of personal, confidential or authentication information, and a GREEN result does not guarantee safety. Always review the text, including after masking, and decide for yourself what to send. Changes to supported websites may affect functionality. Each AI service has its own terms and privacy policy. Provider and seller エム・アイ・エス・テクノロジー株式会社 (Japan) Support kizuki@mist.co.jp Please do not send passwords, API keys or actual confidential information in support requests. Include your Chrome version, the affected service and the operation that caused the problem. A patent application has been filed for technology related to MIST Kizuki.