Ocrenger, developed by 株式会社パスカル (Corp. Pascal), is a user-only application that serves as a contact network system. It is designed to provide safety confirmation during disasters and emergencies, as well as serve as a bulletin board for normal communication. Ocrenger is utilized by various organizations including companies, schools, hospitals, and local governments.

To register, simply launch the app and select "Account" from the bottom icon. In the account section, click the upper right (+) button and enter the provided ID and authentication key from your affiliation.

Ocrenger offers several features and benefits. The app boasts an easy-to-use interface, providing intuitive and convenient navigation. Personal information, such as email addresses, is not required for registration. Users can reply to emergency situations, ensuring effective communication during crises. The system is also robust, with servers located both domestically and internationally. Additionally, Ocrenger automatically delivers earthquake and weather information to keep users informed. Furthermore, the app includes a bulletin board feature, allowing users to engage in mutual communication.