Development and operation
The service was launched in August 2019 by LIHKG member 5YH; according to the developer, the website had more than ten thousand unique visitors on the first day. It gathers reports from instant messaging service Telegram on police patrols and tear gas deployments. The service allows users to track police activity on Hong Kong streets, providing ongoing information on police movements via messages and GPS locations. This allows citizens to move away from areas where police action may take place, and notify others of actions that may be taken in different places.
The service is available in an Android version via the Google Play Store and in a web version, while the iOS version was removed by Apple.