Traffic Light: Network Tracker is a free, open-source utility for Android that focuses on monitoring network usage while prioritizing user privacy. This tool is designed for users who need to keep track of their data consumption, particularly those with multiple SIM cards. It offers an array of features including data plan tracking, beautiful widgets, and a status bar network indicator for easy access to your usage stats.

In addition to real-time monitoring, Traffic Light provides in-depth historical data tracking and at-a-glance usage analytics, making it simple to understand your network habits over time. The application is optimized for performance, using less battery than similar tools, and boasts a fast, modern interface with a stunning design. Overall, Traffic Light is an excellent choice for anyone looking to manage their network usage effectively.