Rethink DNS + Firewall is a free, open-source Android app that makes it easy to monitor app activity, block ads and trackers, and circumvent Internet censorship. Key features:

🛡️ Android firewall: prevent apps from connecting to the Internet over Wi-Fi or mobile data

🚫 Content blocking: ads, trackers, malware, and more

🌍 Anti-censorship: encrypts DNS requests to bypass restrictions, with presence in 200+ locations worldwide

📊 Monitoring: logs every app’s connections and data usage

⚙️ Automated reports flag suspicious connections and reveal surveillance attempts

🔒 Privacy-first design, no accounts required

Perfect for anyone who wants system-wide privacy and control over their Android device.