AppNetPlotter

AppNetPlotter is an open-source Windows application that helps you investigate slow apps, interrupted video calls, and other connectivity problems. It brings internet, Wi-Fi, wired network, VPN, and individual app connection information into one interface, helping you understand where a problem may be occurring. Internet stability is estimated by continuously monitoring your apps’ existing TCP connections, without generating separate internet test traffic. Response times, delay variation, retransmissions, and upload/download activity provide insight into the connections your applications are actually using. Local gateway checks help assess Wi-Fi and wired network stability. Key features

• Per-app connection monitoring: View running apps and their connections, with available domain names, response times, stability estimates, and upload/download rates.
• Internet stability: Follow connection quality over time using measurements from existing TCP traffic.
• Wi-Fi and wired network diagnostics: Monitor local gateway response times and stability to help identify local network problems.
• VPN visibility: Detect VPN adapters and view estimated VPN path stability alongside traffic rates.
• UDP traffic monitoring: Track upload/download activity through Windows ETW, including traffic from QUIC, games, and VPN applications.
• Interactive history: Inspect graphs at a particular time and compare measurements across the last 24 hours.
• Shareable reports: Export a selected time range as an HTML report for IT support or further investigation.
• Local data storage: Keep monitoring history on your computer, without requiring a central monitoring server.
• Flexible deployment: Use a portable executable or install a background monitoring service with a separate desktop interface.