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If you need a straightforward tool for your personal computer, BitMeter OS is an excellent open-source choice compatible with Windows, macOS, and Linux.

3. (Best for Traffic Forensics)

Wireshark is the industry standard for network protocol analysis. While it is more of a diagnostic tool than a simple "meter," it is indispensable for finding the exact source of a bandwidth spike. WhatsUp Gold 9 Best Network Monitoring Tools for 2026 - WhatsUp Gold bandwidth monitoring software free download