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It samples the public cumulative byte counters macOS exposes for the active physical interface, records only differences between samples, and discards the raw readings. Physical-interface totals can include protocol overhead. NetLens Pro does not identify apps, sites, devices, DNS, IP addresses, packets, requests, headers, bodies, or traffic content, and it cannot reconstruct usage while closed or paused.

Tracking does not need location. macOS requires Location permission only if you ask NetLens Pro to read the current Wi-Fi network name. Grant access in System Settings > Privacy & Security > Location Services, or keep it denied and use Unidentified Wi-Fi. NetLens Pro does not request or store coordinates or scan nearby networks.

NetLens Pro measures only this Mac and only confirmed observation time while tracking is active. A provider or router can count other devices, different time boundaries, protocol overhead, retries, rounding, roaming, or billing rules. Pauses, sleep, and closed-app periods are not estimated. Treat NetLens Pro as a local aid, not an authoritative bill or whole-network meter.

CSV export is created only when you request it and omits network names unless you choose to include them. Review and protect the file. Settings > Privacy & Data > Delete Everything removes usage history, network names, alert rules, and insights but retains ordinary app settings; exported CSV files remain at their destinations. History retention can be configured, while profile lifetime totals can survive history pruning until Delete Everything.

NetLens Pro is paid up front with no subscription or in-app purchase in the reviewed version. Apple processes the purchase and eligible refund requests and does not provide Brent with your full payment-card details. Use Apple’s Report a Problem service or Apple Support for billing.