Bandwidth Lens

Monitor estimated data usage per website with live totals, resource breakdowns, and local-only reports.

Bandwidth Lens helps developers estimate how much data a website or web app uses during testing. Track bandwidth usage by tab and site, reset a tab before a test flow, then export local reports for analysis. Bandwidth Lens separates upload and download usage and breaks traffic down by resource type, including HTML, scripts, styles, images, fonts, media, data/API traffic, streams, and other requests. Features: - Per-tab metering sessions for developer testing - Usage persists across same-tab navigation until manually reset - Upload and download totals - Resource type breakdowns - Site reports and open tab session reports - CSV and JSON export - Local-only storage - Light and dark mode support Bandwidth Lens estimates usage from browser-observed request metadata. Cached resources, compression, streaming, and missing response sizes can affect totals, so results should be treated as practical estimates rather than billing-grade network measurements.