LagLens

LagLens is a web app (with optional desktop agent) that monitors live stream health from the viewer’s perspective across regions and ISPs. Instead of relying on your encoder stats, it spins up lightweight “synthetic viewers” in key geographies, measures startup time, buffering ratio, bitrate drops, audio desync, and end-to-end latency, then alerts you with a clear root-cause guess (CDN edge, origin, encoder, DRM, player, or last-mile). It also correlates issues with ad breaks, scene changes, and ingest settings to pinpoint what actually triggered the drop in QoE. The MVP focuses on HLS/DASH streams and outputs a simple scorecard per event plus a timeline of incidents. This is not a consumer streaming app; it’s a reliability tool for teams who lose money when streams stutter.