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Why your uptime monitor says everything is fine while users see a white screen

HTTP 200 does not mean your page actually works. Here are the failure modes that ping monitors miss and how visual screenshot monitoring catches them.

May 2026

How to build a visual uptime monitor with Go and headless Chrome

A technical walkthrough of building screenshot-based visual diffing: Chrome DevTools Protocol, pixel diffs, object storage, job queues, and the gotchas.

May 2026