The Witness – Understand exactly what changed when a page updates

Summary: The Witness monitors public URLs by taking scheduled full-page screenshots, filtering out noise like cookie banners and ad rotations, and using AI to provide clear, plain-English summaries of changes. Alerts are sent via Slack, Discord, Telegram, or email, enabling users to track meaningful updates without parsing raw HTML diffs.

What it does

The Witness captures screenshots using Playwright, extracts text, removes irrelevant elements, and applies a two-pass Gemini Vision analysis to identify and rate changes on a 0-100 scale. It delivers concise briefs instead of raw diffs.

Who it's for

It is designed for users who need to monitor website changes precisely, such as tracking price updates or content modifications without manual checking or reading HTML code.

Why it matters

The Witness solves the problem of noisy, uninformative change alerts by providing clear, actionable summaries that highlight significant updates and reduce false positives.