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SignalWatch Delivers Text Diffs via Email and Webhooks Without Screenshots

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A developer built SignalWatch, a hosted web-monitoring tool that detects changes on public URLs and delivers unified text diffs rather than screenshots. The service polls pages every 15 minutes on the free plan, scopes changes using CSS selectors, and filters noise through ignore-regex and minimum change-ratio settings. Alerts can be sent via email, Slack, Discord, or HMAC-signed JSON webhooks compatible with automation tools like n8n. Unlike self-hosted alternatives such as changedetection.io, SignalWatch is a fully managed solution requiring no container setup, though it does not support JavaScript rendering or login-gated pages. The free tier allows up to three monitors with no credit card required, and a live public demo tracks the Hacker News front page.

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