Observed arrival · 2026-08-27

sincewhen watches the web for meaningful changes

sincewhen.dev Observed source

Editorial interest 79/100 Selection signal · not a rating of the site

A webpage-diff service that monitors URLs, removes boilerplate, and delivers normalized markdown changes through an API, MCP, RSS, or webhooks.

Landing page captured for the 2026-08-27 issue.

Field notes

The service creates a normalized markdown snapshot for each watched URL, removing navigation, footers, scripts, and cache-busting noise before comparing versions. Its documented MCP interface includes add_watch, list_watches, changes_since, get_diff, and get_current_snapshot, while RSS and webhooks provide additional delivery paths. The free tier lists five pages with daily checks and 30 days of history; Pro lists 100 pages, hourly checks, one year of history, AI summaries, and change webhooks.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

⊠LoginAccess appeared gated

$PaidCommerce or pricing visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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