Pricing

$5.00 / 1,000 result items

Website Change Monitor

Monitor any list of URLs for true content changes — CSS-selector targeting, keyword watches, noise-filtered diffing and webhook-on-change. Built for scheduled runs. Pay per result.

Pricing

$5.00 / 1,000 result items

Rating

0.0

(0)

Developer

ziv shay

Actor stats

Bookmarked

Total users

Monthly active users

4 days ago

Last modified

What it does

Fetches each URL, extracts the watched region (whole page or a CSS selector).
Normalizes content and compares it to the previous run's snapshot (stored in a persistent named Key-Value store — it survives between scheduled runs).
Emits a structured change-event per URL that actually changed: added/removed lines, counts, a unified-diff preview, a 0–1 change ratio, and keyword appeared/disappeared signals.
A minChangeRatio threshold suppresses trivial edits.

Why it's different

True-change detection, not raw-HTML diffing. Volatile noise is stripped before comparison, so you don't get paged on a cache-buster.
State persists across scheduled runs. It compares against your last run, not within one run — the only way change detection actually works on a schedule.
Clean output. addedLines / removedLines / changeRatio / keywordsAppeared are webhook-ready — your consumer acts on the fields, no HTML parsing.

Input

Field	Type	Description
`startUrls`	array	URLs to watch. Strings, or objects with per-URL `url` + `selector` + `keywords`.
`selector`	string	Global CSS selector applied to URLs that don't set their own. Blank = whole `<body>`.
`keywords`	array	Words to watch; run reports present + appeared/disappeared (e.g. `In stock`, `Sold out`).
`mode`	string	`text` (default, ignores markup churn) or `html`.
`minChangeRatio`	number	0–1. Only flag a change when ≥ this fraction of lines changed.
`emitUnchanged`	boolean	Also output unchanged URLs (default off → webhook fires only on real changes).
`storeArchive`	boolean	Store previous content for line-level diffs (default on).
`proxyConfiguration`	object	Apify proxy (recommended).

Example input

{
  "startUrls": [
    "https://news.ycombinator.com",
    { "url": "https://shop.example.com/item", "selector": ".price", "keywords": ["In stock", "Sold out"] }
  ],
  "minChangeRatio": 0.02
}

Output

One change-event per changed/first-seen/errored URL:

{
  "url": "https://shop.example.com/item",
  "changed": true,
  "changeType": "changed",
  "fingerprint": "a1b2c3d4e5f60718",
  "previousFingerprint": "9988776655443322",
  "addedLines": ["$24.99", "In stock"],
  "removedLines": ["$29.99", "Sold out"],
  "addedCount": 2,
  "removedCount": 2,
  "changeRatio": 0.5,
  "keywordsAppeared": ["In stock"],
  "keywordsDisappeared": ["Sold out"],
  "preview": "- $29.99\n- Sold out\n+ $24.99\n+ In stock",
  "checkedAt": "2026-06-21T13:40:00.000Z",
  "previousCheckedAt": "2026-06-21T12:40:00.000Z"
}

changeType is one of: first_seen, unchanged, below_threshold, changed, error.

Schedule + webhook

Schedule the actor (e.g. hourly/daily) — the named state store remembers the last snapshot between runs.
Add an Apify webhook on run succeeded and, in your endpoint, act on rows where changed: true. Or use the dataset's changed/changeType fields to filter.

Pricing

Pay per result — you're charged per change-event row returned. Default output mode only returns rows that changed (or were first-seen / errored), so steady-state monitoring of stable pages is cheap.

Built by MoneyMachine. Public data only; respect each site's terms and robots.

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