Website Change Monitor — Content Diff & Alerts

Monitor any website for content changes. Compare text content, HTML hashes, or specific CSS selectors between runs. Webhook alerts when changes are detected. Use with Apify scheduling for automated daily/weekly monitoring. 5 URLs.

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How it works

1. First run: Fetches each URL, extracts text content, computes a hash. Saves snapshot.
2. Subsequent runs: Provide previousDatasetId from the last run. The actor compares hashes and reports which pages changed.
3. Webhook: If any page changed, POSTs the diff to your webhook URL.

Use with Apify Scheduling (cron) to run daily/weekly and get notified when competitor pages, pricing, or content changes.

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Quick start

{
    "urls": ["https://example.com", "https://github.com"],
    "mode": "text"
}

Second run (with comparison):

{
    "urls": ["https://example.com", "https://github.com"],
    "mode": "text",
    "previousDatasetId": "DATASET_ID_FROM_FIRST_RUN"
}

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Comparison modes

Mode	What it compares	Best for
text	Extracted visible text (no HTML/scripts/styles)	Content changes, blog posts, pricing
hash	Full HTML including markup	Any structural change
selector	Content inside a specific CSS element	Targeting specific sections (#price, .product-info)

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Input

Field	Type	Default	Description
urls	array	(required)	URLs to monitor
mode	enum	text	Comparison mode: text, hash, or selector
selector	string	(optional)	CSS selector for selector mode (#id, .class, tag)
previousDatasetId	string	(optional)	Dataset ID from previous run for change detection
timeout	integer	15000	Request timeout per page
webhookUrl	string	(optional)	POST alert when content changes
dryRun	boolean	false	Monitor without charges

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Output

{
    "url": "https://example.com",
    "contentHash": "a1b2c3d4e5f6g7h8",
    "textContent": "Example Domain This domain is for use in illustrative examples...",
    "contentLength": 1256,
    "statusCode": 200,
    "checkedAt": "2026-04-14T10:00:00Z",
    "changed": true,
    "previousHash": "x9y8z7w6v5u4t3s2",
    "diff": "Added: New pricing section with updated rates",
    "status": "success"
}

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Pricing

$0.003 per URL checked (pay-per-event pricing).

• Errors and dry runs are never charged.
• 100 URLs daily = $0.285/day = ~$8.55/month

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Related actors in this suite

Other tools by accurate_pouch for site monitoring + crawling:

• Broken Link Checker — Recursive crawl, sitemap + robots.txt parsing, webhook, Sheets export. $0.005/page.
• Sitemap Analyzer — Parse, validate, status-check URLs, sitemap indexes. $0.004/sitemap.
• SSL Monitor — Certificate chain, expiry, fingerprint, key size, webhook. $0.004/domain.
• TheCrawler — Web scraper + LLM-powered structured extraction. AGPL-3.0, also on npm (thecrawler@0.1.1). $0.005/page.
• Lighthouse Auditor — PageSpeed Insights API, Core Web Vitals, deltas. $0.005/audit.

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Run on Apify

No setup needed. Click above to run in the cloud. $0.003 per operation.