Website Change Monitor

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Monitor any website for content changes. Get notified when prices change, content updates, policies are modified, or job postings appear. Stores snapshots between runs for comparison and generates human-readable diff summaries.

Features

• Three monitoring modes: Full page text, specific CSS selectors, or regex text patterns
• Smart diff comparison: Stores content snapshots and generates readable change summaries
• Noise reduction: Ignore whitespace, case, or number changes to avoid false positives
• Screenshot capture: Optional full-page screenshots when changes are detected
• JavaScript rendering: Full Playwright browser for dynamic/SPA websites
• Persistent storage: Snapshots stored in key-value store between runs

Use Cases

• Price monitoring: Track competitor pricing pages with CSS selectors
• Content tracking: Monitor blogs, news sites, or documentation for updates
• Regulatory compliance: Watch policy pages for changes
• Job monitoring: Check career pages for new postings
• Stock/availability: Monitor product pages for inventory changes
• SEO tracking: Detect changes to competitor meta tags and content

How It Works

1. First run: The actor visits each URL, extracts content, computes a hash, and stores a baseline snapshot
2. Subsequent runs: Compares current content hash against the stored snapshot
3. Change detected: Generates a diff summary showing what was added/removed
4. Results: Outputs structured data with change status, timestamps, and summaries

Input Configuration

Output

Each monitored URL produces a result with:

{
"url":"https://example.com/pricing",
"domain":"example.com",
"changed":true,
"isFirstCheck":false,
"currentHash":"abc123...",
"previousHash":"def456...",
"contentLength":5432,
"changesSummary":"Added 3 lines. Sample: New Enterprise plan at $99/mo",
"checkedAt":"2026-02-23T10:00:00Z",
"previousCheckAt":"2026-02-22T10:00:00Z",
"checkMode":"full_page"
}

Scheduling

Set up a schedule in Apify to run this actor periodically:

• Every hour for price monitoring
• Daily for content/policy tracking
• Weekly for general website monitoring

Combined with Apify's webhooks or integrations, you can send change alerts to Slack, email, or any other service.

Tips

• Use selector mode for precise monitoring (e.g., .price, .product-title)
• Enable ignoreWhitespace to avoid false positives from formatting changes
• Use ignoreNumbers when monitoring content where timestamps or counters change
• Set waitForSelector for JavaScript-heavy sites that need time to render
• Screenshots help verify what changed visually