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Website Change Monitor - AI Page Diff Tracker

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Monitor any website for changes. Visual diffs, AI change summaries, and significance scoring.

Pricing

Pay per usage

Rating

0.0

(0)

Developer

viralanalyzer

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Total users

Monthly active users

14 hours ago

Last modified

Website Change Monitor 🔔 Detect Page Changes with AI Summaries

Monitor any website for content changes. Get notified when pages update, with optional AI-powered change summaries via Gemini.

✨ Features

Feature	Description
🔍 Change Detection	Compare page content snapshots across runs
🎯 CSS Selector	Monitor specific page sections (prices, stock, headlines)
📊 Diff Report	See exactly what was added/removed
🤖 AI Summary	Optional Gemini-powered human-readable change descriptions
⚡ Multi-URL	Monitor multiple pages in a single run

📋 Input Example

{
    "urls": ["https://news.ycombinator.com", "https://www.nubank.com.br"],
    "cssSelector": "",
    "mode": "text",
    "changeThreshold": 1,
    "enableAiSummary": false
}

Input Fields

Field	Type	Required	Description
`urls`	string[]	Yes	URLs to monitor for changes
`cssSelector`	string	No	CSS selector to monitor specific page sections
`mode`	string	No	Comparison mode: `text`, `html`, or `visual_hash` (default: `text`)
`changeThreshold`	integer	No	Min change % to report (default: 1, use 0 for any change)
`maxSnapshotSize`	integer	No	Max chars per snapshot (default: 500000)
`enableAiSummary`	boolean	No	Enable Gemini AI change summaries (default: false)
`geminiApiKey`	string	No	Gemini API key for AI summaries
`navigationTimeoutSecs`	integer	No	Page load timeout in seconds (default: 30)
`maxConcurrency`	integer	No	Parallel page fetches (default: 5)

📊 Output Example

First run stores a baseline:

{
    "url": "https://news.ycombinator.com",
    "status": "📌 Baseline stored",
    "currentHash": "98be55967d3148a8...",
    "previousHash": null,
    "changePercent": 0,
    "checkedAt": "2026-02-19T05:47:00.000Z"
}

Subsequent runs detect changes:

{
    "url": "https://news.ycombinator.com",
    "status": "🔴 Change detected",
    "changePercent": 15.3,
    "addedLines": ["New HN post title 1", "New HN post title 2"],
    "removedLines": ["Old post title"],
    "addedPreview": "New HN post title 1 | New HN post title 2",
    "removedPreview": "Old post title",
    "currentHash": "a1b2c3d4...",
    "previousHash": "98be55967d3148a8...",
    "checkedAt": "2026-02-19T06:00:00.000Z",
    "previousCheckedAt": "2026-02-19T05:47:00.000Z"
}

💡 Use Cases

Price Monitoring — Track product price changes on e-commerce sites
Job Listings — Get alerted when new positions appear on career pages
News Tracking — Monitor news sites for breaking stories
Competitor Watch — Detect changes to competitor websites
Stock/Inventory — Monitor availability changes for products

💰 Pricing

Pay per page check — $0.005/check. Uses Apify pay-per-event model.

⚖️ Legal

This actor accesses publicly available web pages. Ensure your use complies with applicable laws and site terms of service.

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