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Website Change Monitor: Detect Page & Text Changes

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Checks a list of URLs and returns only the pages whose content changed since the last run: unified diff, added/removed lines, SHA-256 hashes. Optional CSS selector, keyword triggers and ignore regexes. Plain HTTP, respects robots.txt. $0.001 per URL checked, $0.005 per change.

Pricing

from $1.00 / 1,000 url checkeds

Rating

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(0)

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3 hours ago

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You can access the Website Change Monitor: Detect Page & Text Changes programmatically from your own applications by using the Apify API. You can also choose the language preference from below. To use the Apify API, you’ll need an Apify account and your API token, found in API & Integrations in Apify Console.

Python

JavaScript

CLI

OpenAPI

HTTP

MCP

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            "items": {
              "type": "object",
              "required": [
                "url"
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              "properties": {
                "url": {
                  "type": "string",
                  "title": "URL of a web page",
                  "format": "uri"
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            }
          },
          "monitorName": {
            "title": "Monitor name",
            "type": "string",
            "description": "Name of this watch list. Snapshots are kept in a named key-value store in your own account (website-change-monitor-<name>), so different watch lists don't clash. Keep it the same between scheduled runs.",
            "default": "default"
          },
          "selector": {
            "title": "CSS selector (all pages)",
            "type": "string",
            "description": "Optional. Only compare the part of each page matching this CSS selector, e.g. main, #pricing, .job-list. A per-URL selector overrides this."
          },
          "mode": {
            "title": "Compare",
            "enum": [
              "text",
              "html"
            ],
            "type": "string",
            "description": "Visible text ignores whitespace, scripts, styles and comments. HTML compares the markup itself.",
            "default": "text"
          },
          "keywords": {
            "title": "Keyword triggers",
            "type": "array",
            "description": "Optional. If set, a change is only reported when one of these keywords appears or disappears (case-insensitive). Leave empty to report every change.",
            "items": {
              "type": "string"
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          },
          "keywordTrigger": {
            "title": "Keyword trigger",
            "enum": [
              "any",
              "appears",
              "disappears"
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            "type": "string",
            "description": "Which keyword movement counts as a change.",
            "default": "any"
          },
          "ignorePatterns": {
            "title": "Ignore patterns",
            "type": "array",
            "description": "Optional regular expressions (case-insensitive) removed from the text before comparing, for dates, counters, timestamps, etc. Example: \\d{1,2}:\\d{2} or Updated .* ago. Invalid regexes are matched as plain text.",
            "items": {
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          },
          "outputBaseline": {
            "title": "Output baseline on first run",
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            "title": "Reset baseline",
            "type": "boolean",
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            "default": false
          },
          "maxUrls": {
            "title": "Max pages",
            "minimum": 1,
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            "type": "integer",
            "description": "Only the first N pages are checked.",
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          },
          "concurrency": {
            "title": "Concurrency",
            "minimum": 1,
            "maximum": 20,
            "type": "integer",
            "description": "Pages checked in parallel. Requests to the same site are always made one at a time.",
            "default": 5
          },
          "perHostDelaySecs": {
            "title": "Delay between requests to the same site (seconds)",
            "minimum": 0.5,
            "maximum": 30,
            "type": "number",
            "description": "Politeness gap per host. A longer Crawl-delay in robots.txt is respected (up to 10 s).",
            "default": 1
          },
          "maxDiffChars": {
            "title": "Max diff length (characters)",
            "minimum": 500,
            "maximum": 50000,
            "type": "integer",
            "description": "The unified diff in each result is cut to this length.",
            "default": 4000
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                "type": "string",
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                "type": "string",
                "format": "date-time",
                "example": "2025-01-08T00:00:00.000Z"
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              "status": {
                "type": "string",
                "example": "READY"
              },
              "meta": {
                "type": "object",
                "properties": {
                  "origin": {
                    "type": "string",
                    "example": "API"
                  },
                  "userAgent": {
                    "type": "string"
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Website Change Monitor API: Page Diff & Keyword Alerts OpenAPI definition

OpenAPI is a standard for designing and describing RESTful APIs, allowing developers to define API structure, endpoints, and data formats in a machine-readable way. It simplifies API development, integration, and documentation.

OpenAPI is effective when used with AI agents and GPTs by standardizing how these systems interact with various APIs, for reliable integrations and efficient communication.

By defining machine-readable API specifications, OpenAPI allows AI models like GPTs to understand and use varied data sources, improving accuracy. This accelerates development, reduces errors, and provides context-aware responses, making OpenAPI a core component for AI applications.

You can download the OpenAPI definitions for Website Change Monitor: Detect Page & Text Changes from the options below:

OpenAPI.json

If you’d like to learn more about how OpenAPI powers GPTs, read our blog post.

You can also check out our other API clients:

Website Change Monitor: Detect Page & Text Changes API in Python

Website Change Monitor: Detect Page & Text Changes API in JavaScript

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Website Change Monitor: Detect Page & Text Changes API

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