# Detect changes to a terms of service page

**Use case:** 

Watches a legal page (example: GitHub Terms of Service) and compares each new full-page screenshot with the previous run. When more than 0.2% of the page changes you get changed = true, the changed percentage and a highlighted diff image. Schedule it weekly to track terms, privacy policy or compliance page updates.

## Input

```json
{
  "startUrls": [
    {
      "url": "https://docs.github.com/en/site-policy/github-terms/github-terms-of-service"
    }
  ],
  "maxUrls": 5,
  "devices": [
    "desktop"
  ],
  "fullPage": true,
  "format": "png",
  "jpegQuality": 80,
  "savePdf": false,
  "hideCookieBanners": true,
  "blockTrackers": true,
  "darkMode": false,
  "scrollToBottom": true,
  "waitUntil": "load",
  "delayMs": 800,
  "compareWithPrevious": true,
  "monitorName": "terms-of-service-monitor",
  "changeThresholdPercent": "0.2",
  "maxConcurrency": 3,
  "pageTimeoutSecs": 45
}
```

## Output

```json
{
  "screenshotUrl": {
    "label": "Screenshot",
    "format": "image"
  },
  "url": {
    "label": "URL",
    "format": "link"
  },
  "device": {
    "label": "Device",
    "format": "text"
  },
  "statusCode": {
    "label": "HTTP",
    "format": "number"
  },
  "title": {
    "label": "Title",
    "format": "text"
  },
  "width": {
    "label": "Width",
    "format": "number"
  },
  "height": {
    "label": "Height",
    "format": "number"
  },
  "changePercent": {
    "label": "Changed %",
    "format": "number"
  },
  "changed": {
    "label": "Changed",
    "format": "boolean"
  },
  "diffImageUrl": {
    "label": "Diff",
    "format": "image"
  },
  "pdfUrl": {
    "label": "PDF",
    "format": "link"
  },
  "error": {
    "label": "Error",
    "format": "text"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The Website Screenshot API & Visual Change Monitor Actor is ready to run with the inputs already set for "Detect changes to a terms of service page". [Sign up or log in](https://console.apify.com/create-task-from-example/XlhU82fd789ulJlED) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Detect changes to a terms of service page" task

The Website Screenshot API & Visual Change Monitor Actor will start running based on the input automatically. You can also change all the input fields, like URLs to capture, max urls, and more, to match your specific use case.

### 3. Receive the "Detect changes to a terms of service page" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as screenshot, URL, device, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "Detect changes to a terms of service page" task via API](https://apify.com/datacolada/website-screenshot-monitor.md).

## About this Actor

This example demonstrates how to use [Website Screenshot API & Visual Change Monitor](https://apify.com/datacolada/website-screenshot-monitor.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/datacolada/website-screenshot-monitor.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/datacolada/website-screenshot-monitor.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).