{"workflow":{"id":14379,"name":"Monitor legal policy changes with Google Sheets, Gmail and GPT-4o","views":2,"recentViews":1,"totalViews":2,"createdAt":"2026-03-26T16:24:02.021Z","description":"## Terms of Service Change Watcher with AI Summaries\nAutomatically monitors Terms of Service, Privacy Policy, and other legal pages for changes. When content changes are detected, GPT-4o analyzes the old vs new text and emails you a plain-English summary with an impact rating.\n\n### How it works\n1. Every day at 8 AM, the workflow reads your list of URLs from a Google Sheet\n2. Each page is fetched and stripped to plain text\n3. The text is compared against the previously stored version\n4. If a change is detected, the old and new content are sent to GPT-4o for analysis\n5. You receive an email with a summary of exactly what changed and how it impacts you\n6. All changes are logged to a Change Log sheet for a historical record\n\n### Setup\n1. Create a Google Sheet with two tabs: **Pages** (columns: `url`, `page_name`, `last_content`, `last_checked`) and **Change Log** (columns: `date`, `page_name`, `url`, `summary`)\n2. Add the URLs you want to monitor in the Pages tab — leave `last_content` and `last_checked` empty\n3. Connect your **Google Sheets OAuth2**, **Gmail OAuth2**, and **OpenAI API** credentials\n4. Update the Google Sheet document in all four Google Sheets nodes\n5. Set your email address in the Send Change Alert node\n6. Run once to save baselines, then activate the workflow","workflow":{"id":"97fJO1imnmJICW28","meta":{"instanceId":"d39e63d8d47083831155098ec99e729de23429bd015d4c35004b165314dfb83d","templateCredsSetupCompleted":true},"name":"Terms of Service Change Watcher with AI Summaries","tags":[],"nodes":[{"id":"d1a1b1c1-0001-4000-8000-000000000001","name":"Daily Check","type":"n8n-nodes-base.scheduleTrigger","position":[112,480],"parameters":{"rule":{"interval":[{"triggerAtHour":8}]}},"typeVersion":1.3},{"id":"d1a1b1c1-0002-4000-8000-000000000002","name":"Get Pages to Monitor","type":"n8n-nodes-base.googleSheets","position":[336,480],"parameters":{"options":{},"sheetName":{"__rl":true,"mode":"name","value":"Pages"},"documentId":{"__rl":true,"mode":"id","value":"YOUR_GOOGLE_SHEET_ID"}},"credentials":{"googleSheetsOAuth2Api":{"id":"credential-id","name":"Google Sheets account 2"}},"typeVersion":4.7},{"id":"d1a1b1c1-0003-4000-8000-000000000003","name":"Fetch Page","type":"n8n-nodes-base.httpRequest","onError":"continueRegularOutput","position":[544,480],"parameters":{"url":"={{ $json.url }}","options":{},"sendHeaders":true,"headerParameters":{"parameters":[{"name":"User-Agent","value":"Mozilla/5.0 (compatible; TOSWatcher/1.0)"}]}},"typeVersion":4.4},{"id":"d1a1b1c1-0004-4000-8000-000000000004","name":"Extract & Compare","type":"n8n-nodes-base.code","position":[768,480],"parameters":{"mode":"runOnceForEachItem","jsCode":"// Get HTTP response\nconst resp = $input.item.json;\nconst pageData = $('Get Pages to Monitor').item.json;\nconst checkedAt = new Date().toISOString().split('T')[0];\n\n// Detect HTTP errors\nif (resp.error || resp.statusCode >= 400 || resp.status >= 400) {\n  return {\n    url: pageData.url,\n    page_name: pageData.page_name,\n    new_content: '', old_content: '',\n    old_content_for_ai: '', new_content_for_ai: '',\n    changed: false, is_first_run: false,\n    error: 'HTTP error: ' + (resp.error?.message || resp.statusCode || resp.status || 'unknown'),\n    checked_at: checkedAt\n  };\n}\n\n// Get response body\nlet html = '';\nif (typeof resp.data === 'string') html = resp.data;\nelse if (typeof resp.body === 'string') html = resp.body;\nelse if (typeof resp === 'string') html = resp;\nelse html = JSON.stringify(resp);\n\n// Check for Cloudflare/bot challenges\nif (html.includes('Enable JavaScript and cookies') || html.includes('cf-challenge') || html.includes('_cf_chl')) {\n  return {\n    url: pageData.url,\n    page_name: pageData.page_name,\n    new_content: '', old_content: '',\n    old_content_for_ai: '', new_content_for_ai: '',\n    changed: false, is_first_run: false,\n    error: 'Page is behind Cloudflare bot protection - use a different URL',\n    checked_at: checkedAt\n  };\n}\n\n// Check for empty/tiny responses\nif (!html || html.length < 200) {\n  return {\n    url: pageData.url,\n    page_name: pageData.page_name,\n    new_content: '', old_content: '',\n    old_content_for_ai: '', new_content_for_ai: '',\n    changed: false, is_first_run: false,\n    error: 'Page returned empty or very short content',\n    checked_at: checkedAt\n  };\n}\n\n// Strip HTML tags to get plain text\nlet text = html\n  .replace(/<script[^>]*>[\\s\\S]*?<\\/script>/gi, '')\n  .replace(/<style[^>]*>[\\s\\S]*?<\\/style>/gi, '')\n  .replace(/<[^>]+>/g, ' ')\n  .replace(/&nbsp;/gi, ' ')\n  .replace(/&amp;/gi, '&')\n  .replace(/&lt;/gi, '<')\n  .replace(/&gt;/gi, '>')\n  .replace(/&#\\d+;/gi, '')\n  .replace(/\\s+/g, ' ')\n  .trim()\n  .substring(0, 40000);\n\n// Compare with previously stored content\nconst oldContent = (pageData.last_content || '').trim();\nconst isFirstRun = oldContent === '';\nconst changed = !isFirstRun && oldContent !== text;\n\n// Build smart AI context: find WHERE the texts differ\nlet oldForAi = oldContent.substring(0, 10000);\nlet newForAi = text.substring(0, 10000);\n\nif (changed && oldContent.length > 0) {\n  // Find first point of difference\n  let diffStart = 0;\n  const minLen = Math.min(oldContent.length, text.length);\n  for (let i = 0; i < minLen; i++) {\n    if (oldContent[i] !== text[i]) {\n      diffStart = i;\n      break;\n    }\n    if (i === minLen - 1) diffStart = minLen;\n  }\n\n  // Take context: 500 chars before diff, then 4500 chars after\n  const contextBefore = Math.max(0, diffStart - 500);\n  const prefix = contextBefore > 0 ? '...[IDENTICAL CONTENT SKIPPED]... ' : '';\n\n  const oldDiffSection = prefix + oldContent.substring(contextBefore, contextBefore + 5000);\n  const newDiffSection = prefix + text.substring(contextBefore, contextBefore + 5000);\n\n  // Also grab the tail end of both texts (last 3000 chars)\n  const oldTail = oldContent.length > 5000 ? '\\n\\n...[SKIPPING TO END]...\\n' + oldContent.substring(oldContent.length - 3000) : '';\n  const newTail = text.length > 5000 ? '\\n\\n...[SKIPPING TO END]...\\n' + text.substring(text.length - 3000) : '';\n\n  oldForAi = (oldDiffSection + oldTail).substring(0, 12000);\n  newForAi = (newDiffSection + newTail).substring(0, 12000);\n\n  // Add length comparison as context\n  oldForAi = '[Total length: ' + oldContent.length + ' chars]\\n' + oldForAi;\n  newForAi = '[Total length: ' + text.length + ' chars]\\n' + newForAi;\n}\n\nreturn {\n  url: pageData.url,\n  page_name: pageData.page_name,\n  new_content: text,\n  old_content: oldContent,\n  old_content_for_ai: oldForAi,\n  new_content_for_ai: newForAi,\n  changed: changed,\n  is_first_run: isFirstRun,\n  checked_at: checkedAt\n};"},"typeVersion":2},{"id":"d1a1b1c1-0005-4000-8000-000000000005","name":"Content Changed?","type":"n8n-nodes-base.if","position":[992,480],"parameters":{"options":{},"conditions":{"options":{"version":2,"leftValue":"","caseSensitive":true,"typeValidation":"loose"},"combinator":"and","conditions":[{"id":"cond-changed","operator":{"type":"boolean","operation":"true","singleValue":true},"leftValue":"={{ $json.changed }}","rightValue":""}]}},"typeVersion":2.3},{"id":"d1a1b1c1-0006-4000-8000-000000000006","name":"Summarize Changes","type":"@n8n/n8n-nodes-langchain.chainLlm","position":[1216,272],"parameters":{"text":"=You are a legal document analyst. You MUST compare the two text versions below word-by-word and identify ONLY real, verifiable differences. Do NOT guess or generalize. Every change you list must quote the actual text that was added, removed, or modified.\n\nPage: {{ $json.page_name }} ({{ $json.url }})\n\n--- OLD VERSION ---\n{{ $json.old_content_for_ai }}\n\n--- NEW VERSION ---\n{{ $json.new_content_for_ai }}\n\nRules:\n- ONLY report changes you can verify by comparing the two texts above\n- Quote the specific text that changed (use \"was: ...\" and \"now: ...\" format)\n- If large sections were added or removed, summarize what was added/removed with a brief quote\n- If you cannot find concrete differences, say so honestly\n- NEVER fabricate or assume changes that are not visible in the text\n\nRespond in this format:\n\n**Overview:** One sentence on what changed.\n\n**Changes:**\n- [Quote the specific old text → new text for each change]\n\n**Impact Level:** LOW (cosmetic/formatting), MEDIUM (policy clarification), or HIGH (new restrictions, rights changes, data handling changes)\n\n**What This Means For Users:** Brief practical impact in 1-2 sentences.","batching":{},"promptType":"define"},"typeVersion":1.9},{"id":"d1a1b1c1-0007-4000-8000-000000000007","name":"OpenAI Chat Model","type":"@n8n/n8n-nodes-langchain.lmChatOpenAi","position":[1328,480],"parameters":{"model":{"__rl":true,"mode":"list","value":"gpt-4o","cachedResultName":"gpt-4o"},"options":{},"builtInTools":{}},"credentials":{"openAiApi":{"id":"credential-id","name":"OpenAi account"}},"typeVersion":1.3},{"id":"d1a1b1c1-0008-4000-8000-000000000008","name":"Build Email Body","type":"n8n-nodes-base.code","position":[1520,272],"parameters":{"jsCode":"// Get AI summaries and build email bodies\nconst items = $input.all();\nconst results = [];\n\nfor (const item of items) {\n  const summary = item.json.text || item.json.output || 'No summary available';\n  const p = $('Extract & Compare').item.json;\n\n  const body = '<h2>TOS Change Detected</h2>' +\n    '<p><strong>Page:</strong> ' + p.page_name + '</p>' +\n    '<p><strong>URL:</strong> <a href=\"' + p.url + '\">' + p.url + '</a></p>' +\n    '<p><strong>Detected:</strong> ' + p.checked_at + '</p>' +\n    '<hr><h3>AI Summary of Changes</h3>' +\n    '<div>' + summary.replace(/\\n/g, '<br>') + '</div>' +\n    '<hr><p style=\"color:#666;font-size:12px;\">Generated by your TOS Change Watcher workflow in n8n.</p>';\n\n  results.push({\n    json: {\n      email_subject: 'TOS Change Alert: ' + p.page_name,\n      email_body: body,\n      url: p.url,\n      page_name: p.page_name,\n      summary: summary,\n      checked_at: p.checked_at,\n      new_content: p.new_content\n    }\n  });\n}\n\nreturn results;"},"typeVersion":2},{"id":"d1a1b1c1-0009-4000-8000-000000000009","name":"Send Change Alert","type":"n8n-nodes-base.gmail","position":[1744,272],"webhookId":"5bbca9d6-7cb0-48f1-9d65-9b168ff286f5","parameters":{"sendTo":"user@example.com","message":"={{ $json.email_body }}","options":{"appendAttribution":false},"subject":"={{ $json.email_subject }}"},"credentials":{"gmailOAuth2":{"id":"credential-id","name":"Gmail account 2"}},"typeVersion":2.2},{"id":"d1a1b1c1-0010-4000-8000-000000000010","name":"Log Change","type":"n8n-nodes-base.googleSheets","position":[1968,272],"parameters":{"columns":{"value":{"url":"={{ $('Build Email Body').item.json.url }}","date":"={{ $('Build Email Body').item.json.checked_at }}","summary":"={{ $('Build Email Body').item.json.summary }}","page_name":"={{ $('Build Email Body').item.json.page_name }}"},"schema":[{"id":"date","type":"string","display":true,"required":false,"displayName":"date","defaultMatch":false,"canBeUsedToMatch":true},{"id":"page_name","type":"string","display":true,"required":false,"displayName":"page_name","defaultMatch":false,"canBeUsedToMatch":true},{"id":"url","type":"string","display":true,"required":false,"displayName":"url","defaultMatch":false,"canBeUsedToMatch":true},{"id":"summary","type":"string","display":true,"required":false,"displayName":"summary","defaultMatch":false,"canBeUsedToMatch":true}],"mappingMode":"defineBelow"},"options":{},"operation":"append","sheetName":{"__rl":true,"mode":"name","value":"Change Log"},"documentId":{"__rl":true,"mode":"id","value":"YOUR_GOOGLE_SHEET_ID"}},"credentials":{"googleSheetsOAuth2Api":{"id":"credential-id","name":"Google Sheets account 2"}},"typeVersion":4.7},{"id":"d1a1b1c1-0011-4000-8000-000000000011","name":"Update Page Record","type":"n8n-nodes-base.googleSheets","position":[2192,272],"parameters":{"columns":{"value":{"url":"={{ $('Build Email Body').item.json.url }}","last_checked":"={{ $('Build Email Body').item.json.checked_at }}","last_content":"={{ $('Build Email Body').item.json.new_content }}"},"schema":[{"id":"url","type":"string","display":true,"required":false,"displayName":"url","defaultMatch":true,"canBeUsedToMatch":true},{"id":"page_name","type":"string","display":true,"removed":true,"required":false,"displayName":"page_name","defaultMatch":false,"canBeUsedToMatch":true},{"id":"last_content","type":"string","display":true,"required":false,"displayName":"last_content","defaultMatch":false,"canBeUsedToMatch":false},{"id":"last_checked","type":"string","display":true,"required":false,"displayName":"last_checked","defaultMatch":false,"canBeUsedToMatch":false}],"mappingMode":"defineBelow","matchingColumns":["url"]},"options":{},"operation":"appendOrUpdate","sheetName":{"__rl":true,"mode":"name","value":"Pages"},"documentId":{"__rl":true,"mode":"id","value":"YOUR_GOOGLE_SHEET_ID"}},"credentials":{"googleSheetsOAuth2Api":{"id":"credential-id","name":"Google Sheets account 2"}},"typeVersion":4.7},{"id":"d1a1b1c1-0012-4000-8000-000000000012","name":"Update Last Checked","type":"n8n-nodes-base.googleSheets","position":[1312,704],"parameters":{"columns":{"value":{"url":"={{ $json.url }}","last_checked":"={{ $json.checked_at }}","last_content":"={{ $json.new_content }}"},"schema":[{"id":"url","type":"string","display":true,"required":false,"displayName":"url","defaultMatch":true,"canBeUsedToMatch":true},{"id":"page_name","type":"string","display":true,"removed":true,"required":false,"displayName":"page_name","defaultMatch":false,"canBeUsedToMatch":true},{"id":"last_content","type":"string","display":true,"required":false,"displayName":"last_content","defaultMatch":false,"canBeUsedToMatch":false},{"id":"last_checked","type":"string","display":true,"required":false,"displayName":"last_checked","defaultMatch":false,"canBeUsedToMatch":false}],"mappingMode":"defineBelow","matchingColumns":["url"]},"options":{},"operation":"appendOrUpdate","sheetName":{"__rl":true,"mode":"name","value":"Pages"},"documentId":{"__rl":true,"mode":"id","value":"YOUR_GOOGLE_SHEET_ID"}},"credentials":{"googleSheetsOAuth2Api":{"id":"credential-id","name":"Google Sheets account 2"}},"typeVersion":4.7},{"id":"ff8245b2-e93e-4e59-a788-cdbd45168947","name":"Sticky Note","type":"n8n-nodes-base.stickyNote","position":[-496,112],"parameters":{"width":480,"height":576,"content":"## Terms of Service Change Watcher with AI Summaries\n\n### How it works\n\n1. Schedules a daily check using Daily Check. 2. Retrieves URLs from a Google Sheets workbook. 3. Fetches the specified pages and compares content. 4. Uses an AI model to summarize changes if detected. 5. Sends a change alert email and logs the change.\n\n### Setup steps\n\n- [ ] Set up Google Sheets credentials for retrieving and storing page data\n- [ ] Configure the OpenAI Chat Model for generating AI summaries\n- [ ] Set up Gmail credentials to send email alerts\n\n### Customization\n\nTo monitor different URLs, update the Google Sheets file with new entries."},"typeVersion":1},{"id":"569e6c4b-1e32-4115-bba9-a44c2b617e55","name":"Sticky Note1","type":"n8n-nodes-base.stickyNote","position":[16,112],"parameters":{"color":7,"height":320,"content":"## Daily scheduling\n\nInitiates the workflow on a daily schedule to start the monitoring process."},"typeVersion":1},{"id":"df09ebc6-6e09-485f-9e52-de324eb3ad6e","name":"Sticky Note2","type":"n8n-nodes-base.stickyNote","position":[304,112],"parameters":{"color":7,"width":400,"height":304,"content":"## Fetch pages for monitoring\n\nRetrieves list of pages to monitor from Google Sheets and fetches each page's content."},"typeVersion":1},{"id":"b41ea4ec-843a-45e2-8cee-1dd752b63b83","name":"Sticky Note3","type":"n8n-nodes-base.stickyNote","position":[720,64],"parameters":{"color":7,"width":416,"height":304,"content":"## Content comparison\n\nCompares the fetched content with the stored version to detect changes."},"typeVersion":1},{"id":"e8a861fa-fe1a-4cd2-9bda-3cd662a48707","name":"Sticky Note4","type":"n8n-nodes-base.stickyNote","position":[1216,-176],"parameters":{"color":7,"width":352,"height":512,"content":"## AI-driven change summarization\n\nIf changes are detected, uses AI to summarize the differences between the current and previous content."},"typeVersion":1},{"id":"2d1c015b-5155-4bc6-abb1-8cd12acec10d","name":"Sticky Note5","type":"n8n-nodes-base.stickyNote","position":[1696,0],"parameters":{"color":7,"width":864,"height":272,"content":"## Email alert and logging\n\nBuilds the email content, sends alerts via Gmail, and logs the change in Google Sheets."},"typeVersion":1},{"id":"2ab6260a-1077-4802-af7e-da93e445bde5","name":"Sticky Note6","type":"n8n-nodes-base.stickyNote","position":[688,784],"parameters":{"color":7,"height":384,"content":"## Update monitoring records\n\nUpdates the Google Sheets record to reflect the latest check time, whether changes were detected or not."},"typeVersion":1}],"active":false,"pinData":{},"settings":{"binaryMode":"separate","callerPolicy":"workflowsFromSameOwner","availableInMCP":false,"executionOrder":"v1"},"versionId":"12c7e745-a7ce-4547-8c9a-0bcb3a4eb7a7","connections":{"Fetch Page":{"main":[[{"node":"Extract & Compare","type":"main","index":0}]]},"Log Change":{"main":[[{"node":"Update Page Record","type":"main","index":0}]]},"Daily Check":{"main":[[{"node":"Get Pages to Monitor","type":"main","index":0}]]},"Build Email Body":{"main":[[{"node":"Send Change Alert","type":"main","index":0}]]},"Content Changed?":{"main":[[{"node":"Summarize Changes","type":"main","index":0}],[{"node":"Update Last Checked","type":"main","index":0}]]},"Extract & Compare":{"main":[[{"node":"Content Changed?","type":"main","index":0}]]},"OpenAI Chat Model":{"ai_languageModel":[[{"node":"Summarize Changes","type":"ai_languageModel","index":0}]]},"Send Change Alert":{"main":[[{"node":"Log Change","type":"main","index":0}]]},"Summarize Changes":{"main":[[{"node":"Build Email Body","type":"main","index":0}]]},"Get Pages to Monitor":{"main":[[{"node":"Fetch Page","type":"main","index":0}]]}}},"lastUpdatedBy":1,"workflowInfo":{"nodeCount":19,"nodeTypes":{"n8n-nodes-base.if":{"count":1},"n8n-nodes-base.code":{"count":2},"n8n-nodes-base.gmail":{"count":1},"n8n-nodes-base.stickyNote":{"count":7},"n8n-nodes-base.httpRequest":{"count":1},"n8n-nodes-base.googleSheets":{"count":4},"n8n-nodes-base.scheduleTrigger":{"count":1},"@n8n/n8n-nodes-langchain.chainLlm":{"count":1},"@n8n/n8n-nodes-langchain.lmChatOpenAi":{"count":1}}},"status":"published","readyToDemo":null,"user":{"name":"Alejandro Alfonso","username":"alejandro02","bio":"Alejandro Alfonso — Founder of Duality Labs, an AI automation agency helping businesses across industries eliminate manual work and scale smarter. I build practical n8n workflows that connect AI tools, CRMs, and communication platforms into systems that run themselves. Every template I publish is production-tested and built with real client problems in mind.","verified":true,"links":["https://www.dualitylabs.ai/"],"avatar":"https://gravatar.com/avatar/f920c89da23ede9f1490a238842288c192a09253d3ec1adec27637ad74de1dbe?r=pg&d=retro&size=200"},"nodes":[{"id":18,"icon":"file:googleSheets.svg","name":"n8n-nodes-base.googleSheets","codex":{"data":{"alias":["CSV","Sheet","Spreadsheet","GS"],"resources":{"generic":[{"url":"https://n8n.io/blog/love-at-first-sight-ricardos-n8n-journey/","icon":"❤️","label":"Love at first sight: Ricardo’s n8n journey"},{"url":"https://n8n.io/blog/why-business-process-automation-with-n8n-can-change-your-daily-life/","icon":"🧬","label":"Why business process automation with n8n can change your daily life"},{"url":"https://n8n.io/blog/automatically-adding-expense-receipts-to-google-sheets-with-telegram-mindee-twilio-and-n8n/","icon":"🧾","label":"Automatically Adding Expense Receipts to Google Sheets with Telegram, Mindee, Twilio, and n8n"},{"url":"https://n8n.io/blog/supercharging-your-conference-registration-process-with-n8n/","icon":"🎫","label":"Supercharging your conference registration process with n8n"},{"url":"https://n8n.io/blog/creating-triggers-for-n8n-workflows-using-polling/","icon":"⏲","label":"Creating triggers for n8n workflows using polling"},{"url":"https://n8n.io/blog/no-code-ecommerce-workflow-automations/","icon":"store","label":"6 e-commerce workflows to power up your Shopify s"},{"url":"https://n8n.io/blog/migrating-community-metrics-to-orbit-using-n8n/","icon":"📈","label":"Migrating Community Metrics to Orbit using n8n"},{"url":"https://n8n.io/blog/automate-google-apps-for-productivity/","icon":"💡","label":"15 Google apps you can combine and automate to increase productivity"},{"url":"https://n8n.io/blog/your-business-doesnt-need-you-to-operate/","icon":" 🖥️","label":"Hey founders! 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