AI readiness leaderboard · Email marketing
AI readiness of customer.io: 100/100
100/100
We checked customer.io on 2026-10-18 with our free checker: six scored tests plus evidence for each finding. The score reflects the site on that date. The site may have changed after that date.
| Test | Result | Points |
|---|---|---|
| llms.txt | Yes | 15 of 15 |
| JSON-LD schema on the homepage | Yes | 20 of 20 |
| Meta description | Yes | 10 of 10 |
| Text readable without JavaScript | Yes | 20 of 20 |
| Sitemap | Yes | 10 of 10 |
| AI crawlers allowed in robots.txt | 8 of 8 | 25 of 25 |
Compared with Email marketing
customer.io ranks 5 of 21 email marketing sites in this scan (ties share the order by domain name). The median score in this group is 100. 15 of 21 have an llms.txt file.
Findings with evidence
Improvellms.txt found, with gaps
First line: "# Customer.io". 11 ## sections, 50 links, 15082 bytes.
Fix: Add a one-line > summary under the heading.
ImproveJSON-LD: 1 block, types Organization, ImageObject, PostalAddress, ContactPoint, Person, WebSite
Person is missing recommended url.
Fix: Fix the listed properties, then retest at validator.schema.org.
ImproveServer responded in 1063 ms
Time to response headers from our checker. Final URL: https://customer.io/
Fix: Slow responses can make crawlers give up. Add page caching or a CDN in front of the homepage.
ImproveHTML size 479 KB, 117 script tags
1 render-blocking script in <head>: /_next/static/chunks/polyfills-42372ed130431b0a.js
Fix: Large HTML slows crawlers and tools with size limits. Move inline data and scripts out of the HTML.
17 checks passed or noted
PassGPTBot (OpenAI, training): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
PassOAI-SearchBot (OpenAI, ChatGPT search): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
PassChatGPT-User (OpenAI, live fetch for users): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
PassClaudeBot (Anthropic, training): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
PassClaude-SearchBot (Anthropic, Claude search): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
PassPerplexityBot (Perplexity, search index): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
PassGoogle-Extended (Google, Gemini training control): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
PassCCBot (Common Crawl, open dataset): allowed on /
User-agent: * Allow: / Disallow: /api Disallow: /studio Disallow: /we-hate-spam Disallow: /learn/announcements/update-to-compromised-email-addresses-incident (1 more lines) Matching rule: "allow: /" in group "*".
NoteNo llms-full.txt
GET /llms-full.txt returned 404.
Fix: Optional: publish /llms-full.txt with the full text of key pages for tools that want more than a map.
PassTitle, 61 characters
<title>Customer.io: Customer Engagement Platform For Better Outcomes</title>
PassMeta description, 156 characters
content="Customer.io is a customer engagement platform for creating personalized journeys and better business outcomes across email, push, SMS, and in-app messaging."
PassOpen Graph tags present
og:title: Customer.io: Customer Engagement Platform For Better Outcomes og:description: Customer.io is a customer engagement platform for creating personalized journeys and bett… og:image: https://cdn.sanity.io/images/onirtmj2/production/5e497275070e44cc06b05b4f2398ded18148f51b…
PassCanonical link set
<link rel="canonical" href="https://customer.io">
PassLanguage declared: en
<html lang="en">
Pass1 H1 heading
<h1>More impact from every message m e s s a g e</h1>
Pass4,561 characters of text without JavaScript
Text starts: "Customer.io: Customer Engagement Platform For Better Outcomes Platform Solutions Resources Pricing Sign in Get started Get started Book a demo Book a demo More…"
PassSitemap found, 552 URLs
robots.txt: Sitemap: https://customer.io/sitemap.xml GET https://customer.io/sitemap.xml returned 200.
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See how all 21 email marketing sites compare: common problems, real evidence and the full table.
Scoring: llms.txt 15, JSON-LD 20, meta description 10, readable text 20, sitemap 10, AI crawler access 25. Want this page changed or removed? Email [email protected].
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