Top-level domain
.io
71 measured sites. 3 of them, 4.2%, block at least one answer-surface AI crawler. Mean readiness score 67.7.
Compare against every other top-level domain
| Rank | Domain | Score | Answer-surface crawlers | Stack |
|---|---|---|---|---|
| 126 | github.io | Score 55 out of 100, grade D | all allowed | Fastly |
| 175 | adobe.io | Score 61 out of 100, grade C | all allowed | Fastly |
| 450 | ipinfo.io | Score 74 out of 100, grade C | all allowed | Next.js . Google Cloud / GFE |
| 612 | pushy.io | Score 52 out of 100, grade D | all allowed | unidentified |
| 638 | branch.io | Score 89 out of 100, grade B | all allowed | WordPress . Cloudflare |
| 662 | intercom.io | Score 88 out of 100, grade B | all allowed | Next.js . Amazon CloudFront |
| 695 | wpguardian.io | Score 70 out of 100, grade C | all allowed | WordPress . Cloudflare |
| 729 | itch.iorefused GPTBot | Score 65 out of 100, grade C | all allowed | Cloudflare |
| 824 | liftoff.io | Score 76 out of 100, grade B | all allowed | HubSpot CMS . Cloudflare |
| 869 | oxylabs.io | Score 73 out of 100, grade C | all allowed | Next.js . Cloudflare |
| 889 | pendo.io | Score 79 out of 100, grade B | all allowed | Next.js . Vercel |
| 898 | readthedocs.iorefused GPTBot | Score 50 out of 100, grade D | all allowed | Cloudflare |
| 899 | agora.io | Score 68 out of 100, grade C | all allowed | HubSpot CMS . Cloudflare |
| 935 | docker.io | Score 80 out of 100, grade B | all allowed | WordPress . Fastly |
| 1038 | bidmachine.iorefused GPTBot | Score 52 out of 100, grade D | all allowed | Webflow . Cloudflare |
| 1044 | statuspage.io | Score 62 out of 100, grade C | all allowed | Amazon CloudFront |
| 1138 | netcraze.io | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 1384 | cardgames.io | Score 58 out of 100, grade D | all allowed | Amazon CloudFront |
| 1442 | ssstik.iorefused GPTBot | Score 92 out of 100, grade A, partial assessment | all allowed | Cloudflare |
| 1678 | indown.iorefused GPTBot | Score 92 out of 100, grade A, partial assessment | all allowed | Cloudflare |
| 1975 | split.io | Score 59 out of 100, grade D | all allowed | Cloudflare |
| 1979 | privacymanager.io | Score 77 out of 100, grade B | all allowed | Cloudflare |
| 2031 | nic.io | Score 57 out of 100, grade D | all allowed | unidentified |
| 2077 | metamask.io | Score 81 out of 100, grade B | all allowed | Contentful . Cloudflare |
| 2081 | shodan.iorefused GPTBot | Score 78 out of 100, grade B, partial assessment | all allowed | Cloudflare |
| 2160 | customer.io | Score 81 out of 100, grade B | all allowed | Sanity . Vercel |
| 2384 | trustindex.io | Score 72 out of 100, grade C | all allowed | WordPress . Amazon CloudFront |
| 2393 | home-assistant.io | Score 66 out of 100, grade C | all allowed | Cloudflare |
| 2397 | mediago.io | Score 55 out of 100, grade D | all allowed | Nuxt . Amazon CloudFront |
| 2497 | ogury.io | Score 80 out of 100, grade B | all allowed | WordPress . Cloudflare |
| 2518 | snapcraft.io | Score 85 out of 100, grade B | all allowed | unidentified |
| 2593 | pxf.io | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 2614 | aditude.io | Score 64 out of 100, grade C | all allowed | Framer |
| 2712 | sslip.io | Score 54 out of 100, grade D | all allowed | unidentified |
| 2735 | huntress.io | Score 6 out of 100, grade F, partial assessment | 11 blocked | unidentified |
| 2791 | cloudx.io | Score 74 out of 100, grade C | all allowed | Next.js . Vercel |
| 2797 | redis.io | Score 90 out of 100, grade A | all allowed | Sanity . Cloudflare |
| 2995 | avs.io | Score 69 out of 100, grade C | all allowed | Amazon CloudFront |
| 3010 | webflow.io | Score 67 out of 100, grade C | all allowed | Webflow . Cloudflare |
| 3062 | nexx360.io | Not scored | all allowed | unidentified |
| 3106 | guard.io | Score 69 out of 100, grade C | all allowed | Cloudflare |
| 3159 | merkle.io | Score 57 out of 100, grade D | all allowed | Next.js . Cloudflare |
| 3188 | 0xrpc.io | Score 52 out of 100, grade D | all allowed | Fastly |
| 3266 | azurecontainerapps.io | Score 55 out of 100, grade D | all allowed | Adobe Experience Manager . Azure Front Door |
| 3292 | nextdns.io | Score 55 out of 100, grade D | all allowed | Next.js . Cloudflare |
| 3342 | nip.io | Score 54 out of 100, grade D | all allowed | unidentified |
| 3512 | gitbook.io | Score 68 out of 100, grade C | all allowed | HubSpot CMS . Cloudflare |
| 3782 | plausible.io | Score 65 out of 100, grade C | all allowed | Bunny |
| 3836 | elevenlabs.io | Score 91 out of 100, grade A | all allowed | Next.js . Google Cloud / GFE |
| 3889 | piano.io | Score 68 out of 100, grade C | all allowed | Framer . Cloudflare |
| 3912 | connectad.io | Score 60 out of 100, grade C | all allowed | HubSpot CMS . Cloudflare |
| 3929 | complianz.io | Score 87 out of 100, grade B | all allowed | HubSpot CMS . Cloudflare |
| 3970 | codepen.iorefused GPTBot | Score 78 out of 100, grade B, partial assessment | all allowed | Cloudflare |
| 3990 | netbird.io | Score 64 out of 100, grade C | all allowed | Next.js . Vercel |
| 4090 | ably.io | Score 89 out of 100, grade B | all allowed | Gatsby . Cloudflare |
| 4189 | jumpjump.io | Score 84 out of 100, grade B, partial assessment | all allowed | Cloudflare |
| 4253 | advolve.io | Score 78 out of 100, grade B, partial assessment | all allowed | unidentified |
| 4273 | growthbook.io | Score 76 out of 100, grade B | all allowed | Cloudflare |
| 4277 | termly.io | Score 86 out of 100, grade B | all allowed | WordPress . Cloudflare |
| 4327 | bitdrift.iorefused GPTBot | Score 57 out of 100, grade D | all allowed | Next.js . Amazon CloudFront |
| 4328 | sanity.io | Score 75 out of 100, grade B | all allowed | Sanity . Vercel |
| 4389 | kandji.io | Score 64 out of 100, grade C | all allowed | HubSpot CMS . Cloudflare |
| 4431 | gohugo.io | Score 57 out of 100, grade D | all allowed | Netlify |
| 4446 | opensea.io | Score 77 out of 100, grade B | all allowed | Next.js . Cloudflare |
| 4474 | gitlab.iorefused GPTBot | Score 63 out of 100, grade C | all allowed | Nuxt . Cloudflare |
| 4498 | greenhouse.io | Score 70 out of 100, grade C | all allowed | Cloudflare |
| 4560 | missena.io | Score 78 out of 100, grade B, partial assessment | all allowed | Amazon CloudFront |
| 4790 | island.io | Score 59 out of 100, grade D | all allowed | HubSpot CMS . Cloudflare |
| 4919 | fpjs.io | Score 82 out of 100, grade B | all allowed | Gatsby . Vercel |
| 4984 | ghcr.io | Score 60 out of 100, grade C | all allowed | Contentful |
| -- | aireport.fidgetlabs.io | Score 83 out of 100, grade B | all allowed | Next.js . Vercel |
| -- | fidgetlabs.io | Score 82 out of 100, grade B | all allowed | Next.js . Vercel |
Using these figures
Free to reuse in research, journalism or a product under CC BY 4.0, with credit to Fidget Labs BV. Quote the measurement date so the claim stays checkable as the index moves.
CrawlIndex by Fidget Labs BV. "Agent readiness on .io." https://crawlindex.org (measured 2026-09-22). Licensed CC BY 4.0.