What powers 
openspec.dev?
Last seen Sep 2026 · 9 technologies across 7 categories
Analytics
CDN
Font scripts
Miscellaneous
Performance
Security
Static site generator
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Oct 2026.
- robots.txt found
- llms.txt found
- llms-full.txt found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Standards: llms.txt, llms-full.txt
Audience
- 86% desktop
- 15% phone
United States
Germany
Brazil
India
Canada
Spain
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.42 / 10 · ranked #414,010 of all domains
69 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- CDN: Cloudflare
- Weight: 0.2 MB · 17 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- OpenSpec
- Profiles: GitHub
From the homepage's own structured data (Sep 2026).
Infrastructure
- Hosted on Cloudflare (104.21.33.203, IPv6)
- DNS: Cloudflare DNS
- Email: Google Workspace
- Email security: no SPF record, no DMARC record
- SSL: Google Trust Services, ECDSA P256, expires Dec 2026
- Common Crawl link graph: rank 1,883,017
- Verified with: Google
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Full technology history →
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Recent changes
- detected Astro Jul 2026
- detected Cloudflare Jul 2026
- detected Cloudflare Browser Insights Jul 2026
- detected Google Font API Jul 2026
- detected HSTS Jul 2026
- detected HTTP/3 Jul 2026
- detected Open Graph Jul 2026
- detected PostHog Jul 2026
- detected Priority Hints Jul 2026
- detected PostHog Dec 2025