What powers 
emailopen.com?
Last seen Sep 2026 · 17 technologies across 11 categories
Analytics
Google Analytics
since Aug 2022
Authentication
Google Sign-in
since Dec 2025
CDN
Cloudflare
since Aug 2022
Font scripts
Font Awesome
since Dec 2023
Google Font API
since Dec 2023
JavaScript frameworks
Vue.js
since Dec 2023
JavaScript libraries
Miscellaneous
Rich text editors
CKEditor
since Dec 2023
RUM
Datadog
since Dec 2023
Security
HSTS
since Sep 2022
Webmail
Microsoft 365
since Jun 2024
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 not checked
- ai.txt not checked
AI Crawlers
No AI crawlers blocked
Audience
- 73% desktop
- 27% phone
United States
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.57 / 10 · ranked #828,540 of all domains
51 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.1 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English
- CDN: Cloudflare
- Weight: 7.5 MB · 508 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on INTERNAP-BLK (216.133.255.173)
- DNS: Cloudflare DNS
- Email: Microsoft 365
- Email security: SPF (hard fail), DMARC quarantine
- SSL: Google Trust Services, ECDSA P256, expires Nov 2026
- Common Crawl link graph: rank 6,961,182, 4 hosts
- Verified with: Google, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| start.emailopen.com | 16 |
| www.emailopen.com | 6 |
Full technology history →
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Recent changes
- dropped cdnjs Jan 2026