antennasim
Explore dipoles, loops, phased arrays and electromagnetic fields in a free interactive antenna simulator.
Added 9 Nov 2026
Analysed 9 Nov 2026
via Hacker News, also on 
What we found
- We found no privacy policy or terms of service.
- It sends none of the six security headers we check.
- It publishes DMARC but no SPF record, so receivers cannot tell which servers may send its email.
- The site is hosted on GitHub Pages and served through Fastly, with a domain registered in 2025.
Built with: 7 technologies
| Technology | Type |
|---|---|
| Infrastructure | |
Fastly
|
CDN |
GoDaddy DNS
|
DNS |
GitHub Pages
|
Hosting |
| Build & Framework | |
p5.js
|
JavaScript library |
jsDelivr
|
Package CDN |
| Analytics & Marketing | |
Cloudflare Web Analytics
|
Analytics |
Google Search Console
|
SEO |
Each technology links to its own page: which other new sites launched with it.
Site checks
| Custom title and meta description | |
| Open Graph tags (title, image, description) missing og:image | |
| Twitter card meta tags | |
| Canonical URL declared | |
| Responsive viewport meta tag | |
| Favicon present | |
| Semantic HTML (nav, main, article) | |
| Meta description is 189 characters Google only shows about 155–160 characters of the description in desktop search results (less on mobile); anything past that won't appear. |
| Referrer-Policy | |
| X-Frame-Options | |
| Permissions-Policy experimental | |
| X-Content-Type-Options | |
| Content-Security-Policy | |
| Strict-Transport-Security | |
| X-XSS-Protection deprecated, not counted |
| Privacy policy not detected | |
| Terms of service not detected | |
| Consent manager analytics set no tracking cookies on our visit (it may be opt-in) | |
| Detection works best on English-language sites |
| robots.txt | |
| sitemap.xml 2 URLs | |
| security.txt optional | |
| llms.txt optional | |
| ads.txt only for ad-funded sites | |
| humans.txt optional |
| llms.txt published not published | |
| No AI bots blocked in robots.txt | |
| Content-Signal none declared | |
| Link headers none advertised |
| State | Record | Status |
|---|---|---|
| SPF | Not published | |
| DMARC p=reject | Reject (strict) | |
| DKIM | Not found at common selectors | |
| MTA-STS | Not deployed | |
| TLS-RPT | Not configured |
Without SPF, receivers cannot tell which servers may send email for this domain.
Hosting and network
| Network | FASTLY - Fastly, Inc., US AS54113, US |
|---|---|
| DNS | GoDaddy DNS authoritative nameservers |
| DNSSEC | Not enabled DNS answers are unsigned |
| Certificate | Let's Encrypt valid 30 Sep 2026 to 29 Dec 2026, as captured |
| Domain age | 1 year registered Jul 2025, GoDaddy.com, LLC |
| Green hosting | Yes per The Green Web Foundation |
| Page build | 3 JS files, 0 CSS files 3 third-party domains |
| Brand colours |
Storage: 0 items
Nothing stored in the browser on page load.
Performance
| Measure | This site | Reading |
|---|---|---|
| Server response | 171 ms | good, faster than 67% of sites |
| Largest contentful paint | 1,860 ms | good |
| Layout shift | 0.00 | good |
| Page weight | 308 KB | light |
| Third-party domains | 3 | |
| Console errors | 0 | none |
| Failed requests | 0 | none |
From a single automated render of the home page. A quick guide, not a substitute for Lighthouse or field data. How we measure
Notes
- Looks AI-built: no AI signals. How much the site looks AI-generated. It is a pattern match shown for interest, not a verdict.
- Performance comes from one render on 9 November 2026 and will vary between visits.
How we know
FirstSited records what new websites are built with, usually within a day of going live. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We checked this one in full: its tech stack, DNS, security headers and page basics. This page is what we saw on 9 November 2026; the live site may have changed since.
Every technology below links to its own page: which other new sites launched with it. Watch any of them and get every new site that uses it as it goes live, from £15 a month.