Black Hole Sandbox
A realistic black hole, in your pocket. Light traced through curved spacetime, live on your iPhone. Orbit it, put it in your room in AR, then design your own.
What we found
- We found no privacy policy or terms of service.
- Analytics set tracking cookies before any opt-in, and we found no consent manager.
- It sends one of the six security headers we check; Content-Security-Policy is among those missing.
- Built with Next.js and React, the site is hosted on Vercel, with a domain registered 9 weeks before launch.
- One more gap is listed further down the page.
Built with: 13 technologies
Embed this on your site
For light pages
<a href="https://firstsited.com/launch/yqmmpgfp/black-hole-sandbox"><img src="https://firstsited.com/badge/yqmmpgfp/stack.svg" alt="Black Hole Sandbox tech stack on FirstSited" height="28"></a>
For dark pages
<a href="https://firstsited.com/launch/yqmmpgfp/black-hole-sandbox"><img src="https://firstsited.com/badge/yqmmpgfp/stack.svg?theme=dark" alt="Black Hole Sandbox tech stack on FirstSited" height="28"></a>
How it fits together
Each technology runs on, or extends, the one it sits under.
| Technology | Type |
|---|---|
| Infrastructure | |
Cloudflare DNS
|
DNS |
Vercel
|
Hosting |
| HSTS | Security |
Google Workspace
(3)
|
Business email |
| Build & Framework | |
Tailwind CSS
|
CSS framework |
React
(2)
|
Framework |
Three.js
|
JavaScript library |
Next.js
(6)
|
Meta-framework |
Apple App Store
|
Mobile |
| Analytics & Marketing | |
PostHog
(4)
|
Analytics |
Vercel Analytics
(2)
|
Analytics |
Google Search Console
|
SEO |
| Business Tools | |
Vercel Live
|
Collaboration |
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) | |
| Twitter card meta tags | |
| Canonical URL declared | |
| Responsive viewport meta tag | |
| Favicon present | |
| Semantic HTML (nav, main, article) | |
| Page title is 65 characters Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible. |
| 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 not detected; analytics set tracking cookies on our visit with no opt-in step | |
| Detection works best on English-language sites |
| robots.txt | |
| sitemap.xml 14 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 ai-train = yes | |
| Content-Signal search = yes | |
| Content-Signal ai-input = yes | |
| Link headers none advertised |
| State | Record | Status |
|---|---|---|
| SPF ~all | Soft-fail (~all), common and accepted | |
| DMARC p=none | Monitoring only (p=none) | |
| DKIM | Found | |
| MTA-STS | Not deployed | |
| TLS-RPT | Not configured |
Hosting and network
| Network | AMAZON-02 - Amazon.com, Inc., US AS16509, US |
|---|---|
| DNS | Cloudflare DNS authoritative nameservers |
| DNSSEC | Not enabled DNS answers are unsigned |
| Certificate | Let's Encrypt valid 8 Nov 2026 to 6 Feb 2027, as captured |
| Domain age | 2 months registered Sep 2026, Cloudflare, Inc. |
| Green hosting | No record per The Green Web Foundation |
| Page build | 16 JS files, 1 CSS file 1 third-party domain, code splitting |
| Brand colours |
Storage: 4 items
| Key | Size | Set by |
|---|---|---|
| ph_phc_tc5kBGDg28ucFub2gF8i37kFtyySPnsyXzcQCBosGiHY_posthog | 873 B | PostHog |
| Key | Size | Set by |
|---|---|---|
| ph_phc_tc5kBGDg28ucFub2gF8i37kFtyySPnsyXzcQCBosGiHY_posthog | 90 B | PostHog |
| ph_phc_tc5kBGDg28ucFub2gF8i37kFtyySPnsyXzcQCBosGiHY_primary_window_exists | 4 B | PostHog |
| ph_phc_tc5kBGDg28ucFub2gF8i37kFtyySPnsyXzcQCBosGiHY_session_registered_properties | 74 B | PostHog |
Performance
| Measure | This site | Reading |
|---|---|---|
| Server response | 285 ms | good, faster than 50% of sites |
| Largest contentful paint | 5,504 ms | slow |
| Layout shift | 0.25 | some |
| Page weight | 1.1 MB | fair |
| Image weight | 569 KB | fair |
| Images | 7 | 7 larger than shown, 7 without width and height |
| Third-party domains | 1 | |
| 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: some AI signals.
How much the site looks AI-generated. It is a pattern match shown for interest, not a verdict.
Which signals fired
Signal Points AI CSS signals +10 AI palette signals +5 AI writing signals +5 AI stack signals +10 Default scaffold favicon +10 - Performance comes from one render on 10 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 10 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.