CalcHub
CalcHub — 318+ free calculators. Finance, Math, Physics, Chemistry, Health, Engineering. Fast & works on any device.
Added 10 Nov 2026
Analysed 10 Nov 2026
via 
What we found
- We found no privacy policy or terms of service.
- There are no SPF or DMARC records, so anyone can send email that claims to come from this domain.
- It sends one of the six security headers we check; Content-Security-Policy is among those missing.
- The site is hosted on Vercel.
- Two more gaps are listed further down the page.
Built with: 5 technologies
| Technology | Type |
|---|---|
| Infrastructure | |
Vercel
|
Hosting |
| HSTS | Security |
| Build & Framework | |
Google Fonts
|
Font |
Chart.js
medium
|
JavaScript library |
cdnjs
|
Package CDN |
Each technology links to its own page: which other new sites launched with it.
Site checks
| Custom title and meta description | |
| Responsive viewport meta tag | |
| Semantic HTML (nav, main, article) | |
| Open Graph tags (title, image, description) | |
| Canonical URL declared | |
| Twitter card meta tags | |
| Favicon present |
| 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 | |
| Detection works best on English-language sites |
| robots.txt | |
| sitemap.xml | |
| 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 | Not published | |
| DKIM | Not found at common selectors | |
| MTA-STS | Not deployed | |
| TLS-RPT | Not configured |
Without SPF and DMARC, anyone can send email that claims to come from this domain. Those two are the records to add first.
Hosting and network
| Network | AMAZON-02 - Amazon.com, Inc., US AS16509, US |
|---|---|
| DNSSEC | Not enabled DNS answers are unsigned |
| Certificate | Google Trust Services valid 31 Oct 2026 to 29 Jan 2027, as captured |
| Green hosting | No record per The Green Web Foundation |
| Page build | 3 JS files, 1 CSS file 2 third-party domains |
| Brand colours |
Storage: 2 items
| Key | Size | Set by |
|---|---|---|
| ch_notifs | 2 B | - |
| seen_notif_ids | 2 B | - |
Performance
| Measure | This site | Reading |
|---|---|---|
| Server response | 519 ms | fair, faster than 27% of sites |
| Largest contentful paint | 600 ms | good |
| Layout shift | 0.35 | a lot |
| Page weight | 1.0 MB | fair |
| Third-party domains | 2 | |
| Console errors | 2 | worth a look |
| Failed requests | 1 | worth fixing |
Broken requests to the site itself (1), worth fixing
- 404 /cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js
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: strong 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 copy signals +5 AI onboarding signals +5 AI palette signals +5 AI writing signals +5 AI iconography signals +5 AI code-structure signals +5 Recognised AI builder signature +30 AI layout signals +5 AI CSS signals +15 - 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.