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CalcHub

Free online calculators and unit converters. Convert length, weight, temperature. Calculate BMI, age, tips and percentages instantly.

Added April 19, 2026 · Last analysed April 19, 2026 · via · 20% unique tagline (similar to CalcSmart24 )

Own this Launch?
Screenshot of CalcHub

StackScope is a free public catalogue of indie launches. We find launches on Product Hunt, Hacker News and similar feeds, then crawl each site to detect its tech stack and score it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 19 April 2026; the live site may have changed since.

CalcHub is missing several launch fundamentals. Main gaps: missing several security headers, incomplete legal pages, and no sitemap.

Launched on Product Hunt on April 19, 2026. The site is hosted on Vercel. Our crawler found 8 technologies on this site, covering AI builders, analytics, CSS frameworks, and developer tools. The stack includes Tailwind CSS, Google Analytics, and Google Search Console.

It's also on one of the most common stacks we track, shared by 2,461 launches.

If you own this site, refresh the snapshot and see the full fix list any time →

3.7
StackScope Score
Poor
76/100 Launch Readiness
Well prepared
1/6 Security Headers
Poor
0/3 Legal
Missing
1/2 Crawl files
Partial
Vibe Score 100 · Strong AI signals
How much the site looks AI-generated. Informational pattern-match signal, not a verdict. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (8)

Infrastructure
Hosting Vercel (2)
Security HSTS (2)
Build & Framework
CSS framework Tailwind CSS
Developer tools Vite
UI library shadcn/ui
Analytics & Marketing
Analytics Google Analytics (2)
SEO Google Search Console
AI & Emerging
AI builder Lovable

Infrastructure

Network
AMAZON-02 - Amazon.com, Inc., US
AS16509 · US
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
SSL Certificate
Google Trust Services
Valid 26 Feb 2026 to 27 May 2026
Certificate as captured in this snapshot, not a live check.

Email Security

✗
SPF Not published. Your domain can be spoofed in phishing emails.
?
DKIM Not detected at common selectors. Your provider may use a custom one.
✗
DMARC Not published. Receivers fall back to permissive defaults.
?
MTA-STS Not deployed. Mail to your domain can be downgraded to plaintext en route.
?
TLS-RPT Not configured. You won't hear about silent SMTP TLS handshake failures.

Readiness Breakdown How?

✓ Custom title and meta description
✓ Open Graph tags (title, image, description)
✓ Twitter card meta tags
✓ Responsive viewport meta tag
✓ Favicon present
- Canonical URL declared
- Semantic HTML (nav, main, article)

Vibe Score Breakdown How?

SignalPoints
AI palette signals +5
AI writing signals +3
AI code-structure signals +10
Recognised AI builder signature +100

This score is based on structural patterns and is not definitive. Many legitimate sites may trigger signals, and AI-built sites may go undetected. It should be treated as an indicator, not a verdict.

AI Stance

No AI stance declared
✗ llms.txt published
✓ No AI bots blocked in robots.txt
Content-Signal
? No directive declared
Link headers
? None advertised

Well-Known Files

✓ robots.txt
✗ sitemap.xml
✗ security.txt
✗ llms.txt
✗ ads.txt
✗ humans.txt

Legal

? 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.

Security Headers (1/6)

✗
Referrer-Policy
✗
X-Frame-Options
✗
Permissions-Policy experimental (check browser support)
✗
X-Content-Type-Options
✗
Content-Security-Policy
✓
Strict-Transport-Security
–
X-XSS-Protection deprecated (use Content-Security-Policy)

Performance

141ms response time
Faster than 84% of sites
3 third-party domains loaded

Build

✓ Code splitting
5 JS files
1 CSS files
3 Third-party domains
Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.