← Back to browse

CalcHub

57 free calculators for finance, health, math, science, and education fast answers, no sign-up, with your history and favorites saved automatically.

Added August 22, 2026 · Last analysed August 22, 2026 · via

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 22 August 2026; the live site may have changed since.

CalcHub is largely in shape, with a thorough launch checklist, fast page loads, and clean crawl signals. Visible gaps: missing Content-Security-Policy and Strict-Transport-Security, incomplete legal pages, and no email security records.

Launched on Product Hunt on August 22, 2026. The site is served through Cloudflare. The crawl picked up 4 technologies on this site, covering analytics, CDN, DNS providers, and web fonts. The stack includes Cloudflare, Cloudflare DNS, and Cloudflare Web Analytics.

For context, it's more locked down than the typical Product Hunt launch.

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

7.8
StackScope Score
Good
90/100 Launch Readiness
Launch ready
4/6 Security Headers
Decent
2/3 Legal
Partial
2/2 Crawl files
Complete
100/100 Performance
Fast
Vibe Score 5 · Few 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 (4)

Infrastructure
CDN Cloudflare
DNS Cloudflare DNS
Build & Framework
Font Google Fonts
Analytics & Marketing
Analytics Cloudflare Web Analytics (2)

Infrastructure

Network
CLOUDFLARENET - Cloudflare, Inc., US
AS13335 · US
DNS
Cloudflare DNS
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
Green hosting
Green hosted
Host runs on renewable energy. Data from The Green Web Foundation.
SSL Certificate
Google Trust Services
Valid 12 Jul 2026 to 10 Oct 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.

Storage (0)

This site uses no client-side storage we could detect on page load.

Readiness Breakdown How?

✓ Custom title and meta description
⚠
Open Graph tags (title, image, description) (partial) missing og:image
✓ Twitter card meta tags
✓ Canonical URL declared
✓ Responsive viewport meta tag
✓ Favicon present
✓ Semantic HTML (nav, main, article)
⚠
Page title is 83 characters (advisory) Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible.
⚠
Meta description is 173 characters (advisory) Google only shows about 155–160 characters of the description in desktop search results (less on mobile); anything past that won't appear.

Performance How?

126 ms Server response
81% Faster than peers
532 ms Largest contentful paint
0.01 Cumulative layout shift
872 KB Page weight
474 KB Image weight
4 Third-party domains
0 Console errors
0 Failed requests

⚠ 1 images: 1 oversized, 1 without width/height

Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.

Vibe Score Breakdown How?

SignalPoints
AI writing signals +5

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 (59 URLs)
✗ security.txt
✗ llms.txt
✗ ads.txt
✗ humans.txt

Legal

✓ Privacy Policy
/privacy-policy.html
? Terms of Service not detected
? Analytics present, but it set no tracking cookies on our visit (it may be opt-in-gated).
90% unique
Mentions:
Cookies Updated: July 25, 2026

Security Headers (4/6)

✓
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)

Build

2 JS files
2 CSS files
4 Third-party domains

Brand Colours

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.