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Calc Labz

Free online calculators for EMI, SIP, GST, BMI, income tax and 300+ more. Instant results, no signup. Works offline.

Productivity
India Estimated origin: India

Added April 27, 2026 · Last analysed April 27, 2026 · via · 67% unique tagline

Own this Launch?
Screenshot of Calc Labz

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 27 April 2026; the live site may have changed since.

Calc Labz scores highly overall, with complete legal pages, a complete set of security headers, and a thorough launch checklist. Main gaps: incomplete email security.

Launched on Product Hunt on April 27, 2026. The site is hosted on Vercel, with a domain registered 3 weeks before launch. The crawl picked up 15 technologies on this site, covering package cdn, advertising, analytics, and DNS providers. The stack includes Svelte, cdnjs, and Font Awesome.

For context, it's one of just 16 launches we've crawled on this exact stack and 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 →

10.0
StackScope Score
Excellent
100/100 Launch Readiness
Launch ready
6/6 Security Headers
Strong
3/3 Legal
Complete
2/2 Crawl files
Complete
Vibe Score 50 · Many 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 (15) · Indie stack

Infrastructure
DNS Namecheap DNS
Hosting Vercel (2)
Security HSTS (2)
Email
Business email Zoho Mail (2)
Build & Framework
Font Google Fonts
Framework Svelte
Icon font Font Awesome
Package CDN cdnjs
jsDelivr
Analytics & Marketing
Advertising Google Ads
Analytics Google Analytics (2)
SEO Google Search Console
Social Google Search
Tag management Google Tag Manager
Business Tools
SaaS Zoho

Infrastructure

Network
AMAZON-02 - Amazon.com, Inc., US
AS16509 · US
DNS
Namecheap DNS
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
SSL Certificate
Let's Encrypt
Valid 4 Apr 2026 to 3 Jul 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
3 months
Registered Apr 2026 · NameCheap, Inc.

Email Security

✓
SPF ~all Soft-fail (~all). Common and accepted.
?
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)
✓ Twitter card meta tags
✓ Canonical URL declared
✓ Responsive viewport meta tag
✓ Favicon present
✓ Semantic HTML (nav, main, article)
⚠
Page title is 72 characters (advisory) Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible.

Vibe Score Breakdown How?

SignalPoints
AI CSS signals +15
AI palette signals +5
AI writing signals +5
AI code-structure 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 (3 URLs)
✗ security.txt
✗ llms.txt
✓ ads.txt
✗ humans.txt

Legal

✓ Privacy Policy
/privacy
✓ Terms of Service
/terms
? Analytics present, but it set no tracking cookies on our visit (it may be opt-in-gated).
92% unique
Mentions:
GDPR CCPA Cookies

Security Headers (6/6)

✓
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

427ms response time
Faster than 42% of sites
5 third-party domains loaded

Build

✓ Code splitting
11 JS files
6 CSS files
5 Third-party domains

Brand Colours

App Manifest

Calc Labz — 300+ Free Calculators
display: standalone 2 icons
theme #6366f1
finance utilities education
Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.