Vast Calculators

Use Vast Calculators' free online calculators for finance, health, education, math, sports, and construction. Instant, accurate results with clear formulas and worked examples.

Added July 18, 2026 · Last analysed July 18, 2026 · via

Own this Launch?

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 18 July 2026; the live site may have changed since.

Vast Calculators looks production-ready overall, with complete legal pages, a thorough launch checklist, and clean crawl signals. Main gaps: missing several security headers and no email security records.

Launched on Product Hunt on July 18, 2026. The site is hosted on Vercel, with a domain registered 8 months before launch. We've detected 15 technologies on this site, covering advertising, analytics, ui library, and consent tooling. The stack includes Google Funding Choices, Next.js, and React.

It's on one of the most common stacks we track, shared by 10,662 launches.

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

7.3

StackScope Score

Good

90/100 Launch Readiness

Launch ready

1/6 Security Headers

Poor

3/3 Legal

Complete

2/2 Crawl files

Complete

86/100 Performance

Fast

Vibe Score 28 · Some 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)

Infrastructure

DNS	Vercel DNS
Hosting	Vercel
Security	HSTS

Build & Framework

CSS framework	Tailwind CSS
Framework	React
Meta-framework	Next.js (5)
UI library	Lucide Icons
UI library	shadcn/ui

Analytics & Marketing

Advertising	Google Ads
Advertising	Google AdSense (2)
Analytics	Google Analytics (4)
Analytics	Vercel Analytics medium
Consent	Google Funding Choices
SEO	Google Search Console
Tag management	Google Tag Manager medium

Infrastructure

Network

AMAZON-02 - Amazon.com, Inc., US

AS16509 · US

DNS

Vercel DNS

Authoritative nameserver

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

Green hosting

Not green hosted

No green-energy record. Data from The Green Web Foundation.

SSL Certificate

Let's Encrypt

Valid 11 Jul 2026 to 9 Oct 2026

Certificate as captured in this snapshot, not a live check.

Domain Age

8 months

Registered Oct 2025 · NameCheap, Inc.

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 (3)

Cookies (3)

Name	Lifetime	Detected as
FCCDCF	1y	-
_ga	1y	Google Analytics
_ga_NNPB9C2TM5	1y	Google Analytics

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 62 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 176 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?

873 ms Server response

14% Faster than peers

464 ms Largest contentful paint

0.03 Cumulative layout shift

2.5 MB Page weight

25 KB Image weight

5 Third-party domains

0 Console errors

0 Failed requests

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?

Signal	Points
AI CSS signals	+10
AI palette signals	+5
AI writing signals	+3
AI stack signals	+10

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

Welcomes AI crawlers

✓ 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 (183 URLs)

✗ security.txt

✓ llms.txt

✓ ads.txt

✗ humans.txt

Legal

✓ Privacy Policy

/privacy-policy

✓ Terms of Service

/terms-of-service

✓ Consent manager: Google Funding Choices

80% unique

Mentions:

GDPR CCPA Cookies Do Not Sell

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)

Build

✓ Code splitting

16 JS files

1 CSS files

5 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.