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Free Online Calculators 2026

Instant, accurate, and completely free online calculators for finance, health, math, and everyday use. No signup required. Built for the USA.

United States Estimated origin: United States

Added June 2, 2026 · Last analysed June 2, 2026 · via

Own this Launch?
Screenshot of Free Online Calculators 2026

StackScope records what new websites are built with, the week they launch. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We crawled this one for its tech stack and scored it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 2 June 2026; the live site may have changed since.

Every technology below links to its own page: which other new sites launched with it. Vendors and agencies watch those pages with Stackdar and hear about new adopters the week they ship, from £15 a month.

Free Online Calculators 2026 ships with the launch fundamentals in place, with complete legal pages, a thorough launch checklist, and fast page loads. What needs work: missing several security headers and incomplete email security.

Launched on Product Hunt on June 2, 2026. The site is hosted on Hostinger, with a domain registered 2 weeks before launch. We've detected 7 technologies on this site, covering DNS providers, business email, web fonts, and hosting. The stack includes Google Fonts, Hostinger, and Hostinger DNS.

It's running the same core stack as 1,289 other launches.

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

8.1
StackScope Score
Excellent
100/100 Launch Readiness
Launch ready
2/6 Security Headers
Weak
3/3 Legal
Complete
2/2 Crawl files
Complete
Vibe Score 10 · 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 (7)

Infrastructure
DNS Hostinger DNS
Hosting Hostinger (2)
Protocol HTTP/3
Security HSTS
Server LiteSpeed Web Server
Email
Business email Hostinger Email
Build & Framework
Font Google Fonts

Infrastructure

Network
AS-HOSTINGER - Hostinger International Limited, CY
AS47583 · UA
DNS
Hostinger 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 12 May 2026 to 10 Aug 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
3 months
Registered May 2026 · HOSTINGER operations, UAB

Email Security

✓
SPF ~all Soft-fail (~all). Common and accepted.
?
DKIM Not detected at common selectors. Your provider may use a custom one.
✗
DMARC p=none None (p=none). Monitoring only.
?
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 67 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 168 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.

Vibe Score Breakdown How?

SignalPoints
AI palette signals +5
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

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 (24 URLs)
✗ security.txt
✓ llms.txt
✗ ads.txt
✗ humans.txt

Legal

✓ Privacy Policy
/privacy-policy/
✓ Terms of Service
/terms-and-conditions/
86% unique
Mentions:
GDPR CCPA Cookies Do Not Sell Updated: May 13, 2026

Security Headers (2/6)

✗
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

100ms response time
Faster than 81% of sites
3 third-party domains loaded

Build

0 JS files
2 CSS files
3 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.