Free Online Calculators

No downloads, no sign-ups. Financial planning, health tracking, math helpers, and unit converters — all free, all in your browser.

Finance

Estimated origin: China

Added July 9, 2026 · Last analysed July 9, 2026 · via · 60% unique tagline

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

Free Online Calculators is early-stage. Main gaps: missing several security headers, incomplete legal pages, and no robots.txt.

Launched on Product Hunt on July 9, 2026. The site is hosted on GitHub Pages and served through Fastly, with a domain registered the day of launch. We've detected 7 technologies on this site, covering advertising, CDN, consent tooling, and DNS providers. The stack includes Google Funding Choices, Alibaba Cloud, and Fastly.

It's on one of the most common stacks we track, shared by 1,593 launches.

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

3.4

StackScope Score

Poor

41/100 Launch Readiness

Partially ready

0/6 Security Headers

Poor

2/3 Legal

Partial

1/2 Crawl files

Partial

93/100 Performance

Fast

Vibe Score 6 · 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

CDN	Fastly
DNS	Alibaba Cloud
Hosting	GitHub Pages

Analytics & Marketing

Advertising	Google Ads
Advertising	Google AdSense (2)
Consent	Google Funding Choices
SEO	Google Search Console

Infrastructure

Network

FASTLY - Fastly, Inc., US

AS54113 · US

DNS

Alibaba Cloud

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 9 Jul 2026 to 7 Oct 2026

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

Domain Age

1 day

Registered Jul 2026 · Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn)

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 (2)

Cookies (1)

Name	Lifetime	Detected as
FCCDCF	1y	Google Funding Choices

Local storage (1)

Key	Size	Detected as
calc_site_pageviews	119 B	-

Readiness Breakdown How?

⚠

Custom title and meta description (partial) missing custom <title>

✓ Responsive viewport meta tag

✓ Semantic HTML (nav, main, article)

- Open Graph tags (title, image, description)

- Canonical URL declared

- Twitter card meta tags

- Favicon present

Performance How?

1002 ms Server response

11% Faster than peers

556 ms Largest contentful paint

0.00 Cumulative layout shift

516 KB Page weight

2 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 writing signals	+3
AI iconography signals	+3

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 (19 URLs)

✗ security.txt

✗ llms.txt

✗ ads.txt

✗ humans.txt

Legal

✓ Privacy Policy

/privacy.html

? Terms of Service not detected

✓ Consent manager: Google Funding Choices

84% unique

Mentions:

Cookies Updated: July 9, 2026

Security Headers (0/6)

✗

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

6 JS files

1 CSS files

2 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.