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Calculator Pro

Access 3736+ free online calculators for math, finance, health, science, and everyday life. Fast, accurate, and easy to use.

calculatorpro.org · Added June 12, 2026 · Last analysed June 12, 2026 · via · 57% unique tagline

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 12 June 2026; the live site may have changed since.

Calculator Pro ships with the launch fundamentals in place, with complete legal pages, a complete set of security headers, and a thorough launch checklist. What needs work: analytics without a consent banner and no email security records.

Launched on Product Hunt on June 12, 2026. The site is hosted on Hostinger International Limited in Germany. The crawl picked up 9 technologies on this site, covering analytics, baas, CSS frameworks, and frameworks. The stack includes React, Tailwind CSS, and Firebase.

For context, it's running the same core stack as 173 other launches and tighter on security headers than most Product Hunt launches.

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
3/3* Legal
Complete*
2/2 Web Standards
Complete
Vibe Score 20 · Few AI signals
Informational pattern-match signal. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (9)

Infrastructure
Security HSTS
Server nginx
Build & Framework
BaaS Firebase
CSS framework Tailwind CSS
Framework React
UI library shadcn/ui
Analytics & Marketing
Analytics Google Analytics (2)
SEO Google Search Console
Tag management Google Tag Manager (2)

Infrastructure

DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
SSL Certificate
Let's Encrypt
Valid 15 Apr 2026 to 14 Jul 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 (5)

Local storage (4)
KeySizeDetected as
calculatorpro_admin_settings 6.7 KB -
calculatorpro_analytics_visitor_id 32 B -
calculatorpro_favorites 2 B -
calculatorpro_recent 2 B -
Session storage (1)
KeySizeDetected as
calculatorpro_analytics_session_id 32 B -

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 77 characters (advisory) Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible.

Performance How?

493 ms Server response
37% Faster than peers
1148 ms Largest contentful paint
0.01 Cumulative layout shift
603 KB Page weight
41 KB Image weight
3 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?

SignalPoints
Placeholder branding +10
AI palette signals +5
AI iconography 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

Blocks AI crawlers
llms.txt published
5 AI bots blocked in robots.txt
? No directive declared
? None advertised

Well-Known Files

sitemap.xml (10 URLs)
security.txt
llms.txt
ads.txt
humans.txt
? Consent manager not detected
Analytics detected; tracking fires without visitor opt-in.
86% unique

Security Headers (6/6)

Permissions-Policy experimental (check browser support)
X-XSS-Protection deprecated (use Content-Security-Policy)

Build

HTML minified
CSS minified
JS minified
Code splitting
12 JS files
1 CSS files
3 Third-party domains

Brand Colours

App Manifest

Calculator Pro - Free Online Calculators
display: standalone 10 icons
theme #10b981
utilities education productivity
Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.