New: The State of Indie Launches: June 2026. Who adopts a piece of infrastructure tells you how new it is. Read

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FreeConcreteCalc

Free concrete calculator for slabs, footings, post holes, walls, columns & stairs. Calculate cubic yards, 60lb & 80lb bag counts, and project cost — works like Quikrete and Sakrete calculators but with more features.

United States Estimated origin: United States

Added July 7, 2026 · Last analysed July 7, 2026 · via · 71% unique tagline

Own this Launch?
Screenshot of FreeConcreteCalc

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

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

Launched on Product Hunt on July 7, 2026. The site is served through Cloudflare, with a domain registered 1 week before launch. We've detected 10 technologies on this site, covering analytics, captcha, CDN, and CSS frameworks. The stack includes Astro, Tailwind CSS, and Cloudflare.

It's on one of the most common stacks we track, shared by 386 launches 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
100/100 Performance
Fast
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 (10)

Infrastructure
CDN Cloudflare
DNS Cloudflare DNS
Security HSTS
Email
Email forwarding Cloudflare Email Routing (2)
Build & Framework
Captcha Cloudflare Turnstile
CSS framework Tailwind CSS
Meta-framework Astro
Analytics & Marketing
Analytics Google Analytics (3)
SEO Google Search Console
Tag management Google Tag Manager medium

Infrastructure

Network
CLOUDFLARENET - Cloudflare, Inc., US
AS13335 · US
DNS
Cloudflare DNS
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
Green hosting
Green hosted
Host runs on renewable energy. Data from The Green Web Foundation.
SSL Certificate
Google Trust Services
Valid 25 Jun 2026 to 23 Sep 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
12 days
Registered Jun 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 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 66 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 216 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?

162 ms Server response
79% Faster than peers
612 ms Largest contentful paint
0.00 Cumulative layout shift
239 KB Page 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
AI writing signals +5
AI code-structure signals +20
AI asset signals +10
Implausible social-proof claim +15

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
✗ 9 AI bots blocked in robots.txt
Content-Signal
✗ ai-train = no
✓ search = yes
? ai-input (not declared)
Link headers
? None advertised

Well-Known Files

✓ robots.txt
✓ sitemap.xml (1 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:
Cookies Updated: June 20, 2026

Security Headers (6/6)

✓
Referrer-Policy
✓
X-Frame-Options
✓
Permissions-Policy experimental (check browser support)
✓
X-Content-Type-Options
✓
Content-Security-Policy ⚠ CSP violation detected: your policy is blocking 1 of your own resource
✓
Strict-Transport-Security
–
X-XSS-Protection deprecated (use Content-Security-Policy)

Build

3 JS files
1 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.