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Calculeaf

Calculeaf is an online engineering calculation worksheet for unit-aware math, calculation notes, plots, templates, and shareable technical work.

Developer Tools

Added May 5, 2026 · Last analysed May 5, 2026 · via · 80% unique tagline

Own this Launch?
Screenshot of Calculeaf

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 5 May 2026; the live site may have changed since.

Calculeaf has the basics covered well, with a thorough launch checklist and clean crawl signals. Worth fixing first: missing several security headers, incomplete legal pages, and tracking cookies set before any opt-in.

Launched on Product Hunt on May 5, 2026. The site is hosted on NTL in the United Kingdom, with a domain registered 1 week before launch. Our crawler found 6 technologies on this site, covering analytics, DNS providers, web fonts, and os. The stack includes Google Analytics, Google Fonts, and Google Search Console.

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

6.1
StackScope Score
Good
90/100 Launch Readiness
Launch ready
3/6 Security Headers
Decent
0/3 Legal
Missing
2/2 Crawl files
Complete
Vibe Score 0 · No 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 (6)

Infrastructure
DNS IONOS DNS
OS Ubuntu (2)
Server nginx (2)
Build & Framework
Font Google Fonts
Analytics & Marketing
Analytics Google Analytics (3)
SEO Google Search Console

Infrastructure

Network
NTL, GB
AS5089 · GB
DNS
IONOS DNS
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
SSL Certificate
Let's Encrypt
Valid 2 May 2026 to 31 Jul 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
2 months
Registered Apr 2026 · IONOS SE

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 (2)
NameLifetimeDetected as
_ga 1y Google Analytics
_ga_3613E3PQSL 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)

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 (1 URLs)
✗ security.txt
✗ llms.txt
✗ ads.txt
✗ humans.txt

Legal

? Privacy Policy not detected
? Terms of Service not detected
? Consent manager not detected
Analytics set tracking cookies on our visit, with no opt-in step.
Detection works best on English language sites.

Security Headers (3/6)

✓
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

307ms response time
Faster than 55% of sites
4 third-party domains loaded

Build

1 JS files
1 CSS files
4 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.