Splitsizer

Free mini split BTU calculator. Five inputs (square footage, climate, insulation, sun, ceiling) return a practical sizing range snapped to standard system classes — brand-neutral, no email required.

splitsizer.com · Added June 3, 2026 · Last analysed June 3, 2026 · via Hacker News · 75% unique tagline

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

Splitsizer ships with the basics, with a thorough launch checklist and fast page loads. What needs work: missing several security headers, incomplete legal pages, and no sitemap.

Launched on Hacker News on June 3, 2026. The site is hosted on Amazon.com in the United States, with a domain registered 2 weeks before launch. We've detected 7 technologies on this site, covering CSS frameworks, DNS providers, business email, and web fonts. The stack includes Tailwind CSS, Cloudflare DNS, and Cloudflare Email Routing.

It's running the same core stack as 239 other launches.

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

5.6

StackScope Score

Fair

100/100 Launch Readiness

Launch ready

1/6 Security Headers

Poor

2/3 Legal

Partial

1/2 Web Standards

Partial

100/100 Performance

Fast

Vibe Score 40 · Some AI signals

Informational pattern-match signal. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (7)

Infrastructure

DNS	Cloudflare DNS
Hosting	Vercel
Security	HSTS

Business email	Cloudflare Email Routing

Build & Framework

CSS framework	Tailwind CSS
Font	Google Fonts

Analytics & Marketing

SEO	Google Search Console

Infrastructure

Network

AMAZON-02 - Amazon.com, Inc., US

AS16509 · US

DNS

Cloudflare DNS

Authoritative nameserver

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

SSL Certificate

Let's Encrypt

Valid 13 May 2026 to 11 Aug 2026

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

Domain Age

21 days

Registered May 2026 · Cloudflare, Inc.

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?

✓ Favicon present

✓ Open Graph tags (title, image, description)

✓ Canonical URL declared

✓ Responsive viewport meta tag

✓ Custom title and meta description

✓ Twitter card meta tags

✓ Semantic HTML (nav, main, article)

⚠

Page title is 61 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 198 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?

Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.

✓

Server response57 ms

✓

Page weight726 KB

✓

Largest contentful paint392 ms

✓

Cumulative layout shift0.02

Vibe Score Breakdown How?

Signal	Points
AI writing signals	+5
AI code-structure signals	+20
AI typography signals	+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

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

✗ security.txt

✗ llms.txt

✗ ads.txt

✗ humans.txt

Legal

✓ Privacy Policy

? Terms of Service not detected

88% unique

Mentions:

Cookies DPO Updated: May 19, 2026

Security Headers (1/6)

✗

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

57ms response time

Faster than 99% of sites

3 third-party domains loaded

Build

✓ HTML minified

2 JS files

3 Third-party domains

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.