Gravity

Show HN: Gravity – interactive solar-system simulator, from Newton to Einstein

qunabu.github.io · Added June 9, 2026 · Last analysed June 9, 2026 · via Hacker News · 50% 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 9 June 2026; the live site may have changed since.

Gravity still has work before launch. What needs work: missing several security headers, incomplete legal pages, and no robots.txt or sitemap.

Launched on Hacker News on June 9, 2026. The site is hosted on Fastly in the United States. The crawl picked up 4 technologies on this site, covering build tooling, CDN, web fonts, and hosting. The stack includes Vite, Fastly, and GitHub Pages.

For context, it's one of 59 launches on this exact stack.

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

0.8

StackScope Score

Poor

29/100 Launch Readiness

Needs work

0/6 Security Headers

Poor

0/3 Legal

Missing

0/2 Web Standards

Missing

78/100 Performance

Fast

Vibe Score 5 · Few AI signals

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

Tech Stack (4)

Infrastructure

CDN	Fastly
Hosting	GitHub Pages

Build & Framework

Build tool	Vite
Font	Google Fonts

Infrastructure

Network

FASTLY - Fastly, Inc., US

AS54113 · US

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

SSL Certificate

Let's Encrypt

Valid 6 Apr 2026 to 5 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 (0)

This site uses no client-side storage we could detect on page load.

Readiness Breakdown How?

⚠

Custom title and meta description (partial) missing meta description

✓ Responsive viewport meta tag

- Open Graph tags (title, image, description)

- Canonical URL declared

- Twitter card meta tags

- Favicon present

- Semantic HTML (nav, main, article)

Performance How?

32 ms Server response

100% Faster than peers

3248 ms Largest contentful paint

0.00 Cumulative layout shift

1.2 MB Page weight

453 KB Image 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	+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

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 not detected

? Terms of Service not detected

Detection works best on English language sites.

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

✗ HTML minified

✗ CSS minified

✗ JS minified

1 JS files

2 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.