PenguinChess

Improve your chess with PenguinChess: tactics by theme, opening training, practical endgames vs. Stockfish, and free game analysis.

penguinchess.vercel.app · Added June 23, 2026 · Last analysed June 23, 2026 · via · 71% unique tagline

Own this Launch?

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

PenguinChess is partway there, with a thorough launch checklist and clean crawl signals. Visible gaps: missing several security headers, incomplete legal pages, and no email security records.

Launched on Product Hunt on June 23, 2026. The site is hosted on Amazon.com in the United States. The crawl picked up 6 technologies on this site, covering javascript library, analytics, developer tools, and hosting. The stack includes HSTS, i18next, and React Router.

For context, it's on one of the most common stacks we track, shared by 2,238 launches.

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

5.2

StackScope Score

Fair

90/100 Launch Readiness

Launch ready

1/6 Security Headers

Poor

0/3 Legal

Missing

2/2 Web Standards

Complete

100/100 Performance

Fast

Vibe Score 13 · Few AI signals

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

Tech Stack (6)

Infrastructure

Hosting	Vercel
Security	HSTS

Build & Framework

Developer tools	Vite
JavaScript library	i18next
JavaScript library	React Router

Analytics & Marketing

Analytics	Vercel Analytics medium

Infrastructure

Network

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

AS16509 · US

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

SSL Certificate

Google Trust Services

Valid 28 Apr 2026 to 27 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 (1)

Local storage (1)

Key	Size	Detected as
i18nextLng	2 B	i18next

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)

⚠

Page title is 68 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?

251 ms Server response

64% Faster than peers

520 ms Largest contentful paint

0.03 Cumulative layout shift

788 KB Page weight

1 KB Image weight

2 Third-party domains

0 Console errors

0 Failed requests

⚠ 3 images: 3 without width/height

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
Placeholder branding	+10
AI writing signals	+3

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 (19 URLs)

✗ security.txt

✗ llms.txt

✗ ads.txt

✗ humans.txt

Legal

? Privacy Policy not detected

? Terms of Service not detected

? Consent manager not detected

Analytics detected; tracking fires without visitor opt-in.

Detection works best on English language sites.

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)

Build

3 JS files

1 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.