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Flipbook

Turn videos, documents, and browser sessions into fast static flipbooks. One-click publishing to Cloudflare Pages.

Developer Tools

Added April 20, 2026 · Last analysed April 20, 2026 · via Hacker News · 62% unique tagline

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Screenshot of Flipbook

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 20 April 2026; the live site may have changed since.

Flipbook covers some of the launch checklist, with a thorough launch checklist, fast page loads, and clean crawl signals. Main gaps: missing several security headers, incomplete legal pages, and incomplete email security.

Launched on Hacker News on April 20, 2026. The site is served through Cloudflare. Our crawler found 3 technologies on this site, covering CDN, DNS providers, and protocol. The stack includes Cloudflare, Cloudflare DNS, and HTTP/3.

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

5.8
StackScope Score
Fair
94/100 Launch Readiness
Launch ready
2/6 Security Headers
Weak
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 (3)

Infrastructure
CDN Cloudflare (3)
DNS Cloudflare DNS
Protocol HTTP/3 (2)

Infrastructure

Network
CLOUDFLARENET - Cloudflare, Inc., US
AS13335 · US
DNS
Cloudflare DNS
Authoritative nameserver
DNSSEC
Enabled
DNSKEY records published. DNS responses signed.
SSL Certificate
Google Trust Services
Valid 19 Apr 2026 to 18 Jul 2026
Certificate as captured in this snapshot, not a live check.

Email Security

✓
SPF ~all (via apex browserbox.io) Soft-fail (~all). Common and accepted.
✓
DKIM (via apex browserbox.io) Detected on apex browserbox.io
✗
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.

Readiness Breakdown How?

✓ Custom title and meta description
✓ Open Graph tags (title, image, description)
✓ Canonical URL declared
✓ Responsive viewport meta tag
✓ Favicon present
✓ Semantic HTML (nav, main, article)
- Twitter card meta tags

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
Detection works best on English language sites.

Security Headers (2/6)

✓
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

108ms response time
Faster than 92% of sites
12 third-party domains loaded

Build

1 JS files
1 CSS files
12 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.