Free Safe Zone Checker & HTML5 Validator
Instantly preview UI overlay danger zones for TikTok, Instagram Reels, YouTube Shorts, Snapchat and TV Broadcast. Check exact pixel-safe areas for 9:16, 16:9 and 4:5 formats. Free, 100% private — your file never leaves your browser.
Added April 15, 2026
· Last analysed April 15, 2026 · via 
· 78% unique tagline
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 15 April 2026; the live site may have changed since.
Free Safe Zone Checker & HTML5 Validator ships with the basics, with a thorough launch checklist and clean crawl signals. Visible gaps: missing several security headers, incomplete legal pages, and tracking cookies set before any opt-in.
Launched on Product Hunt on April 15, 2026. The site is hosted on Vercel and served through Cloudflare, with a domain registered 2 weeks before launch. We've detected 12 technologies on this site, covering analytics, CDN, DNS providers, and email forwarding. The stack includes Cloudflare, Google Analytics, and Google Fonts.
It's on one of the most common stacks we track, shared by 2,956 launches.
If you own this site, refresh the snapshot and see the full fix list any time →
Tech Stack (12)
| CDN |
Cloudflare
|
| DNS |
Namecheap DNS
|
| Hosting |
Vercel
(2)
|
| Security | HSTS (2) |
| Email forwarding |
Namecheap Email Forwarding
(2)
|
| Font |
Google Fonts
|
| Package CDN |
unpkg
|
| UI library |
Lucide Icons
|
| Analytics |
Google Analytics
(2)
|
| SEO |
Google Search Console
|
| Monetisation |
Ko-fi
(2)
|
| Error tracking |
Sentry
|
Infrastructure
Email Security
Readiness Breakdown How?
Vibe Score Breakdown How?
| Signal | Points |
|---|---|
| AI writing signals | +5 |
| AI CSS 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.