4K Video YouDownSet

一键下载4K/8K超高清视频、音乐、双语字幕，支持YouTube、Bilibili、TikTok等100+平台，多线程引擎极速下载。

ai-dtool.com · Added June 9, 2026 · Last analysed June 9, 2026 · via · 25% unique tagline (similar to YT1s: YouTube video downloader)

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

4K Video YouDownSet covers some of the launch checklist, with a thorough launch checklist. Visible gaps: missing several security headers, incomplete legal pages, and no robots.txt or sitemap.

Launched on Product Hunt on June 9, 2026. The site is hosted on Hangzhou Alibaba Advertising Co. in China, with a domain registered 11 months before launch. Our crawler found 3 technologies on this site, covering DNS providers, business email, and servers. The stack includes Alibaba Cloud, nginx, and QQ Mail.

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

4.3

StackScope Score

Fair

100/100 Launch Readiness

Launch ready

3/6 Security Headers

Decent

0/3 Legal

Missing

0/2 Web Standards

Missing

Vibe Score 40 · Some AI signals

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

Tech Stack (3)

Infrastructure

DNS	Alibaba Cloud
Server	nginx

Business email	QQ Mail (2)

Infrastructure

Network

ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN

AS37963 · CN

DNS

Alibaba Cloud

Authoritative nameserver

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

SSL Certificate

Let's Encrypt

Valid 10 May 2026 to 8 Aug 2026

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

Domain Age

11 months

Registered Jun 2025 · Alibaba Cloud Computing Ltd. d/b/a HiChina (www.net.cn)

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?

✓ Custom title and meta description

✓ Open Graph tags (title, image, description)

✓ Twitter card meta tags

✓ Canonical URL declared

✓ Responsive viewport meta tag

✓ Favicon present

✓ Semantic HTML (nav, main, article)

Vibe Score Breakdown How?

Signal	Points
AI CSS signals	+10
AI palette signals	+5
AI code-structure 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 (3/6)

✓

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

2265ms response time

Faster than 2% of sites

2 third-party domains loaded

Build

✗ HTML minified

✗ CSS minified

✗ JS minified

2 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.