What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

rthk.hk

https://rthk.hk· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

rthk.hk

Sponsored

Hosting Provider

Nexus Guard Limited

IP Address

27.126.236.160

Server Location

🇭🇰 Tsuen Wan, Hong Kong

ASN

AS45474

Organization

Nexus Guard Limited

Server

2.0.0

Nameservers

ns02.scig.gov.hk.ns01.scig.gov.hk.

Performance

Page Speed

929 KB

155 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Nexus Guard Limited

Technology Stack

7 Technologies Detected

Libraries

Other

CSS Frameworks

Fonts

Analytics

Customer Support

SEO Analysis

C61/100

rthk.hkrthk.hk

香港電台網站

No description available for this page.

Title Length6 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

25 rules

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

119d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hongkong Post

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

02.06.2025

Valid Until

20.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.rthk.hkrthk.hk

SHA-256 Fingerprint

62:60:52:83:EC:43:30:74:8B:E3:CA:30:E8:74:DE:75:E0:AB:01:F2...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

cache-control

🔴 No Cache(no-store, no-cache, must-revalidate)

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Fri, 20 Feb 2026 08:29:04 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (2)

ga2.rthk.hk

ga1.rthk.hk

Domain Information

rthk.hk

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

ProximaNova_Light

64/100

Readability

/30

32/40

16px · LH 1.38

Hierarchy

/20

11/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

ProximaNova_Light

Sans0

Body Font

ProximaNova_Light

Sans16px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

16px

24px

18px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Good performance: Using 2 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 97 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Matomo (Piwik)Mid-Market

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

webstatic.rthk.hk(12)rthk.hk(4)ssl.p.jwpcdn.com(1)d1dns4zpgsd7rz.cloudfront.net(1)cdn.matomo.cloud(1)

Website Identity

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 20 Feb 2026 at 08:29

Historical Analysis & Change Tracking