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

rf.gd

https://rf.gd· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

rf.gd

Sponsored

Hosting Provider

I Fastnet Ltd

IP Address

31.22.4.234

Server Location

🇬🇧 Newcastle upon Tyne, United Kingdom

ASN

AS34119

Organization

I Fastnet Ltd

Server

OpenResty

Nameservers

ns4.byet.org.ns2.byet.org.ns3.byet.org.ns5.byet.org.+3 more

Performance

Page Speed

2 KB

6 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

I Fastnet Ltd

Technology Stack

3 Technologies Detected

CSS Frameworks

Tailwind CSS

Fonts

Google Fonts

Web Servers

OpenResty

SEO Analysis

D52/100

rf.gdrf.gd

rf.gd is hosted by InfinityFree

No description available for this page.

Title Length31 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (1)

• Missing meta description - important for click-through rates

5 issues found

Upgrade to view details

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

65d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

24.01.2026

Valid Until

24.04.2026

Subject Alternative Names (2)

rf.gdwww.rf.gd

SHA-256 Fingerprint

85:70:D7:44:32:4E:4F:A4:FD:4A:E5:41:FE:98:6B:A5:B9:42:17:6D...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 500s(max-age=500, public, proxy-revalidate)

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Wed, 18 Feb 2026 00:08:20 GMT

expires

Wed, 18 Feb 2026 00:16:40 GMT

last-modified

Sun, 08 Feb 2026 09:32:16 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

sv62.ifastnet11.org

Domain Information

rf.gd

Domain Age

12y 5m

Created

25.08.2013

Expires

25.08.2026

Last Updated

20.11.2025

Registrar

Key Systems GmbH

DNSSEC

Not Enabled

Typography & Readability

Poppins + sans-serif

87/100

Readability

/30

40/40

20px · LH 1.50

Hierarchy

/20

21/25

2.8x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Poppins

Sans56px

Body Font

sans-serif

Sans20px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

56px

42px

24px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.8x larger than body text.

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

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

GGoogle Fonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Sponsored

Last analyzed: 18 Feb 2026 at 00:08

Historical Analysis & Change Tracking