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.

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astro.com

https://astro.com· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

astro.com

Sponsored

Hosting Provider

Astrodienst AG

IP Address

192.53.104.242

Server Location

🇨🇭 Zollikon, Switzerland

ASN

AS3303

Organization

Astrodienst AG

Server

Apache

Nameservers

ns1.ip-plus.net.pns52.cloudns.net.pns51.cloudns.net.as80.astro.ch.

Performance

Page Speed

3.2 MB

90 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚙️ SSR

Frontend

Framework

Astro

Styling

Bootstrap

Infrastructure

Hosting

Astrodienst AG

Progressive Web App

Web Manifest

Technology Stack

9 Technologies Detected

Libraries

CSS Frameworks

Analytics

Meta Frameworks

Icon Libraries

Web Servers

SEO Analysis

B76/100

astro.comastro.com

Astrodienst - The World's Best Horoscopes

Astro.com - free Astrology and Horoscopes from Astrodienst! Get your free horoscope - and much more! Astrodienst provides the world's best astrology site for...

Description truncated.

Title Length41 chars

Recommended: 50-60 chars

Description Length241 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

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Crawlability

Sitemap

Type: index

18 URLs

robots.txt

110 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

162d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

01.07.2025

Valid Until

01.08.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.astro.comastro.com

SHA-256 Fingerprint

F3:E9:B2:F6:07:03:F4:15:FF:B8:C9:C5:29:46:E9:56:61:5F:F7:C3...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, must-revalidate)

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

27897

content-type

text/html; charset=UTF-8

date

Fri, 20 Feb 2026 00:20:01 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

as80.astro.ch

Domain Information

astro.com

Domain Age

29 years

Created

19.02.1997

Expires

20.02.2031

Last Updated

19.04.2021

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

heading-bold + Open Sans

76/100

Readability

/30

40/40

20px · LH 1.50

Hierarchy

/20

18/25

2.24x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

heading-bold

Sans45px

Body Font

Open Sans

Sans20px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

45px

37px

23px

21px

20px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x larger than body text.

✅ Protected text on images: Using text-shadow for readability.

⚠️ Cramped layout: 30 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(12)google-analytics.com(1)googletagmanager.com(1)

Website Identity

Facebook X (Twitter)

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Last analyzed: 20 Feb 2026 at 00:20

Historical Analysis & Change Tracking