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

habr.com

https://habr.com· First analyzed 11 Feb 2026· Updated 11 Feb 2026

Export

habr.com

Mobile

Sponsored

Hosting Provider

Habr LLC

IP Address

178.248.237.68

Server Location

🇷🇺 Moscow, Russia

ASN

AS51115

Organization

Habr LLC

Server

QRATOR

Nameservers

ns3.habradns.net.ns1.habradns.net.ns2.habradns.net.

Performance

Page Speed

310 KB

125 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Habr LLC

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

Analytics

CSS Frameworks

Fonts

SEO Analysis

D58/100

habr.comhabr.com

Publications / My feed / Habr

No description available for this page.

Title Length29 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Many images missing alt text (41/41)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

57 rules

Sponsored

Security Score

56%Poor

Interactive

HTTPS

No WAF

331d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

17.12.2025

Valid Until

08.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.habr.comhabr.com

SHA-256 Fingerprint

21:E5:AF:DD:DF:DD:02:8E:44:CF:44:70:6C:E8:4E:F4:20:8D:07:9C...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Wed, 11 Feb 2026 13:38:55 GMT

etag

W/"3efae-vmKKmACz10cKc7Far40gsUOtu8M"

server

QRATOR

strict-transport-security

max-age=31536000; includeSubDomains

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mxs.habramail.net

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

-apple-system

85/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

15/25

1.24x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

-apple-system

Sans20px

Body Font

-apple-system

Sans16px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

20px

24px

16px

Minor Third

Scale

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

GGoogle Fonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

18 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets.habr.com(3)cdn-c.skcrtxr.com(2)ad-pixel.ru(1)mc.yandex.ru(1)unpkg.com(1)

Website Identity

Facebook X (Twitter)GitHub Telegram

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Last analyzed: 11 Feb 2026 at 13:39

Historical Analysis & Change Tracking