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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nkj.ru

https://nkj.ru· First analyzed 25 Apr 2026· Updated 25 Apr 2026

Export

nkj.ru

Mobile

Sponsored

Hosting Provider

Hosting Services

IP Address

5.101.114.108

Site Location

🇷🇺 Russiavia tld

Server Location

🇪🇪 Jõhvi, Estonia

ASN

AS198068

Organization

Hosting Services

Server

Nginx

Nameservers

dns4.fastdns24.link.dns.fastdns24.com.dns2.fastdns24.org.dns3.fastdns24.eu.

Performance

Core Web Vitals

Weight

First Contentful Paint

774 ms10%

Speed Index

1.0 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

3 MB

165 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Hosting

Hosting Services

Technology Stack

8 Technologies Detected

CSS Frameworks

Analytics

Libraries

Advertising

Web Servers

Languages

SEO Analysis

C62/100

Meta Tags9/15

Content11/12

Headings1/8

Technical18/25

E-E-A-T3/7

Images4/7

Links5/5

URL5/5

Social0/5

Freshness2/4

Mobile1/4

Indexability3/3

nkj.runkj.ru

Наука и жизнь

Сайт журнала «Наука и жизнь»: наука, новости науки, российская наука, наука и образование. Архив журнала, форум, интернет-магазин.

Title Length13 chars

Recommended: 50-60 chars (~80px / 580px)

Description Length130 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag — every page should have exactly one H1

10 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

26 URLs

26 sub-sitemaps

robots.txt

42 rules

Sitemap reference found

Local SEO

Local Search Readiness

11/100

Poor

3 13 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D45/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

Citation

15/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:16%

Words:1,350

Token eff.:Optimal

Sections/1K:0.7

Structured Data

No Schema

Citation Readiness

Opening Summary10w

Descriptive Headingsavg 4w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (8)

AI readiness recommendation preview...

Upgrade to view recommendations

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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

57/100

Passed

Critical

Warnings

Images & Alt Text

15/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

9/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

10/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

14/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

0/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

5 recommendations

•Accessibility recommendation preview...

Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

20/100

385 mg

CO₂e / view

3.0 MB

Page Weight

30%

Cleaner Than

New Visitor

440 mg

Returning (cached)

220 mg

Annual (10K/mo)

46.2 kg

Emission Segments

Data Center

86 mg

Network

92 mg

Device

207 mg

Resource Breakdown

JavaScript

446.7 KB

Images

1.3 MB

CSS

1.2 MB

HTML

22.1 KB

Other

300 B

Green Hosting Not Verified

Hosting Services

7 recommendations

•Carbon footprint recommendation preview...

Upgrade to view recommendations

Security Score

41%Poor

Interactive

HTTPS

No WAF

72d

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

07.04.2026

Valid Until

06.07.2026

Subject Alternative Names (2)

nkj.ruwww.nkj.ru

SHA-256 Fingerprint

29:74:19:E7:31:89:F3:EB:4D:18:93:2F:EB:83:71:A6:D0:BC:FE:28...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

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

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Sat, 25 Apr 2026 17:39:30 GMT

expires

Thu, 19 Nov 1981 08:52:00 GMT

p3p

policyref="/bitrix/p3p.xml", CP="NON DSP COR CUR ADM DEV PSA...

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

emx.mail.ru

Domain Information

nkj.ru

Domain Age

21y 1m

Created

27.03.2005

Expires

27.03.2027

Registrar

RU-CENTER-RU

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

47/100

Not Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

Viewport

width=980

2 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

Noto Sans

WCAG Partial

56/100

Readability

/30

14/30

12px · LH 1.68

Hierarchy

/20

8/20

WCAG

/25

16/25

1:1 min contrast

Performance

/25

18/25

1 font · 3 req

Heading Font

Noto Sans

Sans

Body Font

Noto Sans

Sans12px

Contrast Ratio

1:1

12 issues

Reading Comfort

~42 CPL

Narrow lines

27px

19px

12px

❌ Critical: 12px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Partial contrast: 12 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Lean font stack: 1 font families keeps load times fast.

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

Buy on MyFonts

Color Palette

12 unique colors

12.43:1 AAA Light

#ffffff

Background· 28.099999999999998%

#383333

Text· 6.3%

#181d13

Primary· 14%

#30202a

Secondary· 4.7%

#e8e3da

Secondary· 2.8%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Advertising

TikTok PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)analytics.tiktok.com(3)st.top100.ru(2)googletagmanager.com(2)vk.com(1)

Website Identity

nkj.ru

mail@nkj.ru

21 years old

Location detected: 🇷🇺 Russiavia tld

RU-CENTER-RUru

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Last analyzed: 25 Apr 2026 at 17:39

Historical Analysis & Change Tracking