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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klerk.ru

https://klerk.ru· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

klerk.ru

Sponsored

Hosting Provider

Datahouse FOLGA

IP Address

185.229.9.134

Server Location

🇷🇺 Moscow, Russia

ASN

AS3175

Organization

Datahouse FOLGA

Server

Nginx

Nameservers

ns8-l2.nic.ru.ns1.klerk.ru.ns4-l2.nic.ru.

Performance

Page Speed

737 KB

250 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚙️ SSR

Decoupled

Frontend

Framework

Nuxt.js

Styling

Tailwind CSS

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Datahouse FOLGA

Progressive Web App

Web ManifestApple Touch IconTheme Color

Detected API Sources

https://vk.com/js/api/openapi....

Technology Stack

5 Technologies Detected

Meta Frameworks

CSS Frameworks

Icon Libraries

Fonts

Web Servers

SEO Analysis

B72/100

klerk.ruklerk.ru

Практическая помощь бухгалтеру — Клерк.ру

Самый крупный сайт в мире про бухгалтерский учет в РФ. Помогаем бухгалтерам, ИП и бизнесу не переплачивать налоги, правильно вести учет и быть в курсе всех и...

Description truncated.

Title Length41 chars

Recommended: 50-60 chars

Description Length255 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

104 rules

Sitemap reference found

Sponsored

Security Score

51%Poor

Interactive

HTTPS

No WAF

278d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

22.10.2025

Valid Until

23.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.klerk.ruklerk.ru

SHA-256 Fingerprint

A7:BE:46:5C:1D:46:CF:38:DD:1F:28:4E:50:CC:86:4C:CB:24:5C:60...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

⚡ Brotli(br)

content-type

text/html;charset=utf-8

date

Wed, 18 Feb 2026 04:41:33 GMT

referrer-policy

no-referrer-when-downgrade

server

nginx/1.26.1

strict-transport-security

max-age=604800

Good Warning Issue

Email Infrastructure

Yandex Mail

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

mx.yandex.net

Domain Information

klerk.ru

Domain Age

24y 1m

Created

16.01.2002

Expires

18.01.2027

Registrar

RD-RU

DNSSEC

Not Enabled

Typography & Readability

Arial

33/100

Readability

/30

12/40

13px · LH 1.23

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Arial

Sans

Body Font

Arial

Sans13px

Contrast Ratio

Reading Comfort

~411 CPL

Needs attention

16px

24px

13px

Perfect Fifth

Scale

❌ Critical: 13px body text is too small. Increase to at least 14px.

✅ Good performance: Using 1 font families keeps load times fast.

✅ 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.

❌ Very long lines: ~411 chars/line causes eye strain. Use max-width: 65ch.

⚠️ Cramped layout: 82 elements lack adequate spacing.

GGoogle Fonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

20 Resources

Scripts

Styles

Async

Defer

Top Script Sources

top-fwz1.mail.ru(2)local(1)api.s.mindbox.ru(1)klad.klerk.ru(1)vk.com(1)

Website Identity

Sponsored

Last analyzed: 18 Feb 2026 at 04:41

Historical Analysis & Change Tracking