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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litres.ru

https://litres.ru· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

litres.ru

Sponsored

Hosting Provider

LLC "LitRes"

IP Address

193.26.19.14

Server Location

🇷🇺 Moscow, Russia

ASN

AS61306

Organization

LLC "LitRes"

Server

ddos-guard

Nameservers

ns3.litres.ru.ns4.litres.ru.ns1.litres.ru.ns2.litres.ru.

Performance

Page Speed

162 KB

133 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚙️ SSR

Decoupled

Frontend

Framework

Next.js

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

LLC "LitRes"

Progressive Web App

Web ManifestApple Touch Icon

Detected API Sources

//vk.com/js/api/openapi.js

Technology Stack

6 Technologies Detected

Analytics

Meta Frameworks

Tag Managers

Frameworks

CDN

SEO Analysis

C64/100

litres.rulitres.ru

Литрес – сервис электронных и аудиокниг, скачать в fb2 и mp3, читат...

Литрес – цифровой сервис электронных и аудиокниг, а также другого контента: подкасты, спектакли, интервью – скачивай, читай и слушай на любых устройствах. На...

Title truncated. Description truncated.

Title Length95 chars

Recommended: 50-60 chars

Description Length264 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

54 rules

Allows all crawlers

Sponsored

Security Score

26%Critical

Interactive

HTTPS

No WAF

229d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

02.09.2025

Valid Until

04.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.litres.rulitres.ru

SHA-256 Fingerprint

9F:71:78:65:DE:AD:B6:93:AF:15:EF:AB:8D:25:B4:A5:5B:B3:2A:F7...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=utf-8

date

Mon, 16 Feb 2026 22:54:17 GMT

document-policy

js-profiling

etag

W/"aad4e-mu2U7ZDYP3jWhY7oFdtac53vuDQ"

link

<https://cdn.litres.ru/static/litres/fonts/ALSSirius-Regular...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

ASPMX2.GOOGLEMAIL.COM

ASPMX.L.GOOGLE.COM

ASPMX3.GOOGLEMAIL.COM

ALT2.ASPMX.L.GOOGLE.COM

+1 more

Domain Information

litres.ru

Domain Age

20y 4m

Created

15.10.2005

Expires

15.10.2026

Registrar

RD-RU

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

ALS Sirius + arial

51/100

Readability

/30

20/40

10px · LH 1.60

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

ALS Sirius

Body Font

arial

Sans10px

Contrast Ratio

Reading Comfort

Mixed Pairing

left aligned

10px

❌ Critical: 10px body text is too small. Increase to at least 14px.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

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

⚠️ Cramped layout: 15 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.litres.ru(14)top-fwz1.mail.ru(1)cdn.segmento.ru(1)abt.s3.yandex.net(1)mc.yandex.ru(1)

Website Identity

Sponsored

Last analyzed: 16 Feb 2026 at 22:54

Historical Analysis & Change Tracking