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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yadi.sk

https://yadi.sk· First analyzed 12 Feb 2026· Updated 12 Feb 2026

Export

yadi.sk

Mobile

Sponsored

Hosting Provider

Yandex LLC

IP Address

87.250.250.50

Server Location

🇷🇺 Moscow, Russia

ASN

AS13238

Organization

Yandex LLC

Nameservers

ns3.yandex.ru.ns4.yandex.ru.

Performance

Page Speed

1.2 MB

72 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Yandex LLC

Technology Stack

2 Technologies Detected

Other

Lottie

CSS Frameworks

Tailwind CSS

SEO Analysis

D58/100

yadi.skyadi.sk

Yandex Disk — your Yandex 360 cloud for files, photos, and videos

Yandex Disk — your cloud for files, photos, and videos. Keep your important files safe and access them from any device. Choose between paid and free plans, a...

Description truncated.

Title Length65 chars

Recommended: 50-60 chars

Description Length190 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (4/6)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

47 rules

Sitemap reference found

Sponsored

A+

Security Score

96%Excellent

Static / Informational

HTTPS

No WAF

131d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

24.12.2025

Valid Until

23.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (7)

360.yandex.ru360.yandex.com.tr360.yandex.uz360.yandex.kz360.yandex.by360.yandex360.yandex.com

SHA-256 Fingerprint

03:53:80:FF:14:5E:83:B6:52:2E:6A:C2:FC:64:63:AE:D8:90:94:1A...

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🔴 No Cache(max-age=0, must-revalidate, proxy-revalidate, no-cache, no-s...)

content-encoding

📦 Gzip(gzip)

content-security-policy

default-src 'none'; script-src yastatic.net https://*.static...

content-type

text/html; charset=utf-8

date

Thu, 12 Feb 2026 18:48:41 GMT

expires

Thu, 01 Jan 1970 00:00:01 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

yadi.sk

DNSSEC

Not Enabled

Typography & Readability

Helvetica Neue

74/100

Readability

/30

32/40

20px · LH 1.20

Hierarchy

/20

21/25

2.8x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Helvetica Neue

Sans56px

Body Font

Helvetica Neue

Sans20px

Contrast Ratio

Reading Comfort

~44 CPL

Needs attention

56px

48px

20px

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

✅ Strong hierarchy: Headlines are 2.8x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 32 elements lack adequate spacing.

Buy on MyFontsVariable Fonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

yastatic.net(2)mc.yandex.ru(1)

Website Identity

X (Twitter)Telegram

Sponsored

Last analyzed: 12 Feb 2026 at 18:49

Historical Analysis & Change Tracking