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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dtf.ru

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

Export

dtf.ru

Sponsored

Hosting Provider

Selectel

IP Address

5.188.161.116

Server Location

🇷🇺 St Petersburg, Russia

ASN

AS49505

Organization

Selectel

CDN

Cloudflare

WAF

Cloudflare

Nameservers

iris.ns.cloudflare.com.noel.ns.cloudflare.com.

Performance

Page Speed

817 KB

100 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Selectel

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

4 Technologies Detected

CSS Frameworks

Fonts

Tag Managers

Payments

SEO Analysis

D55/100

dtf.rudtf.ru

DTF — игры, кино, сериалы, разработка, сообщество

Площадка для обсуждения игр и кино. Новости игровой индустрии, обзоры, аналитика, мемы. Создавайте свои записи, комментируйте чужие, оценивайте контент, кото...

Description truncated.

Title Length49 chars

Recommended: 50-60 chars

Description Length174 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (44/53)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

521 URLs

robots.txt

27 rules

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

70d

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

28.01.2026

Valid Until

28.04.2026

Subject Alternative Names (2)

*.dtf.rudtf.ru

SHA-256 Fingerprint

F5:63:80:34:0A:3E:A4:C9:A0:BE:B5:A4:EB:30:34:BF:F0:08:FE:82...

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

Mon, 16 Feb 2026 14:40:42 GMT

set-cookie

stickydude

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt4.aspmx.l.google.com

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

dtf.ru

Domain Age

26y 9m

Created

11.05.1999

Expires

31.05.2026

Registrar

RU-CENTER-RU

DNSSEC

Not Enabled

Typography & Readability

Roboto + system-ui

69/100

Readability

/30

40/40

17px · LH 1.53

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Roboto

Body Font

system-ui

Sans17px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

17px

✅ Excellent readability: 17px body text is ideal for all devices.

✅ Optimal line spacing: 1.53 ratio ensures comfortable reading.

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

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

⚠️ Cramped layout: 12 elements lack adequate spacing.

GGoogle Fonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

yandex.ru(3)local(2)s3.wi-fi.ru(2)yastatic.net(2)cdn-c.skcrtxr.com(1)

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Last analyzed: 16 Feb 2026 at 14:40

Historical Analysis & Change Tracking