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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delfi.lt

https://delfi.lt· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

delfi.lt

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.66.157.134

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns1.delfi.lt.ns2.delfi.lt.ns2.domreg.lt.

Performance

Page Speed

548 KB

250 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚙️ SSR

Decoupled

Frontend

Framework

Nuxt.js

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Detected API Sources

https://auth.delfi.lt/id/api/v...

Technology Stack

25 Technologies Detected

Advertising

Google Ads Criteo Taboola Outbrain

Analytics

Payments

Frameworks

Meta Frameworks

Libraries

UI Components

CSS Frameworks

Icon Libraries

Fonts

Tag Managers

Other

Social

Comments

CDN

Plugins

SEO Analysis

A88/100

delfi.ltdelfi.lt

Delfi naujienos - Pagrindinis žinių portalas Lietuvoje

Naujienos, kurias sužinosite pirmas. Svarbiausios žinios Lietuvoje ir pasaulyje. Delfi - nr.1 naujienų portalas Lietuvoje.

Title Length54 chars

Recommended: 50-60 chars

Description Length122 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

299 URLs

robots.txt

62 rules

Sitemap reference found

Sponsored

Security Score

5%Critical

Critical / Transactional

HTTPS

WAF

31d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

23.12.2025

Valid Until

23.03.2026

Subject Alternative Names (2)

*.delfi.ltdelfi.lt

SHA-256 Fingerprint

BB:71:EA:AA:DD:93:E3:2D:9B:D1:C3:C6:CC:68:FD:02:79:40:65:60...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

none

age

alt-svc

h3=":443"; ma=86400

cache-control

🟡 60s(public, max-age=60, stale-while-revalidate=60, stale-if-erro...)

cf-cache-status

HIT

cf-ray🇳🇱 Amsterdam

9d0501a74f42664c-AMS

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

delfi-lt.mail.protection.outlook.com

Domain Information

delfi.lt

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Data Protection Officer mentioned

Legitimate interest basis mentioned

Typography & Readability

Inter + sans-serif

70/100

Readability

/30

32/40

15px · LH 1.60

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Inter

Sans

Body Font

sans-serif

Sans15px

Contrast Ratio

Reading Comfort

Dual Sans-Serif

left aligned

15px

16px

15px

Minor Third

Scale

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

⚠️ Cramped layout: 110 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

7 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

TaboolaMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

CookiebotMid-Market

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

Reviews & Social Proof

TrustpilotMid-Market

Customer reviews and testimonials

Sponsored

Scripts & Styles

29 Resources

Scripts

Styles

Async

Defer

Top Script Sources

consent.cookiebot.com(3)youtube.com(2)googletagmanager.com(2)static.delfi.lt(2)lt-production-portal-root.s3.delfi.lt(2)

Website Identity

Facebook X (Twitter)Instagram LinkedIn TikTok

Sponsored

Last analyzed: 19 Feb 2026 at 10:16

Historical Analysis & Change Tracking