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.

Back to Search

bg.ac.rs

https://bg.ac.rs· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

bg.ac.rs

Mobile

Sponsored

Hosting Provider

University of Belgrade

IP Address

147.91.1.21

Server Location

🇷🇸 Belgrade, Serbia

ASN

AS13092

Organization

University of Belgrade

Server

Nginx

Nameservers

ns.rcub.bg.ac.rs.ban.junis.ni.ac.rs.gaea.rcub.bg.ac.rs.ns1.uns.ac.rs.+2 more

Performance

Page Speed

9.6 MB

74 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9.1

cms

Hello Elementorv2.9.0

by Elementor Team

View Theme

Technology Stack

14 Technologies Detected

Plugins

Themesflat Addons For Elementor

Elementor

3D Flipbook Dflip Lite

Elementor

Image Hover Effects Addon For Elementor

Libraries

Other

UI Components

CSS Frameworks

Icon Libraries

Fonts

Web Servers

SEO Analysis

F32/100

bg.ac.rsbg.ac.rs

Univerzitet u Beogradu

No description available for this page.

Title Length22 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description - important for click-through rates
• Missing H1 tag - every page should have one H1
• Many images missing alt text (12/12)

7 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

4 URLs

robots.txt

4 rules

Sitemap reference found

Sponsored

Security Score

21%Critical

Interactive

HTTPS

No WAF

44d

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/1.1

Valid From

31.12.2025

Valid Until

31.03.2026

Subject Alternative Names (2)

bg.ac.rswww.bg.ac.rs

SHA-256 Fingerprint

D2:F9:B7:1A:B6:E2:18:6B:73:4A:7C:94:C0:2B:DA:A6:0E:A2:7B:0F...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

connection

keep-alive

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=UTF-8

date

Sun, 15 Feb 2026 02:18:29 GMT

link

<https://www.bg.ac.rs/wp-json/>; rel="https://api.w.org/", <...

server

nginx/1.18.0 (Ubuntu)

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

afrodita.rcub.bg.ac.rs

Domain Information

bg.ac.rs

DNSSEC

Not Enabled

Typography & Readability

Artifakt Element

63/100

Readability

/30

32/40

14px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Artifakt Element

Sans

Body Font

Artifakt Element

Sans14px

Contrast Ratio

Reading Comfort

~43 CPL

Needs attention

28px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ 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.

⚠️ Cramped layout: 27 elements lack adequate spacing.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

bg.ac.rs(20)

Website Identity

Facebook X (Twitter)Instagram YouTube

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Last analyzed: 15 Feb 2026 at 02:18

Historical Analysis & Change Tracking