StackOptic
Back to Search
21.edu.ar favicon

21.edu.ar

https://21.edu.ar· First analyzed 25 Apr 2026· Updated 25 Apr 2026
Export
21.edu.ar
Desktop screenshot of 21.edu.ar
Mobile screenshot of 21.edu.ar
Mobile

Sponsored

Hosting Provider

Cloudflare
cloudflare.com

IP Address

172.66.147.153

Site Location

🇦🇷 Argentinavia tld

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

rita.ns.cloudflare.com.cleo.ns.cloudflare.com.

Performance

73

Core Web Vitals

Weight

First Contentful Paint
5.2 s10%
Speed Index
6.7 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
390 KB
114 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
HubSpot CMS

Technology Stack

20 Technologies Detected

Analytics

6
Google Analytics
Google Analytics 4
Facebook Pixel
Hotjar
Crazy EggMicrosoft Clarity

Advertising

4
Google AdsTwitter AdsLinkedIn AdsTikTok Pixel

Other

2
GSAPv3.11.4AOS (Animate On Scroll)

Libraries

1
jQueryv3.7.1

UI Components

1
Owl Carousel

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Fonts

1
Google Fonts

Tag Managers

1
Google Tag Manager

Marketing

1
HubSpot

CDN

1
Cloudflare

SEO Analysis

B74/100
22
6
0
Meta Tags11/15
Content11/12
Headings8/8
Technical19/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
2
21.edu.ar21.edu.ar

Universidad Siglo 21 | Siglo 21

La universidad privada más elegida del país. Inscripciones abiertas 2025, descubrí nuestra oferta académica completa.

Title Length31 chars

Recommended: 50-60 chars (~172px / 580px)

Description Length117 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    917 URLs

    robots.txt

    6 rules

    Local SEO

    Local Search Readiness

    7/100
    Poor
    2 14 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    F39/100
    Bot Access
    20/25
    Machine Read.
    10/25
    Schema Data
    0/25
    Citation
    9/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    nav
    Text ratio:3%
    Words:854
    Token eff.:Optimal
    Sections/1K:25.8
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary182w
    Descriptive Headingsavg 2w
    Canonical URL
    Open Graph2/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    B
    75/100
    12
    Passed
    3
    Critical
    2
    Warnings
    Images & Alt Text
    15/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    10/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    9/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    9/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    3 recommendations
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    80/100
    A+
    39 mg
    CO₂e / view
    390.0 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    45 mg
    vs
    Returning (cached)
    23 mg
    Annual (10K/mo)
    4.7 kg
    Emission Segments
    Data Center
    2 mg
    Network
    12 mg
    Device
    26 mg
    Resource Breakdown
    JavaScript
    262.5 KB
    Images
    684 B
    CSS
    89.2 KB
    Fonts
    2.7 KB
    HTML
    30.1 KB
    Other
    4.7 KB
    Green Hosting Verified
    Cloudflare
    GWF Verified
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    C

    Security Score

    66%Fair
    Interactive

    HTTPS

    WAF

    86d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    GoDaddy.com, Inc.

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    09.07.2025

    Valid Until

    21.07.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    *.21.edu.ar21.edu.ar

    SHA-256 Fingerprint

    B8:68:6C:53:F2:4F:6F:04:18:0A:7F:1A:62:83:42:E9:DD:BD:2F:CE...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=86400
    cache-control
    🟡 5s(s-maxage=36000, max-age=5)
    cf-ray
    9f209c44dc640f74-EWR
    content-encoding
    ⚡ Brotli(br)
    content-security-policy
    upgrade-insecure-requests
    content-type
    text/html; charset=UTF-8
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    50

    SPF
    DKIM
    DMARC

    MX Records (1)

    21-edu-ar.mail.protection.outlook.com

    Domain Information

    21.edu.ar

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    B
    73/100
    Mobile Friendly5 breakpoints
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Inter + Nunito Sans

    WCAG Partial
    72/100
    Readability
    /30
    22/30

    25px · LH 1.34

    Hierarchy
    /20
    19/20

    2.53x ratio · ✓ H1→H6

    WCAG
    /25
    15/25

    1:1 min contrast

    Performance
    /25
    16/25

    3 fonts · 3 req

    Heading Font

    Inter

    Sans64px

    Body Font

    Nunito Sans

    Sans25px

    Contrast Ratio

    1:1

    10 issues

    Reading Comfort

    ~45 CPL

    Optimal (45–75)
    64px
    h1
    200px
    h2
    40px
    h3
    28px
    h4
    25px
    p
    Major Second
    Scale

    ✅ Excellent readability: 25px body text is ideal for all devices.

    ⚠️ Tight line spacing (1.34). Increase to 1.4–1.6 for better readability.

    ✅ Optimal line length: ~45 chars/line (ideal 45–75 CPL).

    ❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 10 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    GGoogle FontsBuy on MyFontsFlesch 0

    Color Palette

    11 unique colors
    16.7:1 AAA Light
    #ffffff
    Background· 38.2%
    #1d1e1f
    Text· 5.9%
    #65797e
    Primary· 5.6%
    #4a585c
    Secondary· 5.5%
    #d0ccba
    Secondary· 2.4%

    Business & Marketing Stack

    12 Tools Detected

    Enterprise

    CRM Systems

    1
    HubSpotMid-Market

    Customer Relationship Management platforms

    Marketing Automation

    1
    MarketoEnterprise

    Email marketing and automation platforms

    Behavior Analytics

    4
    Microsoft ClarityFree
    Crazy EggSMB
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    Advertising

    4
    Facebook PixelMid-Market
    Twitter/X AdsMid-Market
    LinkedIn AdsEnterprise
    TikTok PixelMid-Market

    Ad platforms and retargeting pixels

    Privacy & Cookies

    1
    CookiebotMid-Market

    Cookie consent and privacy compliance tools

    Social Media

    1
    Facebook SDKFree

    Social widgets and sharing tools

    6

    Categories

    12

    Total Tools

    2

    Enterprise

    5

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Sponsored

    Scripts & Styles

    26 Resources

    20
    Scripts
    6
    Styles
    15
    Async
    0
    Defer

    Top Script Sources

    analytics.tiktok.com(6)connect.facebook.net(2)snap.licdn.com(2)script.crazyegg.com(1)scripts.clarity.ms(1)

    Website Identity

    21.edu.ar

    Location detected: 🇦🇷 Argentinavia tld
    📧 Microsoft 365es

    Sponsored

    Last analyzed: 25 Apr 2026 at 21:59

    Historical Analysis & Change Tracking