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stackblitz.com

https://stackblitz.com· First analyzed 25 Apr 2026· Updated 25 Apr 2026
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stackblitz.com
Desktop screenshot of stackblitz.com
Mobile screenshot of stackblitz.com
Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

13.32.121.106

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 New York, United States

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

zoe.ns.cloudflare.com.igor.ns.cloudflare.com.

Performance

98

Core Web Vitals

Weight

First Contentful Paint
872 ms10%
Speed Index
1.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
470 KB
64 requests

Image Optimization

Lazy LoadWebP
0–49
50–89
90–100

Architecture Stack

JAMstack
🔀 Hybrid
Frontend
Framework
Astrov4.5.13
Infrastructure
Platform
AWS CloudFront
CDN
Cloudflare

Technology Stack

6 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

Meta Frameworks

1
Astro

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

CDN

1
Cloudflare

SEO Analysis

C69/100
21
7
0
Meta Tags14/15
Content8/12
Headings3/8
Technical16/25
E-E-A-T3/7
Images6/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile1/4
Indexability3/3
S
stackblitz.comstackblitz.com

StackBlitz | Instant Dev Environments | Click. Code. Done.

StackBlitz is the collaborative browser-based IDE for web developers. StackBlitz eliminates time-consuming local configuration and lets developers spend more...

Description truncated.
Title Length58 chars

Recommended: 50-60 chars (~338px / 580px)

Description Length172 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    1 URLs

    1 sub-sitemaps

    robots.txt

    Local SEO

    Local Search Readiness

    12/100
    Poor
    3 13 2

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

    Sponsored

    AI & LLM Readiness

    D40/100
    Bot Access
    20/25
    Machine Read.
    3/25
    Schema Data
    0/25
    Citation
    17/25

    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:5%
    Words:265
    Token eff.:Too Short
    Sections/1K:11.3
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary26w
    Descriptive Headingsavg 8.7w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (9)
    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
    76/100
    9
    Passed
    4
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    13/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    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
    4/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •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.
    76/100
    A
    48 mg
    CO₂e / view
    470.3 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    54 mg
    vs
    Returning (cached)
    27 mg
    Annual (10K/mo)
    5.7 kg
    Emission Segments
    Data Center
    2 mg
    Network
    14 mg
    Device
    31 mg
    Resource Breakdown
    JavaScript
    68.9 KB
    Images
    76.6 KB
    CSS
    316.2 KB
    HTML
    7.9 KB
    Other
    728 B
    Green Hosting Verified
    Amazon Web Services (AWS)
    Provider Match
    2 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    B

    Security Score

    78%Good
    Static / Informational

    HTTPS

    WAF

    159d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Amazon

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    18.03.2026

    Valid Until

    01.10.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (1)

    stackblitz.com

    SHA-256 Fingerprint

    FA:83:64:EE:BF:CB:5E:93:41:07:0D:DE:16:B5:92:46:37:92:DF:8D...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-origin
    *
    cache-control
    🟡 0s(public, max-age=0, must-revalidate)
    cf-ray🇺🇸 Washington DC
    9f1dce1d1bacf284-IAD
    content-encoding
    ⚡ Brotli(br)
    content-type
    text/html; charset=utf-8
    date
    Sat, 25 Apr 2026 13:48:24 GMT
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    65

    SPF
    DKIM
    DMARC

    DMARC Policy

    None (Monitor Only)

    MX Records (5)

    alt4.aspmx.l.google.com
    alt3.aspmx.l.google.com
    aspmx.l.google.com
    alt1.aspmx.l.google.com

    +1 more

    Domain Information

    stackblitz.com

    Domain Age
    12y 4m

    Created

    17.12.2013

    Expires

    17.12.2026

    Last Updated

    17.12.2025

    Registrar

    1API GmbH

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    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.
    C
    62/100
    Mobile Friendly8 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
    3 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Manrope + Inter

    WCAG Partial
    66/100
    Readability
    /30
    20/30

    16px · LH 2.00

    Hierarchy
    /20
    15/20

    5.88x ratio

    WCAG
    /25
    16/25

    1:1 min contrast

    Performance
    /25
    15/25

    2 fonts · 3 req

    Heading Font

    Manrope

    Sans94px

    Body Font

    Inter

    Sans16px

    Contrast Ratio

    1:1

    45 issues

    Reading Comfort

    ~36 CPL

    Narrow lines
    94px
    h1
    40px
    h3
    16px
    p

    ✅ Excellent readability: 16px body text is ideal for all devices.

    ⚠️ Wide line spacing (2.00). 1.4–1.6 is optimal for body text.

    ⚠️ Hard to read: Flesch score 37/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 45 elements below WCAG AA threshold (min 1.0:1).

    ❌ Broken heading hierarchy: 2 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

    ✅ Strong hierarchy: Headlines are 5.9x larger than body text.

    Buy on MyFontsFlesch 37

    Color Palette

    2 unique colors
    Light
    #1c1f26
    Primary· 92%
    #96a1ae
    Secondary· 8.1%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    8 Resources

    3
    Scripts
    5
    Styles
    2
    Async
    0
    Defer

    Top Script Sources

    googletagmanager.com(2)local(1)

    Website Identity

    stackblitz.com

    12 years old
    Location detected: 🇺🇸 United Statesvia ip
    1API GmbH📧 Google Workspaceen

    Sponsored

    Last analyzed: 25 Apr 2026 at 13:48

    Historical Analysis & Change Tracking