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codesandbox.io

https://codesandbox.io· First analyzed 17 Feb 2026· Updated 17 Feb 2026
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codesandbox.io
Desktop screenshot of codesandbox.io
Mobile screenshot of codesandbox.io
Mobile

Sponsored

Hosting Provider

cloudflare.com

IP Address

172.64.144.247

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

adel.ns.cloudflare.com.greg.ns.cloudflare.com.

Performance

Page Speed

4.6 MB
55 requests

Image Optimization

Lazy LoadResponsiveVercel Image Optimization
0–49
50–89
90–100

Architecture Stack

Hybrid
🔀 Hybrid
Frontend
Framework
Next.js
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Technology Stack

4 Technologies Detected

Meta Frameworks

2

CSS Frameworks

1

SEO Analysis

A82/100
12
2
0
C
codesandbox.iocodesandbox.io

CodeSandbox: Instant Cloud Development Environments

CodeSandbox is a cloud development platform that empowers developers to code, collaborate and ship projects of any size from any device in record time.

Title Length51 chars

Recommended: 50-60 chars

Description Length151 chars

Recommended: 120-160 chars

Issues (0)

    Crawlability

    Sitemap

    Type: standard

    robots.txt

    2 rules

    Allows all crawlers

    Sponsored

    Sponsored

    F

    Security Score

    26%Critical
    Interactive

    HTTPS

    WAF

    75d

    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

    02.02.2026

    Valid Until

    03.05.2026

    Subject Alternative Names (2)

    *.nodebox.codesandbox.iocodesandbox.io

    SHA-256 Fingerprint

    90:0C:8A:93:15:C8:AC:E3:BF:15:D5:12:67:A7:CC:10:C1:19:E6:DD...

    Top Recommendations

    Security recommendation preview

    HTTP Headers

    Developer Console

    date
    Tue, 17 Feb 2026 13:47:37 GMT
    content-type
    text/html; charset=utf-8
    content-encoding
    Brotli(br)
    vary
    RSC, Next-Router-State-Tree, Next-Router-Prefetch, Next-Url,...
    x-nextjs-cache
    HIT
    x-powered-by
    Next.js
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    68

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (5)

    alt1.aspmx.l.google.com
    aspmx.l.google.com
    alt2.aspmx.l.google.com
    alt3.aspmx.l.google.com

    +1 more

    Domain Information

    codesandbox.io

    Domain Age
    9y 2m

    Created

    23.11.2016

    Expires

    23.11.2029

    Last Updated

    26.10.2020

    Registrar

    NameCheap, Inc.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot
    Privacy policy page linked

    Typography & Readability

    Inter + __Inter_f367f3

    82/100
    Readability
    /30
    40/40

    18px · LH 1.40

    Hierarchy
    /20
    21/25

    6.67x ratio

    WCAG
    /25
    15/15

    Contrast: undefined

    Performance
    /25
    13/20

    2 fonts

    Heading Font

    Inter

    Sans120px

    Body Font

    __Inter_f367f3

    Sans18px

    Contrast Ratio

    --

    Reading Comfort

    ~42 CPL

    Needs attention
    120px
    h1
    24px
    h2
    14px
    h3
    24px
    h4
    18px
    p

    ✅ Excellent readability: 18px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

    ✅ Strong hierarchy: Headlines are 6.7x larger than body text.

    ✅ Good performance: Using 2 font families keeps load times fast.

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

    ⚠️ Cramped layout: 57 elements lack adequate spacing.

    Buy on MyFontsVariable Fonts

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    23 Resources

    20
    Scripts
    3
    Styles
    20
    Async
    0
    Defer

    Top Script Sources

    local(20)

    Website Identity

    codesandbox.io

    9 years old
    NameCheap, Inc.📧 Google Workspace

    Sponsored

    Last analyzed: 17 Feb 2026 at 13:48

    Historical Analysis & Change Tracking