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yellowlab.tools

https://yellowlab.tools· First analyzed 24 May 2026· Updated 24 May 2026
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yellowlab.tools
Desktop screenshot of yellowlab.tools
Mobile screenshot of yellowlab.tools
Mobile

Sponsored

Hosting Provider

Scaleway
scaleway.com

IP Address

62.210.211.205

Site Location

🇫🇷 Francevia ip

Server Location

🇫🇷 Paris, France

ASN

AS12876

Organization

ONLINE

Server

Nginx

Nameservers

ns-24-c.gandi.net.ns-186-a.gandi.net.ns-170-b.gandi.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
473 ms10%
Speed Index
615 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
143 KB
6 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Scaleway

Technology Stack

7 Technologies Detected

Frameworks

2
Angular
Express

Analytics

2
Google Analytics
Segment

Other

1
Chart.js

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginxv1.18.0

SEO Analysis

D49/100
13
8
0
Meta Tags12/15
Content3/12
Headings8/8
Technical9/21
E-E-A-T0/7
Images0/7
Links4/5
URL5/5
Social1/5
Freshness0/4
Mobile4/4
Indexability3/3
Y
yellowlab.toolsyellowlab.tools

Yellow Lab Tools - Page Speed audit

Yellow Lab Tools is a free online web performance analyzer. It audits a webpage for performance and front-end quality issues. And it's open-source!

Title Length35 chars

Recommended: 50-60 chars (~211px / 580px)

Description Length147 chars

Recommended: 120-160 chars

Issues (0)

    8 issues found

    Upgrade to view details

    Local SEO

    Local Search Readiness

    1/100
    Poor
    16 2

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

    Sponsored

    AI & LLM Readiness

    F31/100
    Bot Access
    20/25
    Machine Read.
    4/25
    Schema Data
    0/25
    Citation
    7/25

    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
    Text ratio:2%
    Words:179
    Token eff.:Too Short
    Sections/1K:167.6

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary14w
    Descriptive Headingsavg 4.3w
    Canonical URL
    Open Graph1/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (12)
    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.
    D
    44/100
    7
    Passed
    5
    Critical
    2
    Warnings
    Images & Alt Text
    5/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    11/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    3/15
    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
    1/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    4 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.
    87/100
    A+
    15 mg
    CO₂e / view
    143.4 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    17 mg
    vs
    Returning (cached)
    8 mg
    Annual (10K/mo)
    1.7 kg
    Emission Segments
    Data Center
    <0.001 g
    Network
    4 mg
    Device
    10 mg
    Resource Breakdown
    JavaScript
    126.6 KB
    Images
    914 B
    CSS
    3.7 KB
    HTML
    12.2 KB
    Green Hosting Verified
    Scaleway
    GWF Verified
    1 recommendation
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    F

    Security Score

    0%Critical
    Critical / Transactional

    HTTPS

    No WAF

    74d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/2

    Valid From

    09.05.2026

    Valid Until

    07.08.2026

    Subject Alternative Names (2)

    www.yellowlab.toolsyellowlab.tools

    SHA-256 Fingerprint

    56:DF:2A:07:F5:8A:CC:C9:48:6C:EF:D0:D8:8E:2F:FB:40:BC:3D:01...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-origin
    *
    cache-control
    🟡 20s(public, max-age=20)
    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=utf-8
    date
    Sun, 24 May 2026 16:09:08 GMT
    etag
    W/"c523-TXiOqHynTxM9NLp+4speW8RtxMs"
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    20

    SPF
    DKIM
    DMARC

    MX Records (2)

    spool.mail.gandi.net
    fb.mail.gandi.net

    Domain Information

    yellowlab.tools

    Domain Age
    11y 8m

    Created

    04.09.2014

    Expires

    04.09.2026

    Last Updated

    11.07.2025

    Registrar

    Gandi SAS

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    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.
    D
    51/100
    Mobile Friendly
    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,shrink-to-fit=no
    3 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Century Gothic

    WCAG Fail
    63/100
    Readability
    /30
    18/30

    14px · LH --

    Hierarchy
    /20
    16/20

    2.22x ratio · ✓ H1→H6

    WCAG
    /25
    15/25

    1:1 min contrast

    Performance
    /25
    14/25

    1 font

    Heading Font

    Century Gothic

    Sans32px

    Body Font

    Century Gothic

    Sans14px

    Contrast Ratio

    1:1

    17 issues

    Reading Comfort

    Single Font Family

    center aligned
    32px
    h1
    19px
    h2
    22px
    h3
    14px
    p

    ⚠️ Small text: 14px may strain on mobile. Use ≥16px for WCAG compliance.

    ⚠️ Hard to read: Flesch score 48/100. Simplify sentences for wider reach.

    ❌ Low contrast: 17 elements fail WCAG AA (min 1.0:1). Increase text/background contrast.

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

    ✅ Strong hierarchy: Headlines are 2.2x larger than body text.

    ✅ Lean font stack: 1 font families keeps load times fast.

    Buy on MyFontsFlesch 48

    Color Palette

    6 unique colors
    2.73:1 Fail Light
    #ffffff
    Background· 2%
    #a39b97
    Other· 1.6%
    #212240
    Primary· 93.39999999999999%
    #4c5060
    Secondary· 1.6%
    #6a7181
    Secondary· 1.2%
    #eddfcb
    Secondary· 0.5%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    3 Resources

    2
    Scripts
    1
    Styles
    1
    Async
    0
    Defer

    Top Script Sources

    google-analytics.com(1)js(1)

    Website Identity

    yellowlab.tools

    11 years old
    Location detected: 🇫🇷 Francevia ip
    Gandi SAS

    Social Profiles

    GitHub

    Sponsored

    Last analyzed: 24 May 2026 at 16:09

    Historical Analysis & Change Tracking