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callisonrtkl.com

https://callisonrtkl.com· First analyzed 29 May 2026· Updated 29 May 2026
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callisonrtkl.com
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Mobile

Sponsored

Hosting Provider

Rackspace
rackspace.com

IP Address

104.130.4.33

Site Location

🇳🇱 Netherlandsvia phone

Server Location

🇺🇸 Washington, United States

ASN

AS27357

Organization

Cloud Servers Cell 0001-0003 IAD3

CDN

Cloudflare

WAF

Cloudflare

Nameservers

dns2.stabletransit.com.dns1.stabletransit.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
633 ms10%
Speed Index
823 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
537 KB
35 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Tailwind CSS
CMS
Sitecore
Infrastructure
Hosting
Rackspace
CDN
Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

8 Technologies Detected

Analytics

3
Google Analytics
Hotjar
Crazy Egg

Frameworks

1
React

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Advertising

1
Twitter Ads

Security

1
reCAPTCHA

SEO Analysis

B75/100
22
6
0
Meta Tags14/15
Content10/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social3/5
Freshness0/4
Mobile4/4
Indexability3/3
C
callisonrtkl.comcallisonrtkl.com

Architecture | Services | Arcadis | Service | Arcadis

Innovative design solutions for complex building projects. Arcadis delivers award-winning architectural expertise across sectors and typologies. Discuss your...

Description truncated.
Title Length53 chars

Recommended: 50-60 chars (~308px / 580px)

Description Length173 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    15,008 URLs

    robots.txt

    8 rules

    Sitemap reference found

    Local SEO

    Local Search Readiness

    18/100
    Poor
    5 10 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.
    0/25
    Schema Data
    0/25
    Citation
    11/25

    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:8%
    Words:5,502
    Token eff.:Excessive

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary38w
    Descriptive Headings
    Canonical URL
    Open Graph3/3
    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.
    A
    87/100
    15
    Passed
    1
    Critical
    1
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    20/20
    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
    11/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    6/15
    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.
    80/100
    A
    54 mg
    CO₂e / view
    536.5 KB
    Page Weight
    80%
    Cleaner Than
    New Visitor
    62 mg
    vs
    Returning (cached)
    31 mg
    Annual (10K/mo)
    6.5 kg
    Emission Segments
    Data Center
    3 mg
    Network
    16 mg
    Device
    36 mg
    Resource Breakdown
    JavaScript
    334.7 KB
    Images
    1018 B
    CSS
    164.6 KB
    HTML
    36.2 KB
    Green Hosting Verified
    Rackspace
    Provider Match
    2 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    C

    Security Score

    69%Fair
    Interactive

    HTTPS

    WAF

    187d

    Certificate Details

    Type

    Organization Validated (OV)

    Certificate Authority

    DigiCert Inc

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-512 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    03.11.2025

    Valid Until

    02.12.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (3)

    www.arcadis.comarcadis.commta-sts.arcadis.com

    SHA-256 Fingerprint

    16:0D:4E:E3:7F:D6:E9:5E:8F:BE:AD:AA:C8:BE:8D:03:33:E4:08:11...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    alt-svc
    h3=":443"; ma=86400
    cf-cache-status
    DYNAMIC
    cf-ray
    a033628e1fc9c52e-SJC
    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=utf-8
    cross-origin-opener-policy
    same-origin
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    55

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    Domain Information

    callisonrtkl.com

    Domain Age
    11y 2m

    Created

    16.03.2015

    Expires

    16.03.2028

    Last Updated

    07.02.2025

    Registrar

    MarkMonitor 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
    Data Protection Officer mentioned
    Legitimate interest basis mentioned

    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.
    A
    83/100
    Mobile Friendly24 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=1.0
    1 recommendation
    • •Mobile compatibility recommendation preview...
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    Typography & Readability

    FS Elliot Pro

    WCAG Partial
    81/100
    Readability
    /30
    22/30

    18px · LH 1.50

    Hierarchy
    /20
    20/20

    3.11x ratio · ✓ H1→H6

    WCAG
    /25
    19/25

    1.3:1 min contrast

    Performance
    /25
    20/25

    1 font · 2 req

    Heading Font

    FS Elliot Pro

    Sans56px

    Body Font

    FS Elliot Pro

    Sans18px

    Contrast Ratio

    1.3:1

    1 issue

    Reading Comfort

    ~57 CPL

    Optimal (45–75)
    56px
    h1
    96px
    h2
    32px
    h3
    18px
    p
    Minor Second
    Scale

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

    ✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

    ✅ Optimal line length: ~57 chars/line (ideal 45–75 CPL).

    ❌ Very complex text: Flesch score 7/100. Consider shorter sentences and simpler words.

    ⚠️ Partial contrast: 1 elements below WCAG AA threshold (min 1.3:1).

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

    Buy on MyFontsFlesch 7

    Color Palette

    7 unique colors
    2.54:1 Fail Light
    #f5f5f5
    Background· 67.60000000000001%
    #9c9aa6
    Other· 4.7%
    #000000
    Primary· 0%
    #4575ae
    Secondary· 7.5%
    #31344f
    Secondary· 7.4%
    #688ec3
    Secondary· 6%
    #6e768c
    Secondary· 4.1%

    Business & Marketing Stack

    3 Tools Detected

    Advanced

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    Privacy & Cookies

    1
    CookiebotMid-Market

    Cookie consent and privacy compliance tools

    2

    Categories

    3

    Total Tools

    0

    Enterprise

    1

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    10 Resources

    9
    Scripts
    1
    Styles
    4
    Async
    3
    Defer

    Top Script Sources

    local(3)consent.cookiebot.com(2)img03.en25.com(1)googletagmanager.com(1)js.monitor.azure.com(1)

    Website Identity

    callisonrtkl.com

    +31%20(0)%2088%204261%20261
    11 years old

    Arcadis N.V.Parnassusweg 793, 1082 LZ, P.O. Box 78951008 AB, AmsterdamNetherlands

    Location detected: 🇳🇱 Netherlandsvia phone
    MarkMonitor Inc.en

    Sponsored

    Last analyzed: 29 May 2026 at 06:19

    Historical Analysis & Change Tracking

    callisonrtkl.com Technology Stack - Built With React, Tailwind CSS, Google Analytics, Google Tag Manager, Hotjar | StackOptic | StackOptic