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scheme.org

https://scheme.org· First analyzed 06 May 2026· Updated 06 May 2026
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scheme.org
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Hosting Provider

The Constant Company, LLC

IP Address

64.176.208.18

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Piscataway, United States

ASN

AS20473

Organization

The Constant Company, LLC

Server

Nginx

Nameservers

ns-4-a.gandi.net.ns-35-b.gandi.net.ns-237-c.gandi.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
441 ms10%
Speed Index
573 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
13 KB
2 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
The Constant Company, LLC

Technology Stack

1 Technologies Detected

Web Servers

1
Nginx

SEO Analysis

C62/100
17
6
0
Meta Tags12/15
Content12/12
Headings8/8
Technical13/21
E-E-A-T0/7
Images0/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
S
scheme.orgscheme.org

The Scheme Programming Language

Scheme is a minimalist dialect of the Lisp family of programming languages. This is the official website for the Scheme language.

Title Length31 chars

Recommended: 50-60 chars (~198px / 580px)

Description Length129 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

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    Local SEO

    Local Search Readiness

    3/100
    Poor
    1 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

    D45/100
    Bot Access
    20/25
    Machine Read.
    14/25
    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
    blockquotes
    Text ratio:37%
    Words:544
    Token eff.:Optimal
    Sections/1K:9.2
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary46w
    Descriptive Headingsavg 1.6w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    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
    10
    Passed
    2
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    16/20
    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
    1/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •Accessibility recommendation preview...
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    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.
    54/100
    A+
    2 mg
    CO₂e / view
    13.1 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    2 mg
    vs
    Returning (cached)
    <0.001 g
    Annual (10K/mo)
    192 g
    Emission Segments
    Data Center
    <0.001 g
    Network
    <0.001 g
    Device
    <0.001 g
    Resource Breakdown
    CSS
    3.1 KB
    HTML
    10.0 KB
    Green Hosting Not Verified
    The Constant Company, LLC
    4 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A+

    Security Score

    98%Excellent
    Static / Informational

    HTTPS

    No WAF

    65d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/1.1

    Valid From

    11.04.2026

    Valid Until

    10.07.2026

    Subject Alternative Names (20)

    bigloo.scheme.orgchez.scheme.orgchibi.scheme.orgchicken.scheme.orgcyclone.scheme.orgfaq.scheme.orggauche.scheme.orgguile.scheme.org+12 more

    SHA-256 Fingerprint

    43:F7:E3:92:23:DD:72:A7:E6:0C:C7:42:71:27:DD:54:46:8F:79:FD...

    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    connection
    keep-alive
    content-length
    9936
    content-security-policy
    default-src 'self'; style-src 'self' 'unsafe-inline'; script...
    content-type
    text/html
    date
    Wed, 06 May 2026 08:19:26 GMT
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    0

    SPF
    DKIM
    DMARC

    Domain Information

    scheme.org

    Domain Age
    28 years

    Created

    16.04.1998

    Expires

    15.04.2029

    Last Updated

    28.05.2025

    Registrar

    Gandi SAS

    DNSSEC
    Not Enabled

    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
    49/100
    Not 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
    4 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    sans-serif

    WCAG Partial
    75/100
    Readability
    /30
    23/30

    16px · LH 1.40

    Hierarchy
    /20
    19/20

    6x ratio · ✓ H1→H6

    WCAG
    /25
    19/25

    2.24:1 min contrast

    Performance
    /25
    14/25

    0 fonts

    Heading Font

    sans-serif

    Sans96px

    Body Font

    sans-serif

    Sans16px

    Contrast Ratio

    2.24:1

    2 issues

    Reading Comfort

    ~41 CPL

    Narrow lines
    96px
    h1
    24px
    h2
    16px
    p

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

    ✅ Optimal line spacing: 1.40 ratio (ideal range 1.4–1.6).

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

    ⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 2.2:1).

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

    ✅ Strong hierarchy: Headlines are 6.0x larger than body text.

    Flesch 0

    Color Palette

    7 unique colors
    Light
    #8c9b88
    Secondary· 4.3%
    #f3eec4
    Primary· 75.4%
    #86d68d
    Secondary· 12.3%
    #b4c3a7
    Secondary· 2.8%
    #81c7a1
    Secondary· 1.8%
    #a7dca1
    Secondary· 0.6%

    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

    1 Resources

    0
    Scripts
    1
    Styles
    0
    Async
    0
    Defer

    Top Script Sources

    Website Identity

    scheme.org

    28 years old
    Location detected: 🇺🇸 United Statesvia ip
    Gandi SASen

    Sponsored

    Last analyzed: 06 May 2026 at 08:19

    Historical Analysis & Change Tracking

    scheme.org Technology Stack - Built With Nginx | StackOptic | StackOptic