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opencpn.org

https://opencpn.org· First analyzed 16 May 2026· Updated 16 May 2026
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opencpn.org
Desktop screenshot of opencpn.org
Mobile screenshot of opencpn.org
Mobile

Sponsored

Hosting Provider

VeeroTech Systems LLC

IP Address

192.138.189.133

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Cary, United States

ASN

AS394344

Organization

VeeroTech Systems LLC

Server

LiteSpeed

Nameservers

ns3.veerotech.net.ns2.veerotech.net.ns1.veerotech.net.ns4.veerotech.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
681 ms10%
Speed Index
885 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
684 KB
23 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Bootstrap
Infrastructure
Hosting
VeeroTech Systems LLC

Technology Stack

7 Technologies Detected

CSS Frameworks

2
Bootstrap
Tailwind CSS

Analytics

2
Google Analytics
Segment

Libraries

1
jQueryv1.11.0

Other

1
Modernizr

Web Servers

1
LiteSpeed

SEO Analysis

D52/100
15
10
0
Meta Tags8/15
Content6/12
Headings5/8
Technical13/25
E-E-A-T3/7
Images4/7
Links3/5
URL5/5
Social0/5
Freshness0/4
Mobile2/4
Indexability3/3
O
opencpn.orgopencpn.org

OpenCPN Official Site

Official site of OpenCPN Chart Plotter Navigation software. Thousands of boaters already use OpenCPN as their main navigational tool. You can too. Its open s...

Description truncated.
Title Length21 chars

Recommended: 50-60 chars (~127px / 580px)

Description Length163 chars

Recommended: 120-160 chars

Issues (0)

    10 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    robots.txt

    69 rules

    Allows all crawlers

    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

    F19/100
    Bot Access
    3/25
    Machine Read.
    8/25
    Schema Data
    0/25
    Citation
    8/25

    AI Bot Access

    0/14 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.txtinvalid
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    blockquotes
    Text ratio:8%
    Words:103
    Token eff.:Too Short
    Depth:1/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary27w
    Descriptive Headings
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (10)
    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
    81/100
    13
    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
    11/20
    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
    11/15
    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.
    39/100
    B
    85 mg
    CO₂e / view
    683.5 KB
    Page Weight
    80%
    Cleaner Than
    New Visitor
    97 mg
    vs
    Returning (cached)
    48 mg
    Annual (10K/mo)
    10.1 kg
    Emission Segments
    Data Center
    19 mg
    Network
    20 mg
    Device
    45 mg
    Resource Breakdown
    JavaScript
    51.9 KB
    Images
    3.7 KB
    CSS
    625.4 KB
    HTML
    2.5 KB
    Green Hosting Not Verified
    VeeroTech Systems LLC
    5 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    A

    Security Score

    86%Very Good
    Static / Informational

    HTTPS

    No WAF

    57d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    14.04.2026

    Valid Until

    13.07.2026

    Subject Alternative Names (2)

    *.opencpn.orgopencpn.org

    SHA-256 Fingerprint

    0F:86:62:66:F2:F5:B0:5D:CB:90:60:4D:D5:77:CC:FB:D6:34:BF:6E...

    Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    alt-svc
    h3=":443"; ma=2592000, h3-29=":443"; ma=2592000, h3-Q050=":4...
    content-encoding
    ⚡ Brotli(br)
    content-length
    2265
    content-type
    text/html
    date
    Sat, 16 May 2026 16:27:12 GMT
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    70

    SPF
    DKIM
    DMARC

    MX Records (1)

    opencpn.org

    Domain Information

    opencpn.org

    Domain Age
    17y 2m

    Created

    04.03.2009

    Expires

    04.03.2027

    Last Updated

    07.02.2026

    Registrar

    eNom, LLC

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookiebot

    Cookie Consent Banner
    Cookiebot
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: Cookiebot

    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
    52/100
    Mobile Friendly1 breakpoint
    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, maximum-scale=1
    3 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    Raleway + Lato

    WCAG Partial
    57/100
    Readability
    /30
    22/30

    20px · LH 1.20

    Hierarchy
    /20
    8/20

    1.8x ratio

    WCAG
    /25
    14/25

    1:1 min contrast

    Performance
    /25
    13/25

    2 fonts · 2 req

    Heading Font

    Raleway

    Sans36px

    Body Font

    Lato

    Sans20px

    Contrast Ratio

    1:1

    7 issues

    Reading Comfort

    ~34 CPL

    Narrow lines
    36px
    h1
    20px
    p

    ✅ Excellent readability: 20px body text is ideal for all devices.

    ⚠️ Tight line spacing (1.20). Increase to 1.4–1.6 for better readability.

    ⚠️ Partial contrast: 7 elements below WCAG AA threshold (min 1.0:1).

    ❌ Broken heading hierarchy: 3 level skip(s). Screen readers rely on sequential headings (h1→h2→h3).

    ✅ Lean font stack: 2 font families keeps load times fast.

    ⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

    Buy on MyFontsFlesch 54

    Color Palette

    12 unique colors
    17.03:1 AAA Light
    #ffffff
    Background· 28.4%
    #1c1c1d
    Text· 6.6%
    #45556b
    Primary· 14.1%
    #698dc0
    Secondary· 11.3%
    #65396b
    Secondary· 8.1%
    #30373d
    Secondary· 5.4%
    #5c6b7f
    Secondary· 4.3%
    #ece5dd
    Secondary· 4.1%

    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

    12 Resources

    8
    Scripts
    4
    Styles
    1
    Async
    0
    Defer

    Top Script Sources

    OpenCPN(4)google-analytics.com(1).(1)cdnjs.cloudflare.com(1)ajax.googleapis.com(1)

    Website Identity

    opencpn.org

    17 years old
    Location detected: 🇺🇸 United Statesvia ip
    eNom, LLCen

    Sponsored

    Last analyzed: 16 May 2026 at 16:27

    Historical Analysis & Change Tracking