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sinistra.net

https://sinistra.net· First analyzed 04 Jun 2026· Updated 04 Jun 2026
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sinistra.net
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Mobile

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Hosting Provider

HL komm Telekommunikationsgesellschaft mbH

IP Address

213.187.93.15

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Leipzig, Germany

ASN

AS16097

Organization

HL komm Telekommunikationsgesellschaft mbH

Server

Apache

Nameservers

a.ns14.net.d.ns14.net.c.ns14.net.b.ns14.net.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
699 ms10%
Speed Index
909 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
295 KB
12 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
HL komm Telekommunikationsgesellschaft mbH

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

1 Technologies Detected

Web Servers

1
Apache

SEO Analysis

C68/100
19
6
0
Meta Tags14/15
Content10/12
Headings6/8
Technical19/25
E-E-A-T0/7
Images4/7
Links3/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
S
sinistra.netsinistra.net

sinistra.net – the online archives of the communist left

Welcome to sinistra.net, the host of the International Library of the Communist Left. This site contains texts in English, French, German, Spanish, Russian a...

Description truncated.
Title Length56 chars

Recommended: 50-60 chars (~335px / 580px)

Description Length178 chars

Recommended: 120-160 chars

Issues (0)

    6 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    1,324 URLs

    robots.txt

    13 rules

    Sitemap reference found

    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

    F38/100
    Bot Access
    20/25
    Machine Read.
    13/25
    Schema Data
    0/25
    Citation
    5/25

    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:62%
    Words:1,023
    Token eff.:Optimal

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary11w
    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...
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    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
    74/100
    10
    Passed
    3
    Critical
    0
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    14/20
    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.
    61/100
    A+
    37 mg
    CO₂e / view
    295.3 KB
    Page Weight
    90%
    Cleaner Than
    New Visitor
    42 mg
    vs
    Returning (cached)
    21 mg
    Annual (10K/mo)
    4.4 kg
    Emission Segments
    Data Center
    8 mg
    Network
    9 mg
    Device
    20 mg
    Resource Breakdown
    JavaScript
    11.6 KB
    Images
    165.2 KB
    CSS
    113.4 KB
    HTML
    5.1 KB
    Green Hosting Not Verified
    HL komm Telekommunikationsgesellschaft mbH
    3 recommendations
    • •Carbon footprint recommendation preview...
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    B

    Security Score

    71%Good
    Static / Informational

    HTTPS

    No WAF

    33d

    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

    Valid From

    09.04.2026

    Valid Until

    08.07.2026

    Subject Alternative Names (2)

    sinistra.netwww.sinistra.net

    SHA-256 Fingerprint

    5A:43:CE:D4:5B:55:68:2F:32:58:3F:2B:0C:98:00:2E:F6:41:6F:5B...

    Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    content-encoding
    📦 Gzip(gzip)
    content-length
    4943
    content-type
    text/html
    date
    Thu, 04 Jun 2026 15:12:52 GMT
    etag
    "305f-6473d73c2fe40-gzip"
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    45

    SPF
    DKIM
    DMARC

    MX Records (1)

    mail03.loswebos.de

    Domain Information

    sinistra.net

    Domain Age
    27y 6m

    Created

    03.12.1998

    Expires

    02.12.2026

    Last Updated

    27.11.2025

    Registrar

    InterNetX GmbH

    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.
    C
    60/100
    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
    3 recommendations
    • •Mobile compatibility recommendation preview...
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    Typography & Readability

    Reforma2018 + Reforma1918

    WCAG AA
    75/100
    Readability
    /30
    24/30

    18px · LH 1.50

    Hierarchy
    /20
    15/20

    2.45x ratio · ✓ H1→H6

    WCAG
    /25
    22/25

    4.77:1 min contrast

    Performance
    /25
    14/25

    3 fonts · 4 req

    Heading Font

    Reforma2018

    Sans43px

    Body Font

    Reforma1918

    Sans18px

    Contrast Ratio

    4.77:1

    WCAG AA (≥4.5:1)

    Reading Comfort

    ~35 CPL

    Narrow lines
    43px
    h1
    18px
    p

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

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

    ❌ Very complex text: Flesch score 25/100. Consider shorter sentences and simpler words.

    ✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 4.8:1).

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

    ✅ Strong hierarchy: Headlines are 2.5x larger than body text.

    Buy on MyFontsFluid Type (rem)Flesch 25

    Color Palette

    8 unique colors
    2.08:1 Fail Light
    #ffffff
    Primary· 83.10000000000001%
    #b8b2b8
    Other· 2.4%
    #8594a9
    Secondary· 1.7%
    #b4c9cb
    Secondary· 1.6%
    #8da8b3
    Secondary· 1.4%
    #6e5e7b
    Secondary· 1.4%

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    Scripts & Styles

    3 Resources

    2
    Scripts
    1
    Styles
    0
    Async
    0
    Defer

    Top Script Sources

    scr(1)css(1)

    Website Identity

    sinistra.net

    27 years old
    Location detected: 🇩🇪 Germanyvia ip
    InterNetX GmbHen

    Sponsored

    Last analyzed: 04 Jun 2026 at 15:13

    Historical Analysis & Change Tracking