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starlette.dev

https://starlette.dev· First analyzed 22 May 2026· Updated 22 May 2026
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starlette.dev
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Hosting Provider

Cloudflare
cloudflare.com

IP Address

172.67.158.5

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

damon.ns.cloudflare.com.aisha.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
525 ms10%
Speed Index
682 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
166 KB
21 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Technology Stack

7 Technologies Detected

Analytics

3
Google Analytics
Google Analytics 4
Google Tag Manager

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Fonts

1
Google Fonts

CDN

1
Cloudflare

SEO Analysis

C63/100
18
7
0
Meta Tags5/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images4/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
S
starlette.devstarlette.dev

Introduction - Starlette

The little ASGI library that shines.

Title Length24 chars

Recommended: 50-60 chars (~142px / 580px)

Description Length36 chars

Recommended: 120-160 chars

Issues (0)

    7 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    24 URLs

    robots.txt

    21 rules

    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

    F37/100
    Bot Access
    15/25
    Machine Read.
    14/25
    Schema Data
    0/25
    Citation
    8/25

    AI Bot Access

    6/14 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
    code blocksnavheader/footer
    Text ratio:8%
    Words:502
    Token eff.:Optimal
    Sections/1K:12
    Depth:3/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary73w
    Descriptive Headingsavg 1.3w
    Canonical URL
    Open Graph0/3
    Twitter Card0/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (9)
    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
    0
    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
    13/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    4/15
    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.
    81/100
    A+
    17 mg
    CO₂e / view
    166.4 KB
    Page Weight
    95%
    Cleaner Than
    New Visitor
    19 mg
    vs
    Returning (cached)
    10 mg
    Annual (10K/mo)
    2.0 kg
    Emission Segments
    Data Center
    <0.001 g
    Network
    5 mg
    Device
    11 mg
    Resource Breakdown
    JavaScript
    61.2 KB
    Images
    15.0 KB
    CSS
    22.9 KB
    Fonts
    1.5 KB
    HTML
    9.9 KB
    Other
    55.8 KB
    Green Hosting Verified
    Cloudflare
    GWF Verified
    1 recommendation
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    41%Poor
    Interactive

    HTTPS

    WAF

    80d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Google Trust Services

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-256

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2+H3

    Valid From

    13.05.2026

    Valid Until

    11.08.2026

    OCSP Stapling

    Enabled

    Subject Alternative Names (1)

    starlette.dev

    SHA-256 Fingerprint

    75:76:D1:1A:7C:8F:B4:4C:F0:8D:5E:4B:B7:45:DB:CB:86:36:AD:B9...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-origin
    *
    alt-svc
    h3=":443"; ma=86400
    cache-control
    🟡 0s(public, max-age=0, must-revalidate)
    cf-cache-status
    DYNAMIC
    cf-ray🇩🇪 Frankfurt
    9ffe9f580c2ad2ca-FRA
    content-encoding
    ⚡ Brotli(br)
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    45

    SPF
    DKIM
    DMARC

    MX Records (5)

    eforward1.registrar-servers.com
    eforward5.registrar-servers.com
    eforward2.registrar-servers.com
    eforward4.registrar-servers.com

    +1 more

    Domain Information

    starlette.dev

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Data Protection Officer 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.
    C
    67/100
    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
    1 recommendation
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    -apple-system

    WCAG Partial
    81/100
    Readability
    /30
    23/30

    17px · LH 1.80

    Hierarchy
    /20
    17/20

    1.88x ratio · ✓ H1→H6

    WCAG
    /25
    20/25

    4.26:1 min contrast

    Performance
    /25
    21/25

    System fonts

    Heading Font

    -apple-system

    Sans31px

    Body Font

    -apple-system

    Sans17px

    Contrast Ratio

    4.26:1

    2 issues

    Reading Comfort

    ~40 CPL

    Narrow lines
    31px
    h1
    25px
    h2
    17px
    p

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

    ⚠️ Hard to read: Flesch score 32/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 2 elements below WCAG AA threshold (min 4.3:1).

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

    ✅ Modern fluid typography: clamp() with rem units ensures zoom accessibility (WCAG 1.4.4).

    ✅ System fonts: Zero font loading delay — best possible LCP impact.

    GGoogle FontsFluid Type (rem)Flesch 32

    Color Palette

    9 unique colors
    3.03:1 AA Large Light
    #ffffff
    Background· 86.50000000000001%
    #91949d
    Other· 1.4%
    #3f51b5
    Primary· 4.4%
    #edf0fa
    Accent· 3.4%
    #c5c7d6
    Secondary· 2.4%
    #2f3a7c
    Secondary· 0.6%
    #89bb9a
    Secondary· 0.6%
    #474d7c
    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

    7 Resources

    3
    Scripts
    4
    Styles
    1
    Async
    0
    Defer

    Top Script Sources

    .(2)googletagmanager.com(1)

    Website Identity

    starlette.dev

    Location detected: 🇨🇦 Canadavia ip
    en

    Sponsored

    Last analyzed: 22 May 2026 at 20:38

    Historical Analysis & Change Tracking