dartpad.dev

https://dartpad.dev· First analyzed 19 May 2026· Updated 19 May 2026

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dartpad.dev

Mobile

Sponsored

Hosting Provider

Google Cloud Platform

cloud.google.com

IP Address

199.36.158.100

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 Mountain View, United States

ASN

AS54113

Organization

Google LLC

CDN

Fastly

Performance

100

936 KB

21 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Google Cloud Platform

CDN

Fastly

Progressive Web App

PWA ReadyWeb ManifestService WorkerApple Touch Icon

Technology Stack

2 Technologies Detected

Fonts

Google Fonts

Analytics

Google Analytics

SEO Analysis

F23/100

Meta Tags5/15

Content0/12

Headings0/8

Technical6/21

E-E-A-T0/7

Images0/7

Links0/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

dartpad.devdartpad.dev

DartPad

An online Dart editor with support for console and Flutter apps.

Title Length7 chars

Recommended: 50-60 chars (~43px / 580px)

Description Length64 chars

Recommended: 120-160 chars

Issues (3)

• Very thin content (4 words). Search engines need substantial content for ranking.
• Missing H1 tag — every page should have exactly one H1
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

11 issues found

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Crawlability

Sitemap

Type: standard

robots.txt

Local SEO

Local Search Readiness

0/100

Poor

15 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

F26/100

Bot Access

20/25

Machine Read.

6/25

Schema Data

0/25

Citation

0/25

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.txtinvalid

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:0%

Words:3

Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary

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 (12)

AI readiness recommendation preview...

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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.

63/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

3/20

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.

3 recommendations

•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.

65/100

95 mg

CO₂e / view

935.9 KB

Page Weight

80%

Cleaner Than

New Visitor

108 mg

Returning (cached)

54 mg

Annual (10K/mo)

11.3 kg

Emission Segments

Data Center

5 mg

Network

28 mg

Device

62 mg

Resource Breakdown

JavaScript

821.6 KB

Images

2.0 KB

CSS

5.0 KB

Fonts

102.0 KB

HTML

4.9 KB

Other

418 B

Green Hosting Verified

Quis Lab (Plushie App)

GWF Verified

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

83%Very Good

Static / Informational

HTTPS

No WAF

33d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

24.03.2026

Valid Until

22.06.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

dartpad.devpreview.dartpad.dev

SHA-256 Fingerprint

28:D8:E5:E1:B1:EB:7E:B6:68:DE:E9:F8:AB:DD:ED:ED:D9:1A:C2:97...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

alt-svc

h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=864...

cache-control

🟡 1 Hours(max-age=3600)

content-encoding

⚡ Brotli(br)

content-length

4728

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

Domain Information

dartpad.dev

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

44/100

Not 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.

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Times New Roman

66/100

Readability

/30

21/30

16px · LH --

Hierarchy

/20

8/20

WCAG

/25

19/25

Performance

/25

18/25

1 font · 1 req

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

Reading Comfort

Single Family

left aligned

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

✅ Lean font stack: 1 font families keeps load times fast.

✅ Smart font loading: font-display: swap prevents invisible text during load (FOIT).

GGoogle Fonts Buy on MyFonts

Color Palette

1 unique colors

Light

#ffffff

Background· 100%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

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Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

google-analytics.com(1)codemirror(1)ga.js(1)dartpad.dev(1)gstatic.com(1)

Website Identity

dartpad.dev

Location detected: 🇺🇸 United Statesvia ip

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Last analyzed: 19 May 2026 at 21:55

Historical Analysis & Change Tracking