onlinesim.io

https://onlinesim.io· First analyzed 04 May 2026· Updated 04 May 2026

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onlinesim.io

Mobile

Sponsored

Hosting Provider

Qrator Labs CZ

IP Address

185.104.210.36

Site Location

🇨🇿 Czech Republicvia ip

Server Location

🇨🇿 Prague, Czechia

ASN

AS209671

Server

QRATOR

CDN

Cloudflare

WAF

Cloudflare

Nameservers

evan.ns.cloudflare.com.daisy.ns.cloudflare.com.

Performance

Core Web Vitals

Weight

First Contentful Paint

2.0 s10%

Speed Index

2.6 s10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

225 KB

3 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Qrator Labs CZ

CDN

Cloudflare

SEO Analysis

F29/100

Meta Tags4/15

Content2/12

Headings0/8

Technical14/25

E-E-A-T0/7

Images0/7

Links0/5

URL5/5

Social0/5

Freshness0/4

Mobile1/4

Indexability3/3

onlinesim.ioonlinesim.io

HTTP 403

No description available for this page.

Title Length8 chars

Recommended: 50-60 chars (~49px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description — important for click-through rates in SERPs
• Very thin content (30 words). Search engines need substantial content for ranking.
• Missing H1 tag — every page should have exactly one H1

12 issues found

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Crawlability

Sitemap

Type: standard

2,372 URLs

robots.txt

17 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

F25/100

Bot Access

20/25

Machine Read.

2/25

Schema Data

0/25

Citation

3/25

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:21%

Words:28

Token eff.:Too Short

Structured Data

No Schema

Citation Readiness

Opening Summary12w

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 (11)

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.

66/100

Passed

Critical

Warnings

Images & Alt Text

20/20

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

Semantic Structure

6/20

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.

2 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.

50/100

A+

28 mg

CO₂e / view

225.0 KB

Page Weight

95%

Cleaner Than

New Visitor

32 mg

Returning (cached)

16 mg

Annual (10K/mo)

3.3 kg

Emission Segments

Data Center

6 mg

Network

7 mg

Device

15 mg

Resource Breakdown

JavaScript

222.7 KB

HTML

565 B

Other

1.8 KB

Green Hosting Not Verified

Qrator Labs CZ

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

21%Critical

Interactive

HTTPS

No WAF

228d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GlobalSign nv-sa

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

17.11.2025

Valid Until

19.12.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

www.onlinesim.ioonlinesim.io

SHA-256 Fingerprint

9D:8A:61:AA:46:9C:A3:DE:A5:ED:81:8A:20:34:09:DE:95:5E:D7:29...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control

🔴 No Cache(no-cache, no-store, must-revalidate)

connection

keep-alive

content-length

265

content-type

text/html

date

Mon, 04 May 2026 15:11:59 GMT

expires

Good Warning Issue

Email Infrastructure

Yandex Mail

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

mx.yandex.net

Domain Information

onlinesim.io

Domain Age

7y 10m

Created

13.06.2018

Expires

13.06.2032

Last Updated

03.08.2024

Registrar

GoDaddy.com, LLC

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.

59/100

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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Helvetica Neue

WCAG AAA

76/100

Readability

/30

22/30

16px · LH --

Hierarchy

/20

10/20

WCAG

/25

24/25

21:1 min contrast

Performance

/25

20/25

System fonts

Heading Font

Helvetica Neue

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

21:1

WCAG AAA (≥7:1)

Reading Comfort

~37 CPL

Narrow lines

16px

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

✅ WCAG AAA contrast: All text meets 7:1 ratio (min 21.0:1).

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

Color Palette

7 unique colors

9.53:1 AAA Light

#ffffff

Background· 98.19999999999997%

#464547

Other· 0.2%

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Website Identity

onlinesim.io

7 years old

Location detected: 🇨🇿 Czech Republicvia ip

GoDaddy.com, LLC📧 Yandex Mailen

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Last analyzed: 04 May 2026 at 15:12

Historical Analysis & Change Tracking