tetr.io

https://tetr.io· First analyzed 16 May 2026· Updated 16 May 2026

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tetr.io

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.26.4.36

Site Location

🇨🇦 Canadavia ip

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

keaton.ns.cloudflare.com.jillian.ns.cloudflare.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

599 ms10%

Speed Index

779 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

17.7 MB

161 requests

Image Optimization

WebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Carrd

Technology Stack

6 Technologies Detected

CSS Frameworks

Analytics

Tag Managers

CDN

SEO Analysis

C63/100

Meta Tags9/15

Content11/12

Headings6/8

Technical11/25

E-E-A-T3/7

Images2/7

Links5/5

URL5/5

Social4/5

Freshness0/4

Mobile4/4

Indexability3/3

tetr.iotetr.io

TETR.IO

Play TETR.IO, the free-to-win online stacker game in the same genre as Tetris. Face off against the world in multiplayer, or claim a spot on the leaderboards!

Title Length7 chars

Recommended: 50-60 chars (~41px / 580px)

Description Length158 chars

Recommended: 120-160 chars

Issues (1)

• Most images missing alt text (142/146) — critical for accessibility and SEO

8 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

2 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

F38/100

Bot Access

20/25

Machine Read.

9/25

Schema Data

0/25

Citation

9/25

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:11%

Words:4,008

Token eff.:Good

Sections/1K:3.5

Structured Data

No Schema

Citation Readiness

Opening Summary19w

Descriptive Headingsavg 1.8w

Canonical URL

Open Graph3/3

Twitter Card2/3

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.

42/100

Passed

Critical

Warnings

Images & Alt Text

5/20

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

Semantic Structure

9/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

5/15

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

7/15

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.

4 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.

35/100

1.83 g

CO₂e / view

17.7 MB

Page Weight

Cleaner Than

New Visitor

2.10 g

Returning (cached)

1.05 g

Annual (10K/mo)

220.1 kg

Emission Segments

Data Center

90 mg

Network

539 mg

Device

1.21 g

Resource Breakdown

JavaScript

659.3 KB

Images

9.5 MB

CSS

109.3 KB

HTML

40.6 KB

Other

7.4 MB

Green Hosting Verified

Cloudflare

GWF Verified

7 recommendations

•Carbon footprint recommendation preview...

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Security Score

35%Critical

Critical / Transactional

HTTPS

WAF

73d

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

29.04.2026

Valid Until

28.07.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

tetr.io*.tetr.io

SHA-256 Fingerprint

70:C7:0C:17:25:09:01:15:DA:F4:AA:68:4D:94:1D:21:28:75:48:61...

Top Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-headers

Authorization, Content-Type

access-control-allow-methods

GET, POST, OPTIONS

access-control-allow-origin

https://ch.tetr.io

access-control-max-age

86400

alt-svc

h3=":443"; ma=86400

cache-control

🟡 0s(public, max-age=0)

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.osk.sh

Domain Information

tetr.io

Domain Age

7y 2m

Created

05.03.2019

Expires

05.03.2029

Last Updated

09.02.2025

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

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.

55/100

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,user-scalable=0,maximum-scale=1,minimum-scale=1

4 recommendations

•Mobile compatibility recommendation preview...

Upgrade to view recommendations

Typography & Readability

HUN

WCAG Partial

53/100

Readability

/30

20/30

18px · LH --

Hierarchy

/20

8/20

1.5x ratio

WCAG

/25

12/25

1:1 min contrast

Performance

/25

13/25

2 fonts · 2 req

Heading Font

HUN

Sans26px

Body Font

HUN

Sans18px

Contrast Ratio

1:1

6 issues

Reading Comfort

~37 CPL

Narrow lines

26px

13px

18px

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

✅ Easy to read: Flesch score 73/100 — accessible to general audiences.

⚠️ Partial contrast: 6 elements below WCAG AA threshold (min 1.0:1).

⚠️ Minor heading issue: 0 level skip(s) detected. Maintain sequential order for screen readers.

⚠️ Weak hierarchy: Headlines should be ≥2x body size for clear visual structure.

❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

Buy on MyFontsFlesch 73

Color Palette

6 unique colors

18.76:1 AAA Dark

#000000

Background· 71.8%

#f2f2f2

Text· 6.1%

#cda1a6

Primary· 5.3%

#615793

Secondary· 3.3%

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

6 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)moon.kagari.moe(1)cdn.xsolla.net(1)(1)

Website Identity

tetr.io

7 years old

Location detected: 🇨🇦 Canadavia ip

NameCheap, Inc.

Social Profiles

X (Twitter)GitHub

Sponsored

Last analyzed: 16 May 2026 at 04:15

Historical Analysis & Change Tracking