What technology does slither.io use?

slither.io is built with PHP, Google Analytics.

Is slither.io secure (HTTPS)?

slither.io did not present a valid TLS certificate at the time of the last scan.

Who hosts slither.io?

Hosting provider information for slither.io is not available yet.

What is slither.io's SEO score?

slither.io scored 65/100 for SEO in the latest analysis (fair).

What is slither.io's overall website score?

slither.io has an overall SiteGraph score of 63/100, combining SEO, performance, security, and accessibility.

slither.io

Last scanned Jul 26, 2026, 9:46 AM

Overall score

Fair

Summary

The most famous slither game in the world! Play with millions of players around the world and try to become the longest of the day!. This website uses PHP behind Cloudflare CDN. SEO is fair (65/100) and accessibility is fair (50/100). Security scores poor (35/100) and performance excellent (100/100). Top issue: Missing canonical link.

The most famous slither game in the world! Play with millions of players around the world and try to become the longest of the day!

Top issues to fix

13 issues found · 5 high priority

No valid HTTPS/TLS certificate
Security
Serve the site over HTTPS (a free Let's Encrypt certificate works) — browsers mark HTTP sites as Not Secure and Google demotes them.
Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEO
Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

+7 more issues — details in the sections below.

SEO

5 issue(s) found

100

Performance

457 ms

Security

HTTPS & header checks

Accessibility

3 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

The most famous slither game in the world! Play with millions of players around the world and try to become the longest of the day!

Meta tags

Title: slither.io
Description: The most famous slither game in the world! Play with millions of players around the world and try to become the longest of the day!
Canonical
Language
Charset
Viewport: minimal-ui, user-scalable=no, initial-scale=0.7, maximum-scale=0.7, width=device-width
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

PHP Google Analytics

Hosting & CDN

Hosting provider: —
CDN provider: Cloudflare
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

No TLS certificate information available.

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 0 · H3 0

Links

3 internal · 1 external · 4 broken

Images

9 total · 9 missing alt

Scripts / Styles

3 scripts · 0 stylesheets

JS / CSS size

2.6 KB · 3.1 KB

Page size

14.1 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing canonical link
No H1 heading found
No structured data (JSON-LD) found
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://slither.io
Final URL: http://slither.io/?a
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 457 ms
HTML size: 14.1 KB
Redirect chain: https://slither.io → http://slither.io/?a

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does slither.io use?: slither.io is built with PHP, Google Analytics.
Is slither.io secure (HTTPS)?: slither.io did not present a valid TLS certificate at the time of the last scan.
Who hosts slither.io?: Hosting provider information for slither.io is not available yet.
What is slither.io's SEO score?: slither.io scored 65/100 for SEO in the latest analysis (fair).
What is slither.io's overall website score?: slither.io has an overall SiteGraph score of 63/100, combining SEO, performance, security, and accessibility.