What technology does shellcheck.net use?

shellcheck.net is built with jQuery, Apache.

Is shellcheck.net secure (HTTPS)?

Yes. shellcheck.net uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 4, 2026.

Who hosts shellcheck.net?

Hosting provider information for shellcheck.net is not available yet.

What is shellcheck.net's SEO score?

shellcheck.net scored 70/100 for SEO in the latest analysis (fair).

What is shellcheck.net's overall website score?

shellcheck.net has an overall SiteGraph score of 80/100, combining SEO, performance, security, and accessibility.

shellcheck.net

ShellCheck – shell script analysis tool

Last scanned Aug 24, 2026, 1:22 PM · 1 view

Overall score

Great

Summary

ShellCheck is an open source static analysis tool that automatically finds bugs in your shell scripts. This website uses Apache. SEO is fair (70/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing canonical link.

ShellCheck is an open source static analysis tool that automatically finds bugs in your shell scripts.

Top issues to fix

11 issues found · 2 high priority

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.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
Multiple H1 headings found
SEO
Keep a single H1 per page and demote the others to H2/H3.

+5 more issues — details in the sections below.

SEO

5 issue(s) found

100

Performance

484 ms

Security

HTTPS & header checks

Accessibility

1 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.

ShellCheck is an open source static analysis tool that automatically finds bugs in your shell scripts.

GitHub GitHub GitHub GitHub GitHub GitHub GitHub GitHub

Meta tags

Title: ShellCheck – shell script analysis tool
Description: ShellCheck is an open source static analysis tool that automatically finds bugs in your shell scripts.
Canonical
Language
Charset
Viewport: width=device-width, initial-scale=1
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

jQuery Apache

Hosting & CDN

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

DNS records

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

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: vidarholen.net
Valid from: Aug 6, 2026
Valid to: Nov 4, 2026
Days until expiry: 71
SAN domains: babelregex.com, finitecurve.com, linuxatemyram.com, shellcheck.net, vidarholen.net, www.babelregex.com, www.finitecurve.com, www.linuxatemyram.com, www.shellcheck.net, www.vidarholen.net

Security headers

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

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 2 · H2 1 · H3 0

Links

2 internal · 24 external · 3 broken

Images

1 total · 0 missing alt

Scripts / Styles

8 scripts · 2 stylesheets

JS / CSS size

1.1 KB · 17.0 KB

Page size

8.9 KB

Robots.txt & Sitemap

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

SEO issues

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

Scan details

Requested URL: https://shellcheck.net
Final URL: https://www.shellcheck.net/
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 484 ms
HTML size: 8.9 KB
Redirect chain: https://shellcheck.net → https://www.shellcheck.net/

See something wrong on this report? Request a correction

Same technology stack

lucerna-chem.ch

Lucerna-Chem AG

100

wordpressapachegoogle-analytics

safaribooksonline.com

O'Reilly Media - Technology and Business Training

100

apachejquery

RELIANCEJIO-IN - Reliance Jio Infocomm Limited, IN

buderus.com

Buderus - the system expert for HVAC

100

apachejquery

VODANET - Vodafone GmbH, DE

boschtt.net

Home | Bosch Home Comfort Group

100

apachejquery

VODANET - Vodafone GmbH, DE

repsol.es

Repsol: soluciones de energía, luz, gas, movilidad y solar

100

apachejquery

BBIL-AP - BHARTI Airtel Ltd., IN

steep.de

STEEP - THIS WAY UP

100

wordpressapachejquery

IONOS-AS - IONOS SE, DE

Frequently asked questions

What technology does shellcheck.net use?: shellcheck.net is built with jQuery, Apache.
Is shellcheck.net secure (HTTPS)?: Yes. shellcheck.net uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 4, 2026.
Who hosts shellcheck.net?: Hosting provider information for shellcheck.net is not available yet.
What is shellcheck.net's SEO score?: shellcheck.net scored 70/100 for SEO in the latest analysis (fair).
What is shellcheck.net's overall website score?: shellcheck.net has an overall SiteGraph score of 80/100, combining SEO, performance, security, and accessibility.

Top issues to fix

Organization

Meta tags

OpenGraph & Twitter Card

Technologies

Hosting & CDN

DNS records

TLS / SSL certificate

Security headers

Content & assets

Robots.txt & Sitemap

SEO issues

Accessibility issues

Scan details

Related websites

Frequently asked questions