What technology does stellarium-web.org use?

stellarium-web.org is built with Google Analytics, Nginx.

Is stellarium-web.org secure (HTTPS)?

Yes. stellarium-web.org uses TLS 1.2 with a certificate issued by Let's Encrypt, valid until Sep 4, 2026.

Who hosts stellarium-web.org?

Hosting provider information for stellarium-web.org is not available yet.

What is stellarium-web.org's SEO score?

stellarium-web.org scored 55/100 for SEO in the latest analysis (fair).

What is stellarium-web.org's overall website score?

stellarium-web.org has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.

stellarium-web.org

Stellarium Web Online Star Map

Last scanned Jul 26, 2026, 4:17 PM · 1 view

Overall score

Fair

Summary

Stellarium Web is a planetarium running in your web browser. This website uses Nginx. SEO is fair (55/100) and accessibility is excellent (90/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Meta description longer than 160 characters.

Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.

Top issues to fix

10 issues found · 2 high priority

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.
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.
Meta description longer than 160 characters
SEO
Trim the meta description to under 160 characters to avoid truncation in search results.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.

+4 more issues — details in the sections below.

SEO

7 issue(s) found

100

Performance

163 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.

Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.

Meta tags

Title: Stellarium Web Online Star Map
Description: Stellarium Web is a planetarium running in your web browser. It shows a realistic star map, just like what you see with the naked eye, binoculars or a telescope.
Canonical
Language: en
Charset: utf-8
Viewport: width=device-width,initial-scale=1
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Google Analytics Nginx

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 1.2
Issuer: Let's Encrypt
Subject: stellarium-web.org
Valid from: Jun 6, 2026
Valid to: Sep 4, 2026
Days until expiry: 37
SAN domains: stellarium-web.org, www.stellarium-web.org

Security headers

Strict-Transport-SecurityEnabled
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

0 internal · 0 external · 0 broken

Images

0 total · 0 missing alt

Scripts / Styles

4 scripts · 3 stylesheets

JS / CSS size

281 B · 219 B

Page size

2.8 KB

Robots.txt & Sitemap

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

SEO issues

Meta description longer than 160 characters
Missing canonical link
No H1 heading found
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://stellarium-web.org
Final URL: https://stellarium-web.org
HTTP status: 200
HTTP version: HTTP/2
Response time: 163 ms
HTML size: 2.8 KB
Redirect chain: https://stellarium-web.org

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does stellarium-web.org use?: stellarium-web.org is built with Google Analytics, Nginx.
Is stellarium-web.org secure (HTTPS)?: Yes. stellarium-web.org uses TLS 1.2 with a certificate issued by Let's Encrypt, valid until Sep 4, 2026.
Who hosts stellarium-web.org?: Hosting provider information for stellarium-web.org is not available yet.
What is stellarium-web.org's SEO score?: stellarium-web.org scored 55/100 for SEO in the latest analysis (fair).
What is stellarium-web.org's overall website score?: stellarium-web.org has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.