What technology does theory.co.jp use?

theory.co.jp is built with Django, Nginx.

Is theory.co.jp secure (HTTPS)?

Yes. theory.co.jp uses TLS 1.3 with a certificate issued by DigiCert Inc, valid until Dec 19, 2026.

Who hosts theory.co.jp?

Hosting provider information for theory.co.jp is not available yet.

What is theory.co.jp's SEO score?

theory.co.jp scored 35/100 for SEO in the latest analysis (poor).

What is theory.co.jp's overall website score?

theory.co.jp has an overall SiteGraph score of 71/100, combining SEO, performance, security, and accessibility.

theory.co.jp

Last scanned Aug 24, 2026, 1:23 PM

Overall score

Fair

Summary

This website uses Nginx. SEO is poor (35/100) and accessibility is good (75/100). Security scores excellent (90/100) and performance excellent (90/100). Top issue: Missing <title>.

Top issues to fix

12 issues found · 5 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing title tag
SEO
Add a unique, descriptive <title> tag — it's the single most important on-page SEO element.
Missing meta description
SEO
Add a ~150-character meta description to control your search-result snippet and lift click-through rate.
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 viewport meta tag
Accessibility
Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.
6 cookies without Secure/HttpOnly flags
Security
Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.

+6 more issues — details in the sections below.

SEO

8 issue(s) found

Performance

1.01 s

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.

Technologies

Detected frameworks, languages, and tools.

Django 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 1.3
Issuer: DigiCert Inc
Subject: *.theory.co.jp
Valid from: Jun 4, 2026
Valid to: Dec 19, 2026
Days until expiry: 116
SAN domains: *.theory.co.jp, theory.co.jp

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsEnabled
X-Content-Type-OptionsEnabled
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: none · 8 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

0 scripts · 0 stylesheets

JS / CSS size

0 B · 0 B

Page size

0 B

Robots.txt & Sitemap

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

SEO issues

Missing <title>
Missing meta description
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://theory.co.jp
Final URL: https://www.theory.co.jp/shop/common/createSession?url=http%3A%2F%2Fwww.theory.co.jp%2F
HTTP status: 302
HTTP version: HTTP/1.1
Response time: 1.01 s
HTML size: 0 B
Redirect chain: https://theory.co.jp → https://www.theory.co.jp/ → https://www.theory.co.jp/shop/common/createSession?url=http%3A%2F%2Fwww.theory.co.jp%2F → https://www.theory.co.jp/ → https://www.theory.co.jp/shop/common/createSession?url=http%3A%2F%2Fwww.theory.co.jp%2F → https://www.theory.co.jp/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does theory.co.jp use?: theory.co.jp is built with Django, Nginx.
Is theory.co.jp secure (HTTPS)?: Yes. theory.co.jp uses TLS 1.3 with a certificate issued by DigiCert Inc, valid until Dec 19, 2026.
Who hosts theory.co.jp?: Hosting provider information for theory.co.jp is not available yet.
What is theory.co.jp's SEO score?: theory.co.jp scored 35/100 for SEO in the latest analysis (poor).
What is theory.co.jp's overall website score?: theory.co.jp has an overall SiteGraph score of 71/100, combining SEO, performance, security, and accessibility.