teratail.com
teratail【テラテイル】｜ITエンジニア特化型Q&Aサイト
Last scanned Jul 27, 2026, 11:43 AM · 1 view
Overall score
Fair
Summary
teratail（テラテイル）はプログラミングに特化したQ&Aサイトです。実現したい機能や作業中に発生したエラーについて質問すると、他のエンジニアから回答を得ら��… This website uses Next.js hosted on AWS. SEO is fair (70/100) and accessibility is good (80/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
teratail（テラテイル）はプログラミングに特化したQ&Aサイトです。実現したい機能や作業中に発生したエラーについて質問すると、他のエンジニアから回答を得られます。
- United States
- Hosted on AWS
Top issues to fix
10 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEOAdd 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
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
1 cookie without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
+4 more issues — details in the sections below.
SEO
4 issue(s) found
Performance
477 ms
Security
HTTPS & header checks
Accessibility
2 issue(s) found
Organization
Company details published in this site's own structured data.
teratail（テラテイル）はプログラミングに特化したQ&Aサイトです。実現したい機能や作業中に発生したエラーについて質問すると、他のエンジニアから回答を得られます。
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- teratail【テラテイル】｜ITエンジニア特化型Q&Aサイト
- Description
- teratail（テラテイル）はプログラミングに特化したQ&Aサイトです。実現したい機能や作業中に発生したエラーについて質問すると、他のエンジニアから回答を得られます。
- Canonical
- https://teratail.com/
- Language
- Charset
- utf-8
- Viewport
- width=device-width
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AWS
- CDN provider
- —
- IP address
- 18.176.192.115
- ASN
- AS16509 (AMAZON-02 - Amazon.com, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA | — |
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Amazon
- Subject
- teratail.com
- Valid from
- Nov 25, 2025
- Valid to
- Dec 24, 2026
- Days until expiry
- 150
- SAN domains
- teratail.com, www.teratail.com
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 1 cookie(s) observed
Content & assets
Headings
H1 0 · H2 20 · H3 0
Links
108 internal · 43 external · 0 broken
Images
58 total · 0 missing alt
Scripts / Styles
87 scripts · 8 stylesheets
JS / CSS size
839 KB · 92.4 KB
Page size
72.0 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 18
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Title longer than 60 characters
- Meta description longer than 160 characters
- No H1 heading found
- No structured data (JSON-LD) found
Accessibility issues
- No H1 heading found
- Missing <html lang> attribute
Scan details
- Requested URL
- https://teratail.com
- Final URL
- https://teratail.com
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 476 ms
- HTML size
- 72.0 KB
- Redirect chain
- https://teratail.com
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does teratail.com use?
- teratail.com is built with Next.js, Google Analytics, Google Ads.
- Is teratail.com secure (HTTPS)?
- Yes. teratail.com uses TLS 1.3 with a certificate issued by Amazon, valid until Dec 24, 2026.
- Who hosts teratail.com?
- teratail.com is hosted on AWS.
- What is teratail.com's SEO score?
- teratail.com scored 70/100 for SEO in the latest analysis (fair).
- What is teratail.com's overall website score?
- teratail.com has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card