What technology does duolingo.cn use?

We did not detect any specific technologies for duolingo.cn in the latest scan.

Is duolingo.cn secure (HTTPS)?

Yes. duolingo.cn uses TLS 1.3 with a certificate issued by GoDaddy.com, Inc., valid until Nov 20, 2026.

Who hosts duolingo.cn?

Hosting provider information for duolingo.cn is not available yet.

What is duolingo.cn's SEO score?

duolingo.cn scored 70/100 for SEO in the latest analysis (fair).

What is duolingo.cn's overall website score?

duolingo.cn has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.

Has duolingo.cn's score changed over time?

duolingo.cn's overall score has declined by 3 points (from 86 to 83) since Jul 25, 2026.

duolingo.cn

Duolingo

Last scanned Aug 1, 2026, 11:00 AM · 11 views

Overall score

Great

Summary

多邻国是世界上最受欢迎的语言学习平台。免费、有趣、科学。现在就登录 duolingo.com 或手机应用开始学习吧！. SEO is fair (70/100) and accessibility is good (80/100). Security scores good (85/100) and performance excellent (100/100). Top issue: No H1 heading found.

多邻国是世界上最受欢迎的语言学习平台。免费、有趣、科学。现在就登录 duolingo.com 或手机应用开始学习吧！

Top issues to fix

8 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.
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.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

SEO

4 issue(s) found

100

Performance

609 ms

Security

HTTPS & header checks

Accessibility

2 issue(s) found

Score history

-3 overall since Jul 25, 2026

Overall: 83
SEO: 70
Security: 85
Performance: 100
Accessibility: 80

Organization

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

多邻国是世界上最受欢迎的语言学习平台。免费、有趣、科学。现在就登录 duolingo.com 或手机应用开始学习吧！

Meta tags

Title: Duolingo
Description: 多邻国是世界上最受欢迎的语言学习平台。免费、有趣、科学。现在就登录 duolingo.com 或手机应用开始学习吧！
Canonical: https://www.duolingo.cn/
Language
Charset: utf-8
Viewport: width=device-width,initial-scale=1,user-scalable=no
Robots meta: NOODP
Manifest: https://www.duolingo.cn:443/manifest.json

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

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: GoDaddy.com, Inc.
Subject: *.duolingo.cn
Valid from: May 6, 2026
Valid to: Nov 20, 2026
Days until expiry: 110
SAN domains: *.duolingo.cn, duolingo.cn

Security headers

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

Compression: gzip · 6 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

16 scripts · 2 stylesheets

JS / CSS size

4.7 KB · 0 B

Page size

11.2 KB

Robots.txt & Sitemap

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

SEO issues

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

Scan details

Requested URL: https://duolingo.cn
Final URL: https://www.duolingo.cn:443/
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 609 ms
HTML size: 11.2 KB
Redirect chain: https://duolingo.cn → https://www.duolingo.cn:443/

See something wrong on this report? Request a correction

Frequently asked questions

What technology does duolingo.cn use?: We did not detect any specific technologies for duolingo.cn in the latest scan.
Is duolingo.cn secure (HTTPS)?: Yes. duolingo.cn uses TLS 1.3 with a certificate issued by GoDaddy.com, Inc., valid until Nov 20, 2026.
Who hosts duolingo.cn?: Hosting provider information for duolingo.cn is not available yet.
What is duolingo.cn's SEO score?: duolingo.cn scored 70/100 for SEO in the latest analysis (fair).
What is duolingo.cn's overall website score?: duolingo.cn has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
Has duolingo.cn's score changed over time?: duolingo.cn's overall score has declined by 3 points (from 86 to 83) since Jul 25, 2026.