What technology does duolingo.com use?

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

Is duolingo.com secure (HTTPS)?

Yes. duolingo.com uses TLS 1.3 with a certificate issued by Amazon, valid until Dec 24, 2026.

Who hosts duolingo.com?

duolingo.com is hosted on AWS, behind CloudFront CDN.

What is duolingo.com's SEO score?

duolingo.com scored 80/100 for SEO in the latest analysis (great).

What is duolingo.com's overall website score?

duolingo.com has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.

Is duolingo.com hiring?

duolingo.com has a careers page; check it directly for current openings.

duolingo.com

Duolingo

Last scanned Jul 14, 2026, 1:28 PM

Overall score

Great

Summary

This website is hosted on AWS. SEO is good (80/100) and accessibility is good (80/100). Security scores good (75/100) and performance excellent (100/100). Top issue: No H1 heading found.

SEO

2 issue(s) found

100

Performance

851 ms

Security

HTTPS & header checks

Accessibility

2 issue(s) found

Meta tags

Title: Duolingo
Description: Duolingo is the world's most popular way to learn a language. It's 100% free, fun and science-based. Practice online on duolingo.com or on the apps!
Canonical: https://www.duolingo.com/
Language
Charset: utf-8
Viewport: width=device-width,initial-scale=1,user-scalable=no
Robots meta: NOODP
Manifest: https://www.duolingo.com/manifest.json

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider: AWS
CDN provider: CloudFront
IP address: 18.172.64.35
ASN: AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

Type	Value
A	18.172.64.35 18.172.64.84 18.172.64.89 18.172.64.33
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Amazon
Subject: *.duolingo.com
Valid from: Nov 25, 2025
Valid to: Dec 24, 2026
Days until expiry: 163
SAN domains: *.duolingo.com

Security headers

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

Compression: gzip · 5 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

14 scripts · 2 stylesheets

JS / CSS size

636 KB · 26.7 KB

Page size

10.8 KB

Robots.txt & Sitemap

robots.txt: Found
Disallow rules: 25
sitemap.xml: Found
URLs in sitemap: -1

SEO issues

No H1 heading found
No structured data (JSON-LD) found

Careers

View careers page

This company has an active careers page, but individual openings weren't reliably parsed from it — visit the page above for current listings.

Scan details

Requested URL: https://duolingo.com
Final URL: https://www.duolingo.com/
HTTP status: 200
HTTP version: HTTP/2
Response time: 851 ms
HTML size: 10.8 KB
Redirect chain: https://duolingo.com → https://www.duolingo.com/

Frequently asked questions

What technology does duolingo.com use?: We did not detect any specific technologies for duolingo.com in the latest scan.
Is duolingo.com secure (HTTPS)?: Yes. duolingo.com uses TLS 1.3 with a certificate issued by Amazon, valid until Dec 24, 2026.
Who hosts duolingo.com?: duolingo.com is hosted on AWS, behind CloudFront CDN.
What is duolingo.com's SEO score?: duolingo.com scored 80/100 for SEO in the latest analysis (great).
What is duolingo.com's overall website score?: duolingo.com has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.
Is duolingo.com hiring?: duolingo.com has a careers page; check it directly for current openings.