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Duiduidui

duiduidui! is the Chinese learning app for people who are serious about it: an adaptive study engine that builds a real mathematical model of your knowledge, a 200,000-entry offline dictionary, an AI tutor, and progress you can share with your teacher.

Education
United States Estimated origin: United States

Added July 13, 2026 · Last analysed July 13, 2026 · via Hacker News · 67% unique tagline

Own this Launch?
Screenshot of Duiduidui

StackScope is a free public catalogue of indie launches. We find launches on Product Hunt, Hacker News and similar feeds, then crawl each site to detect its tech stack and score it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 13 July 2026; the live site may have changed since.

Duiduidui has the basics covered well, with complete legal pages, a thorough launch checklist, and clean crawl signals. Worth fixing first: missing several security headers, tracking cookies set before any opt-in, and incomplete email security.

Launched on Hacker News on July 13, 2026. The site is hosted on AWS S3 and served through AWS CloudFront, with a domain registered in 2025. Our crawler found 11 technologies on this site, covering web fonts, analytics, CDN, and cloud. The stack includes Adobe Fonts, Amazon Web Services, and AWS CloudFront.

It's also running the same core stack as 331 other launches.

If you own this site, refresh the snapshot and see the full fix list any time →

6.8
StackScope Score
Good
88/100 Launch Readiness
Launch ready
0/6 Security Headers
Poor
3/3* Legal
Complete*
2/2 Crawl files
Complete
84/100 Performance
Fast
Vibe Score 0 · No AI signals
How much the site looks AI-generated. Informational pattern-match signal, not a verdict. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (11) · Scale-up stack

Infrastructure
CDN AWS CloudFront
Cloud Amazon Web Services
DNS AWS Route 53
Hosting AWS S3
Email
Business email Google Workspace (2)
Build & Framework
Font Adobe Fonts
Google Fonts
Package CDN jsDelivr (2)
Analytics & Marketing
Analytics Google Analytics (4)
SEO Google Search Console
Tag management Google Tag Manager medium

Infrastructure

Network
AMAZON-02 - Amazon.com, Inc., US
AS16509 · US
DNS
AWS Route 53
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
Green hosting
Not green hosted
No green-energy record. Data from The Green Web Foundation.
SSL Certificate
Amazon
Valid 8 Apr 2026 to 22 Oct 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
1 year
Registered Apr 2025 · Namecheap Inc.

Email Security

✗
SPF Not published. Your domain can be spoofed in phishing emails.
✓
DKIM Detected via known email provider
✗
DMARC p=none None (p=none). Monitoring only.
?
MTA-STS Not deployed. Mail to your domain can be downgraded to plaintext en route.
?
TLS-RPT Not configured. You won't hear about silent SMTP TLS handshake failures.

Storage (2)

Cookies (2)
NameLifetimeDetected as
_ga 1y Google Analytics
_ga_GFJX5XHJ57 1y Google Analytics

Readiness Breakdown How?

✓ Custom title and meta description
✓ Open Graph tags (title, image, description)
✓ Twitter card meta tags
✓ Responsive viewport meta tag
✓ Favicon present
✓ Semantic HTML (nav, main, article)
⚠
Meta description is 252 characters (advisory) Google only shows about 155–160 characters of the description in desktop search results (less on mobile); anything past that won't appear.
- Canonical URL declared

Performance How?

213 ms Server response
69% Faster than peers
1068 ms Largest contentful paint
0.01 Cumulative layout shift
1.3 MB Page weight
609 KB Image weight
5 Third-party domains
0 Console errors
0 Failed requests

⚠ 7 images: 5 oversized, 4 without width/height

Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.

AI Stance

Welcomes AI crawlers
✓ llms.txt published
✓ No AI bots blocked in robots.txt
Content-Signal
? No directive declared
Link headers
? None advertised

Well-Known Files

✓ robots.txt
✓ sitemap.xml (60 URLs)
✗ security.txt
✓ llms.txt
✗ ads.txt
✗ humans.txt

Legal

✓ Privacy Policy
/en/privacy-policy/
✓ Terms of Service
/en/terms-of-service/
? Consent manager not detected
Analytics set tracking cookies on our visit, with no opt-in step.
86% unique
Mentions:
GDPR CCPA Cookies Do Not Sell

Security Headers (0/6)

✗
Referrer-Policy
✗
X-Frame-Options
✗
Permissions-Policy experimental (check browser support)
✗
X-Content-Type-Options
✗
Content-Security-Policy
✗
Strict-Transport-Security
–
X-XSS-Protection deprecated (use Content-Security-Policy)

Build

3 JS files
9 CSS files
5 Third-party domains

Brand Colours

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.