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duolingo.com looks like a company or service site, is ranked in the top 1,000 sites and was registered in 2010. It is built with Envoy; we found no traces of an AI site builder.

Popularity

Website Traffic Checker

Among the top 1K sites.

A popularity band, not a visit count.

Tranco: #452 · Chrome UX Report: Top 5,000 · Majestic Million: #1,154

Each list, with its date
SourceSaysAs of
TrancoA research ranking that combines several traffic and link sources, published daily.#452list of 7 Oct 2026
Chrome UX ReportRank buckets from Google’s real Chrome traffic, published monthly.Top 5,000Aug 2026
Majestic MillionRanks sites by how many separate networks link to them (links, not visits), published daily. CC BY 3.0#1,154list of 8 Oct 2026

Technology

Tech Stack Checker

Built with Envoy.

  • EnvoyWeb serverShow evidenceHide evidence
    Evidence · response header
    x-envoy-upstream-service-time: 28
    Popular sites using Envoy Is this wrong? Report it
Everything else it uses (20)

Around it: CDN, DNS, Email, Marketing and more.

Business tools can stay listed after a site stops using them.

Trust signals

Website Trust Checker

0 of 7 trust signals found on the home page.

Signals, not a judgement: missing details are common on small, honest sites.

  • Domain registered26 Jan 2010, 16 years agoNoted
  • HTTPSLoads over HTTPS with a valid certificateFound
  • Contact detailsNo email or phone on the home pageNot found
  • Privacy policyNo link found on the home pageNot found
  • TermsNo link found on the home pageNot found
  • Security filterNot blocked by Cloudflare’s security filter and Quad9’s security filterNoted
Every signal we looked at

On the site

  • Contact pageNo link found on the home pageNot found
  • About pageNo link found on the home pageNot found
  • Privacy policyNo link found on the home pageNot found
  • TermsNo link found on the home pageNot found
  • Refund or returns policyNo link found on the home pageNot found
  • Contact detailsNo email or phone on the home pageNot found
  • Company detailsNo company name or address foundNot found
  • Payment providersNone on the home pageNoted
  • TrackersNone found on the home pageNoted

Behind the site

  • Security filterNot blocked by Cloudflare’s security filter and Quad9’s security filterNotedCloudflare’s security filter and Quad9’s security filter
  • Domain registered26 Jan 2010, 16 years agoNoteddomain registry
  • HTTPSLoads over HTTPS with a valid certificateFound
  • Protective settings1 of 6 in placePartly
  • Email protectionProtected against forged emailFoundDNS records

A second opinion on its security setup: Mozilla’s HTTP Observatory grades the site when you open it. Ten checks before you buy · A signal looks wrong? Report it

What it is

Website Summary

Looks like: Company or service site.

In its own wordsDuolingo: Learn Spanish, French and other languages for freeBring the world's most popular language-learning platform to your classroom. No ads, 100% free.

Our reading of the page, medium confidence.

Show evidenceHide evidence
Exhibit 1 · Wikidata
Q124637557: Duolingo Inc, business
Is this wrong? Report it

Who is behind it

  • WikidataDuolingo Inc

Wikidata: Based in Pittsburgh, United States; listed on Nasdaq.

Show evidenceHide evidence
Exhibit 1 · Wikidata
Q124637557: Duolingo Inc
Is this wrong? Report it

Each name is quoted from its source. A brand and the company that owns it often go by different names.

More about it: Wikidata, profiles, AI use, page facts

In Wikidata

  • Duolingo Inc: American educational technology company · business, public company

Wikidata, the free knowledge base behind Wikipedia, lists this domain as the official website of this item. Volunteers write it; each item shows its sources.

AI use

  • AI training: doesn’t ask AI training crawlers to stay away.
  • AI assistants: may read it for the people who ask them.

What its robots.txt and robots tags ask of AI crawlers. Each crawler chooses whether to follow it.

Site name
Not given
Language
English (en)
What it tells search engines
None

Read from what the page says about itself; we haven’t checked whether it’s true.

Built with AI?

AI Website Detector

No AI builder traces found.

Coding tools such as Cursor leave no traces, so this doesn’t mean a person made it.

AI traces: None found

How we know

AI site builders leave traces in the sites they make. We look for the traces of 53 of them and show every match with the line it came from, so you can check it yourself.

We test this on 2,312 sites whose makers we know, and publish what we get wrong.

How we test it · Every builder we know · How to tell if a site was built with AI

Score breakdown

Site Score

69 of 100: some trust signals.

How established and checkable it is; AI traces carry no weight.

69OF 100
TransparencyContact, policies and about page4 / 30
Track recordHow long the domain has existed25 / 25
PopularityIts place in public rankings20 / 20
Security and setupHTTPS and standard protections13 / 15
ConsistencyName, description and what it tells search engines7 / 10
Why each part scored what it did
TransparencyContact, policies and about page4 / 30no contact page link · email and phone not both given · no privacy policy link · no terms link · no payments seen, so no refund policy needed · no about page link
Track recordHow long the domain has existed25 / 25domain registered 16 years ago
PopularityIts place in public rankings20 / 20Top 1K in a popularity list
Security and setupHTTPS and standard protections13 / 15loads over HTTPS · sends visitors to HTTPS · doesn’t insist on HTTPS · protective settings
ConsistencyName, description and what it tells search engines7 / 10site name matches the domain · describes itself · doesn’t tell search engines what it is

A high score isn’t a promise that a business is honest. How the score works.

Domain history

Domain History

Registered in 2010; first archived in 2010.

  1. Domain registeredRDAP
  2. First captured by the web archiveInternet Archive
  3. This scanCheckAnySite

In the web archive: captured in 17 of 17 years · see the first capture

  1. 2010: captured
  2. 2011: captured
  3. 2012: captured
  4. 2013: captured
  5. 2014: captured
  6. 2015: captured
  7. 2016: captured
  8. 2017: captured
  9. 2018: captured
  10. 2019: captured
  11. 2020: captured
  12. 2021: captured
  13. 2022: captured
  14. 2023: captured
  15. 2024: captured
  16. 2025: captured
  17. 2026: captured
Changes, earlier scans and alerts
Since our previous scan
This is our first scan of the site.

How we scanned it

Only from what anyone can see: the site’s public pages and public records.

  • Politely. Our scanner, CheckAnySiteBot, says who it is and follows the site’s robots.txt.
  • With sources. Every fact above says where it came from and when.
  • Without guessing. When we couldn’t check something, we say so.
This scan, in numbers

925 checks on 10 Oct 2026, with version 0.5.0 of our checks and version 1.1 of the score.

How we work · What each version changed · About our scanner

Quick look

Built with AI?

None foundWe found no AI builder traces.

“None found” never means “made by a person”: coding assistants leave no traces.

All the evidence →

Related

Quick look

How popular is it?

Top 1KBy the best of 3 public lists.

  • Tranco#452list of 7 Oct 2026
  • Chrome UX ReportTop 5,000Aug 2026
  • Majestic Million#1,154list of 8 Oct 2026

A popularity band, never a visit count.

The popularity section →

Related

Quick look

What is it built with?

Web server
Envoy

And 20 more around it (CDN, DNS, Email, Marketing), in the section.

Each with its evidence →

Related

Quick look

Which trust signals does it show?

On the site

  • Contact pageNot found
  • About pageNot found
  • Privacy policyNot found
  • TermsNot found
  • Refund or returns policyNot found
  • Contact detailsNot found
  • Company detailsNot found
  • Payment providersNoted
  • TrackersNoted

Behind the site

  • Security filterNoted
  • Domain registeredNoted
  • HTTPSFound
  • Security headersPartly
  • Software versionsNoted
  • NetworkNoted
  • Email setupFound
  • First certificateCouldn’t check
  • DNSSECNot found
  • Certificate authoritiesNot found
  • Security contactNot found

Signals, not a judgement: missing details are common on small, honest sites.

Every signal with its source →

Related

How has it changed? →
Quick look

How does it add up?

69OF 100

Some trust signals. An open formula (v1.1): every point comes from a finding above. AI traces carry no weight.

TransparencyContact, policies and about page4 / 30
Track recordHow long the domain has existed25 / 25
PopularityIts place in public rankings20 / 20
Security and setupHTTPS and standard protections13 / 15
ConsistencyName, description and what it tells search engines7 / 10
Why each part scored what it did →

Related

More sites like this: company or service site

Automated findings from the site’s public home page and public records, as of 10 Oct 2026. They describe what we found, not the people or business behind the site, and they may be incomplete or out of date. This is information, not advice. Terms · Report an error

What this scan can’t tell you
  • Whether the business is real, honest or delivers what it sells.
  • Whether a site was made with AI when no traces were left: coding assistants and hand edits leave none.
  • How many people visit: we show popularity bands from public lists, not visits.
  • Anything beyond the home page as it was at the time of the scan.

Is this your site? Ask for a correction.

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The result describes what we found on 10 Oct 2026, with evidence.

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One scan answers everything: AI traces, popularity, technology, trust signals, how the site describes itself, a score and its history. A quick check only decides which answer comes first. We read public pages as CheckAnySiteBot and follow robots.txt.