Duolingo

Duolingo (NASDAQ: DUOL) is a Pittsburgh, Pennsylvania based learning technology company best known for the Duolingo language-learning app, the world's most-downloaded education app, offering courses in more than 40 languages including Spanish, English, French, German, Italian, Portuguese, Japanese, and Chinese. Founded in 2011 by Luis von Ahn and Severin Hacker, Duolingo has expanded its consumer learning footprint beyond languages with Duolingo Math, Duolingo Music, a newly rolled-out Chess course, and Duolingo ABC for early literacy, all delivered through the same gamified, streak- driven mobile experience. The Company also operates the Duolingo English Test, a digital English-proficiency exam accepted by thousands of higher- education institutions, certification programs, and government agencies worldwide as an alternative to TOEFL and IELTS. Duolingo monetizes through Super Duolingo and Duolingo Max subscriptions, in-app advertising, in-app purchases, and Duolingo English Test fees. The company surpassed 50 million daily active users in Q3 2025 and reported 41% revenue growth in Q2 2025. Duolingo does not publish an official public developer API, SDK, or developer portal; integrations with the Duolingo English Test (score-send to institutional CRMs such as Slate) are handled through a private API-key program negotiated directly with accepting institutions. Community- maintained reverse-engineered clients exist against the unofficial https://www.duolingo.com/api/1 surface but are not endorsed by Duolingo.

Duolingo is profiled on the APIs.io network. Tagged areas include Language Learning, Education, EdTech, Mobile Learning, and Gamification.

Duolingo’s developer surface includes GitHub presence, support, YouTube channel, engineering blog, and 20 more developer resources.

🌐 Visit website 📡 Source on GitHub

8.7/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

Language LearningEducationEdTechMobile LearningGamificationLanguage AssessmentEnglish ProficiencyMath LearningMusic LearningEarly LiteracyConsumer AppsSubscription

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 8.7/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 0.0 / 20

Operational Transparency 0.7 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/duolingo: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

GraphQL 1

GraphQL schemas published by this provider.

Documentation 1

Reference material describing how the API behaves

GraphQL

GraphQL

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 2

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Learn 1

Tutorials, courses, talks, and written guidance

YouTube

YouTube

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 7

The organization behind the API

Website

Website

Newsroom

Newsroom

InvestorRelations

InvestorRelations

Careers

Careers

Twitter

Twitter

LinkedIn

Blog

Blog

Scroll for all 7

Other 11

Properties that don't map to a standard resource type

SuperDuolingo

SuperDuolingo

DuolingoMax

DuolingoMax

DuolingoEnglishTest

DuolingoEnglishTest

DuolingoEnglishTestForInstitutions

DuolingoEnglishTestForInstitutions

DuolingoForSchools

DuolingoABC

DuolingoMath

DuolingoMusic

Company

Research

SECFilings

Scroll for all 11

Source (apis.yml)

aid: duolingo
name: Duolingo
description: 'Duolingo (NASDAQ: DUOL) is a Pittsburgh, Pennsylvania based learning technology company best known for the Duolingo
  language-learning app, the world''s most-downloaded education app, offering courses in more than 40 languages including
  Spanish, English, French, German, Italian, Portuguese, Japanese, and Chinese. Founded in 2011 by Luis von Ahn and Severin
  Hacker, Duolingo has expanded its consumer learning footprint beyond languages with Duolingo Math, Duolingo Music, a newly
  rolled-out Chess course, and Duolingo ABC for early literacy, all delivered through the same gamified, streak- driven mobile
  experience. The Company also operates the Duolingo English Test, a digital English-proficiency exam accepted by thousands
  of higher- education institutions, certification programs, and government agencies worldwide as an alternative to TOEFL
  and IELTS. Duolingo monetizes through Super Duolingo and Duolingo Max subscriptions, in-app advertising, in-app purchases,
  and Duolingo English Test fees. The company surpassed 50 million daily active users in Q3 2025 and reported 41% revenue
  growth in Q2 2025. Duolingo does not publish an official public developer API, SDK, or developer portal; integrations with
  the Duolingo English Test (score-send to institutional CRMs such as Slate) are handled through a private API-key program
  negotiated directly with accepting institutions. Community- maintained reverse-engineered clients exist against the unofficial
  https://www.duolingo.com/api/1 surface but are not endorsed by Duolingo.'
type: Index
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
position: Provider
access: 3rd-Party
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/duolingo.png
tags:
- Language Learning
- Education
- EdTech
- Mobile Learning
- Gamification
- Language Assessment
- English Proficiency
- Math Learning
- Music Learning
- Early Literacy
- Consumer Apps
- Subscription
url: https://raw.githubusercontent.com/api-evangelist/duolingo/refs/heads/main/apis.yml
created: '2026-05-25'
modified: '2026-05-25'
specificationVersion: '0.20'
apis: []
common:
- type: VulnerabilityDisclosure
  url: security/duolingo-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/duolingo-domain-security.yml
- type: Website
  url: https://www.duolingo.com
- type: SuperDuolingo
  url: https://www.duolingo.com/super
- type: DuolingoMax
  url: https://www.duolingo.com/max
- type: DuolingoEnglishTest
  url: https://englishtest.duolingo.com
- type: DuolingoEnglishTestForInstitutions
  url: https://englishtest.duolingo.com/institutions
- type: DuolingoForSchools
  url: https://schools.duolingo.com
- type: DuolingoABC
  url: https://www.duolingo.com/abc
- type: DuolingoMath
  url: https://www.duolingo.com/math
- type: DuolingoMusic
  url: https://www.duolingo.com/music
- type: Company
  url: https://www.duolingo.com/info
- type: Newsroom
  url: https://blog.duolingo.com
- type: Research
  url: https://research.duolingo.com
- type: GitHub
  url: https://github.com/duolingo
- type: InvestorRelations
  url: https://investors.duolingo.com
- type: SECFilings
  url: https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0001562088
- type: Careers
  url: https://careers.duolingo.com
- type: Support
  url: https://support.duolingo.com
- type: Twitter
  url: https://twitter.com/duolingo
- type: LinkedIn
  url: https://www.linkedin.com/company/duolingo
- type: YouTube
  url: https://www.youtube.com/@duolingo
- url: graphql/duolingo-graphql.md
  type: GraphQL
- url: https://blog.duolingo.com/rss/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Duolingo

Kin Score

GraphQL 1

Duolingo GraphQL Schema

Security Posture 2

Duolingo Domain Security

Duolingo Vulnerability Disclosure

Resources