📚 LIBRARY · TOPIC
Duolingo · Library
Duolingo is the world's largest language-learning platform by daily active users, founded in 2011 by Luis von Ahn (Carnegie Mellon University CS professor, also the inventor of CAPTCHA and reCAPTCHA) and Severin Hacker. The platform was launched publicly in 2012 and went public on NASDAQ in July 2021 (NASDAQ: DUOL). As of 2024 Duolingo reports ~110+ million monthly active users with ~37+ million daily active users across 40+ language-learning courses.\n\nThe platform offers free language-learning content (with substantial advertising-supported model) plus paid Super Duolingo subscription (~USD 9.99/month or ~USD 80/year removing ads plus offering unlimited mistakes plus offline-mode), Duolingo Family Plan, plus Duolingo Max (the substantial post-2023 GPT-4-powered subscription tier with AI-conversation-practice and AI-explanation features at ~USD 14.99/month). The substantial post-2020 Duolingo growth has been driven by the gamified-streak-and-XP mechanics plus the substantial Duolingo character-and-mascot (Duo the Owl) cultural-marketing presence plus the substantial post-2022 Duolingo English Test (the substantial post-2020 alternative to TOEFL/IELTS for university admissions accepted by 5,000+ universities globally).\n\nFor a globally-mobile professional, Duolingo provides accessible-and-gamified language-learning infrastructure though the practical-conversation development substantially benefits from supplementary instruction. Indian-learner engagement is substantial particularly for English-language polish among Indian professionals plus the substantial post-2020 Indian regional-language and Spanish/French/German/Mandarin interest. Personal income tax up to 25%; corporate tax 27.5% (Duolingo HQ Pittsburgh).
Library categories most relevant to Duolingo, ranked by topical overlap.
- Library: FTAs
273 Free Trade Agreements documented — qualification, benefits, rules of origin.
Relevance score: 4 - Consulting Firms
MBB + Big-4 + tier-2 consulting presence by city and industry specialization.
Relevance score: 4 - Library: Cities
City intelligence — 2,398 cities across 204 countries with tier-matched depth.
Relevance score: 2 - Library: Countries
Deep factsheets on 197 countries — economic, legal, trade, cultural, logistical.
Relevance score: 2 - Library: Tools
15 free tools — duty calculator, Incoterms picker, FTA eligibility, RoO tester, costing, and more.
Relevance score: 2 - Chambers of Commerce
National chambers — FICCI, CII, ASSOCHAM, USCIB, JETRO, equivalent bodies globally.
Relevance score: 2 - International Banks
Tier-1 international banks by country with correspondent-network depth and expat access.
Relevance score: 2 - Law Firms
Magic Circle, Silver Circle, AmLaw 100, national tier-1 law firms by jurisdiction.
Relevance score: 2 - Library: Arbitration Centers
Complete registry of commercial arbitration centers globally with rules and case caseload.
Relevance score: 2 - Library: Central Banks
Complete list of central banks globally with websites, contact, governance structure.
Relevance score: 2 - Library: Dataset Catalog
Open datasets catalog — World Bank, IMF, OECD, UN, Eurostat, national statistics.
Relevance score: 2 - Library: Speakers Bureaus
Professional speaker bureaus for trade, economics, policy, geopolitics topics.
Relevance score: 2 - SEZ Directory
Special Economic Zones globally — qualifying industries, incentives, locations.
Relevance score: 2 - Library: Corridors
37 major trade corridors — IMEC, BRI, Northern Distribution Network, Pacific trade routes.
- Library: HS Codes
Harmonized System codes 1-97 with sub-heading depth — the primary tariff classification reference.
- Library: Lexicon
Trade and commerce lexicon — precise definitions of the terminology in use.
- Library: Regulators
Global directory of financial, trade, telecom, competition, data, health regulators.
- Library: Sub-Verticals
2,254 sub-verticals across commerce — goods (HS 1-97) and services (GATS/CPC).
- Library: Trade Blocs
28 major trade blocs — EU, ASEAN, USMCA, MERCOSUR, AfCFTA, RCEP, CPTPP.
- Library: Verticals
Industry vertical guides — pharma, agro, textiles, electronics, semiconductors, fashion.
13,940 reference PDFs
The full AJG Library contains 13,940 primary-source reference PDFs across regulations, trade policy, central bank reports, tariff schedules, and more. Browse all →
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