Duolingo
Duolingo
Duolingo, Inc. is a Pittsburgh-based education technology company whose mission is to develop the best education in the world and make it universally available. Luis von Ahn and Severin Hacker founded Duolingo in 2011, initially focusing on making language learning free, effective, and accessible through smartphones and the web. The company built its learning model around short lessons, gamification, personalized practice, experimentation, and a freemium business model that allows users to study without paying while offering optional paid subscription tiers.
Language learning remains Duolingo’s largest business, but the company has expanded significantly. The Duolingo platform now includes language courses, Math, Music, and Chess, while the separate Duolingo English Test provides an online English-proficiency examination for students applying to universities and other institutions. By the end of 2025, Duolingo reported 52.7 million daily active users, 133.1 million monthly active users, and 12.2 million paid subscribers, while more than 6,100 institutions accepted the Duolingo English Test. The English Test site now reports acceptance by more than 6,500 institutions worldwide.
Duolingo became publicly traded on Nasdaq in July 2021 under ticker DUOL. Luis von Ahn remains Co-Founder and Chief Executive Officer. The company has grown to more than 850 employees and continues to invest heavily in artificial intelligence, course expansion, learning science, engagement, and premium subscription features. In 2026, management has emphasized improving the free learning experience, expanding Math, Music, and Chess, and increasing proficiency levels across major language courses.
Duolingo, Inc.
5900 Penn Avenue
Pittsburgh, PA 15206
United States
Current Duolingo materials and corporate filings identify Pittsburgh as the company’s headquarters. Duolingo’s corporate and privacy materials continue to use 5900 Penn Avenue as the principal U.S. address.
5900 Penn Avenue
Pittsburgh, PA 15206
United States
Duolingo’s headquarters supports executive management, engineering, product design, learning science, marketing, finance, legal, investor relations, data, artificial intelligence, and other corporate functions.
Duolingo also maintains other offices, including a U.S. presence in Los Angeles. However, these offices do not replace the official Pittsburgh corporate headquarters.
+1-412-567-6602
Duolingo has published this corporate contact number in its privacy information.
Duolingo does not currently publish one universal phone number for ordinary app, account, or subscription Customer Support.
Customer support is handled through
5900 Penn Avenue, Pittsburgh, PA 15206
5900 Penn Avenue, Pittsburgh, PA 15206
Ordinary app and subscription support is routed through the Help Center rather than one universal support email.
Privacy: privacy@duolingo.com
Investor Relations: IR@duolingo.com
Media: press@duolingo.com
Store Support: store.support@duolingo.com
Copyright: abuse@duolingo.com.
Education Technology, Language Learning, Mobile Learning, AI, Digital Education and Language Assessment
2011
850+ employees
Duolingo’s current strategy materials describe a workforce of more than 850 employees.
At Q4 2025
52.7 million daily active users
133.1 million monthly active users
12.2 million paid subscribers.
Duolingo does not publish public walk-in headquarters hours.
https://investors.duolingo.com/
The Duolingo app provides free courses in a broad range of languages through short, gamified lessons. Users study vocabulary, grammar, listening, reading, writing, pronunciation, and increasingly speaking through adaptive exercises and AI-supported learning features.
English is one of Duolingo’s largest learning categories globally. Courses are available for speakers of many different languages and are important to the company’s strategy because English learners account for a significant portion of the worldwide language-learning market.
Spanish is one of Duolingo’s most popular courses for English speakers. Current Duolingo course data shows tens of millions of learners studying Spanish through the platform.
Duolingo provides French instruction across multiple proficiency levels with vocabulary, grammar, listening, speaking, and reading exercises.
German courses provide progressive instruction through Duolingo’s learning path and are among the company’s major language offerings.
Duolingo offers Japanese for English speakers with instruction covering writing systems, vocabulary, grammar, listening, reading, and other core skills.
The Korean course teaches reading, vocabulary, grammar, listening, and other skills through Duolingo’s mobile-learning system.
Duolingo provides Simplified Chinese courses for eligible learners, combining character recognition, vocabulary, listening, pronunciation, and interactive exercises.
Duolingo Math brings the company’s gamified lesson structure to mathematics. The program has expanded to include material covering algebra, geometry, statistics, and other topics, including dozens of newer units for middle-school and early high-school level learners.
Duolingo Music teaches foundational music concepts through interactive exercises. The course has expanded to support real-piano practice and offers beginner-focused instruction designed to build note recognition, rhythm, and keyboard familiarity.
Duolingo launched Chess as a new learning subject in 2025. Lessons begin with basic piece movement and gradually introduce strategy through interactive practice built around the Duolingo Method.
Super Duolingo is a paid subscription tier offering benefits such as an ad-free experience and additional learning conveniences. Duolingo uses the subscription to monetize a portion of its large free learner base while continuing to make core learning content available without a hard paywall.
Duolingo Max is the company’s higher premium subscription tier. It incorporates AI-powered features such as Video Call, Explain My Answer, and Roleplay, giving learners additional conversational and interactive practice.
Video Call uses AI to provide interactive conversation practice with Duolingo characters. The feature is designed to give learners more speaking practice without requiring a live human tutor.
Roleplay creates AI-powered conversation scenarios that allow users to practice language in contextual situations.
Explain My Answer gives eligible premium subscribers additional explanations about mistakes and language concepts.
The Duolingo English Test is a digital English-proficiency examination that can be completed online rather than at a physical testing center. The current test process takes about one hour, results are generally available within two days, and scores can be shared with participating institutions.
Duolingo offers tools for educators who want to incorporate language learning into classroom instruction and monitor student activity.
Duolingo ABC is an educational product focused on early literacy and reading skills for children.
Duolingo operates an online merchandise store offering branded products associated with Duo and other Duolingo characters.
Store support
store.support@duolingo.com.
+1-412-567-6602
This number is published through Duolingo privacy materials.
+1-412-567-6602
+1-412-567-6602
+1-412-567-6602
This should be treated as a corporate/privacy contact rather than a guaranteed app Customer Support call center.
Duolingo does not publicly list a universal app or subscription Customer Service phone number.
Use
No verified universal phone number is currently published.
No universal public technical-support phone line is listed for standard Duolingo accounts.
Use the Help Center.
No separate public billing telephone number is listed.
For purchases made through Apple or Google, payment and refund processing may be controlled by the applicable app store.
Duolingo English Test provides specialized support rather than a general phone number.
Email: englishtest-support@duolingo.com.
Duolingo does not prominently publish a dedicated IR telephone number.
Email: IR@duolingo.com
800-937-5449
Alternative
718-921-8124
These numbers belong to Equiniti Trust Company, Duolingo’s transfer agent, for shareholder-account matters.
No permanent public press telephone number is prominently listed.
Email: press@duolingo.com
Corporate contact
+1-412-567-6602
Privacy Email: privacy@duolingo.com.
No dedicated copyright phone is publicly listed.
Email: abuse@duolingo.com.
Duolingo does not publish one universal public HR phone number.
No single universal international Customer Service number is published.
Not applicable.
Duolingo does not provide emergency services.
Not applicable.
For ordinary Duolingo app, account, subscription, streak, course, billing, or technical issues, the primary support route is the Duolingo Help Center, not a public call center. Visit https://www.duolingo.com/help, sign into the affected account when possible, and select the support topic that most closely matches your issue. Include the username, account email, subscription type, device platform, transaction date, screenshots, and error message so the support team has enough information to investigate.
For a Duolingo English Test problem, use englishtest-support@duolingo.com or the Help function on the English Test website. Store merchandise issues should go to store.support@duolingo.com, privacy matters to privacy@duolingo.com, investor questions to IR@duolingo.com, and media inquiries to press@duolingo.com. Sending an issue to the specialized channel is more effective than calling the corporate number, which is not presented as a standard consumer-support hotline.
If a subscription was purchased through Apple’s App Store or Google Play, review the app-store purchase record before contacting Duolingo because Duolingo’s Terms state that those platforms control payment and refund processing for purchases made through their respective stores. This distinction is important when the complaint involves a renewal, refund, or subscription charge.
Complaints against Duolingo can involve subscription charges, cancellation, account access, content moderation, technical problems, lost progress, Duolingo Max, the English Test, merchandise, privacy, or other digital services. Before escalating, gather your username, account email, subscription receipt, app-store transaction details, screenshots, device information, previous support responses, and a chronological summary.
Begin with https://www.duolingo.com/help and select the support category related to your issue. Explain what happened, when it occurred, which account was affected, and what resolution you are requesting. Include screenshots and payment receipts where relevant. Because Duolingo does not maintain a universal public customer-service phone line, its Help Center is the correct first-line support route for most app and subscription complaints.
Use the specialized channel when the problem falls outside the ordinary app. English Test complaints should go to englishtest-support@duolingo.com, merchandise issues to store.support@duolingo.com, privacy concerns to privacy@duolingo.com, copyright notices to abuse@duolingo.com, and shareholder matters to IR@duolingo.com. Correct routing can prevent delays caused by submitting a specialized complaint to a team that cannot access the relevant records.
If the initial support response does not address the issue, reply within the existing support thread and request additional review. Provide the earlier case information and explain exactly what remains unresolved. For subscription or transaction disputes, clearly identify the purchase date, subscription tier, transaction source, and requested adjustment. Keeping the complaint within the same written thread helps preserve a complete record of the escalation.
For complaints that require documentation, continue using the Help Center or relevant support email so that screenshots, receipts, correspondence, and other evidence remain attached to the case. If the issue concerns privacy, submit it directly to privacy@duolingo.com. If the complaint involves payment through Apple or Google, also use the applicable platform’s written dispute or refund process because Duolingo may not have authority to reverse those transactions.
For a serious unresolved matter, written correspondence can be sent to Duolingo, Inc., 5900 Penn Avenue, Pittsburgh, PA 15206. Include the account email, username, previous support reference numbers, subscription or transaction details, and a clear description of the resolution requested. Formal letters are most useful when ordinary digital support has failed or when the user needs a durable written record of the complaint.
Duolingo’s current Terms contain a formal dispute-resolution and arbitration process for certain monetary claims. Before initiating arbitration, the claimant must send a written Notice of Claim containing contact information, the basis of the dispute, and the specific relief sought. The Terms also require a good-faith settlement conference before arbitration can proceed. Review the current Terms before sending formal notice because contractual procedures can change.
The appropriate regulator depends on the complaint. Privacy concerns may fall under a state, national, or international privacy regulator. Consumer-protection concerns can be reported to the relevant state Attorney General or consumer agency. Duolingo’s Terms specifically state that California residents may contact the California Department of Consumer Affairs Complaint Assistance Unit at 800-952-5210.
If the complaint concerns a subscription charge, renewal, or payment that cannot be resolved with Duolingo, the user may also have dispute rights through the credit-card issuer, PayPal, Apple, Google, or another payment processor depending on how the purchase was made. Do not assume that a card dispute automatically cancels a subscription. Review the account and platform settings separately and keep confirmation of any cancellation request.
Duolingo’s current Terms require binding individual arbitration for certain disputes seeking monetary relief, subject to the terms, exceptions, and required pre-arbitration process. Arbitration is administered under specified American Arbitration Association consumer rules, while qualifying claims may instead be eligible for small-claims court. Individuals may also have a limited contractual period to opt out of arbitration after first accessing the service. Anyone considering formal proceedings should read the current Terms carefully and obtain legal advice when the dispute is significant.
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