- Duolingo is a free app with AI and gamification to learn languages with short lessons.
- Offers over 100 courses in 40+ languages and now includes Math and Music.
- Hybrid model: Free plan with limits and Super Duolingo with benefits and no ads.
- Usage and expansion data: millions of daily users, extensive catalog, and evolving features.
If you're wondering what Duolingo is and why millions of people use it daily , here you'll find a clear and comprehensive explanation: from its origins and methodology to its payment plans, available courses, and latest updates. All compiled and rewritten from reputable sources and websites that currently rank well for this search term on Google.
Beyond the green owl and streaks, Duolingo combines learning science, AI, and gamification to facilitate daily study habits. The platform was born with the purpose of offering free access to language education and, over time, expanded its reach to include math and music , in addition to adding social features, certifications, and a hybrid business model.
What is Duolingo and what is it for?
Duolingo is a free online language learning platform and app , with a desktop web version and apps for iOS, Android, and a legacy Windows Phone version. It was created by Luis von Ahn (Guatemala) and Severin Hacker , and launched on November 30, 2011. The core idea: short, game-like lessons that help build vocabulary, grammar, pronunciation, and listening comprehension without requiring long sessions or extensive theoretical texts.
For Spanish speakers, Duolingo offers courses in English, French, German, Portuguese, Italian, Catalan, Swedish, and Russian , among others. For English speakers, the catalog is even broader, encompassing languages such as Chinese, Japanese, Korean, Dutch, Danish, Norwegian, Turkish, Hebrew, Irish, Ukrainian, Polish, Greek, Indonesian, Hungarian, Romanian, Latin, Welsh, Scottish Gaelic, and even special languages like Klingon, High Valyrian, and Navajo . Over time, the ecosystem has grown to include more than 100 courses in over 40 languages.
In addition to learning, Duolingo made the leap to official English certification with its online exam. It has also incorporated products and programs for the educational sector, social integration initiatives, and product experiments (some of which remain and others were discontinued after testing).
Method, operation and gamification
At the heart of Duolingo is self-directed, progressive learning , with short lessons and varied exercises: translations, multiple choice, dictation (transcribing what you hear), and phrase repetition to work on pronunciation. Each module focuses on a topic (for example, food, places, adverbs, or phrases ), and upon completion, the user earns points, gems, and achievements that unlock new units.
The app uses "memory full" graphs to visualize mastery per unit, and includes tables or links to compare progress with others. The platform operates on a 1:1 model : the machine teaches and adapts continuously, refining the method based on usage data. While the practice is very useful, the community and users themselves emphasize that to improve real-world conversational skills, it's advisable to supplement it with online educational resources such as reading, audiobooks , movies with closed captions, or dictionaries like WordReference.
Pedagogically, Duolingo declares an approach aligned with international standards (CEFR/CEFR) and five principles: 1) learning by doing (interactivity and learning science), 2) personalization with AI , 3) prioritizing essential content , 4) gamification to maintain the habit, and 5) a fun experience that builds confidence. This mix aims to make daily study a sustainable habit.
Gamification goes far beyond streaks. Duolingo built a universe of characters with distinct personalities , including Duo the owl and Lilly , who serve as reminders and emotional hooks. Their viral videos have strengthened the brand, and in recent years they've enhanced integrated conversation tools so users can practice speaking without pressure.
In fact, on September 24, 2024, the company shared that, with AI support and through a subscription , it would be possible to access an educational activity involving dialogue with characters via video call . And in May 2025, it announced an “ AI-first ” shift , further prioritizing AI and communicating changes to its work structure that generated controversy on social media and led to some users uninstalling the app.
Languages, popularity and usage data
According to publicly available data and listings, English is the most studied language on the platform. In a 2016 survey of 120 million users in 194 countries, English was the top choice in 116 countries ; French in 35; Spanish in 32; German in 9; and Swedish in 1. As a second choice, French led in 77 countries, followed by Spanish (57), German (29), English (13), and Swedish (1). In terms of users (May 2020), the approximate figures were 84,06M (English), 34,57M (Spanish), 23,15M (French), 13,38M (German), and 1,51M (Swedish).
During the COVID-19 pandemic, the student base grew by more than 30 million , with a particular surge in Asian languages such as Hindi, Korean, Japanese, and Chinese . A subsequent count revealed that the distribution by interest showed that 53% were studying English (especially in Latin America, the Middle East, and Southeast Asia), 17% Spanish (very strong in the United States, the United Kingdom, and Norway), and 11% French (with a significant presence in Africa).
A comprehensive list of popularity by language showed, among others, English (267,74 million) , Spanish (70,91 million) , French (50,56 million) , German (34,4 million) , Japanese (32,82 million) , Italian (27,99 million) , Korean (24,8 million) , Mandarin Chinese (16,35 million) , and Portuguese (14,31 million) , with a total of approximately 620.849.000 users across all courses. This data comes from publicly available listings updated in April 2025 and reflects courses for both Spanish and English speakers.
Not all languages offer a symmetrical range of courses. In some, only English courses are available (for example, Czech, Greek, Hindi, Hungarian, Polish, Romanian, Thai, Tamil, Ukrainian, and Vietnamese, among others). There are also discontinued courses in certain language pairs, such as Esperanto for Spanish speakers or Guarani in previous years. In any case, the catalog changes over time with new priorities and ongoing maintenance.
It's worth remembering that, while it's possible to progress very quickly in related languages (for example, Romance languages for Spanish speakers ), users themselves recommend 30-60 minutes of daily practice and supplementing it with external materials to develop real oral and communicative competence. Duolingo alone does not replace human interaction for fluent speaking.
History, milestones and related products
Since its launch in 2011, Duolingo has iterated on many projects. In 2013, it introduced the Language Incubator , an initiative for bilingual volunteers to help create courses. The incubator accelerated expansion and helped preserve minority languages (e.g., Latin, Xhosa, or Basque), ultimately supporting more than 40 courses . On December 15, 2023, it was deactivated to focus on the quality and diversity of existing courses.
Another early project was the immersion program , where users translated texts that could then be sold, contributing to the funding. This program was discontinued on January 20, 2017 , making way for newer technologies and products within the ecosystem.
In the area of certifications, on July 22, 2014, Duolingo Test Center was launched . This remote English exam, requiring a camera and microphone, lasts 20 minutes , costs $50 USD , and is scored from 0 to 10. Third-party studies have reported a correlation with the TOEFL iBT . In 2015, the Colombian Ministry of Labor included the test in the "40 First Jobs" program to certify CEFR levels for young people with B1 or higher performance.
For educational settings, Duolingo for Schools was launched in 2015 , a dashboard that allows teachers to track individual student strengths and weaknesses . It has been used in classrooms and public pilot programs (for example, in Costa Rica and Guatemala ), and has served as a complement to formal instruction.
There were also experimental releases such as Duolingo Bots (2016, iOS; later discontinued without notice), Duolingo Clubs (2016, later replaced by leagues ), and Duolingo Labs (2017), a showcase of projects in testing that could disappear at any time. Within Labs, Stories and Events stood out for English speakers . Stories offered three sets of 30 stories read aloud with comprehension questions; after every 10 stories with 3 stars , the next set was unlocked. Events invited users to meet up to practice languages.
Duolingo categorizes its courses by development phases : “ incubating ” (newly launched), “ beta ” (test version with bug reports), and “ stable ” (mature course, though always improvable). This labeling helps you understand the level of polish and what to expect in each language combination.
Since 2023, the app has broadened its focus: in addition to languages, it has introduced courses in Mathematics and Music . In mathematics, the offerings range from multiplication, fractions, and geometry to mental arithmetic with "Brain Training" -style activities for adults; in music, users learn to read sheet music and play songs using an on-screen keyboard, step by step. It is argued that these areas foster positive habits and are useful for both children and adults.
In terms of corporate figures, Duolingo has been a commercial success. In 2018, it reported $36 million in revenue; by 2020, it had raised $148,3 million in funding (with investors like Ashton Kutcher ). In 2023, revenue reached $531 million , and the forecast for 2024 was $731 million . It is often cited that around 8% of users pay for a subscription and contribute approximately 80% of revenue , while the vast majority use the free, ad-supported version.
In terms of product and brand, the company reports 34 million daily users , approximately 100 million monthly users , 850 employees , and offices in Detroit, Seattle, Berlin, Beijing, New York , and its headquarters in Pittsburgh , where they even launched Duo's Taqueria . In October 2024, its market capitalization was around $12.270 billion USD , significantly higher than in 2022.
The founder, Luis von Ahn , is known for developing technologies like CAPTCHA and reCAPTCHA (acquired by Google in 2009), and has stated that access to quality education was his motivation: keeping Duolingo free to expand opportunities. Over time, they have opted for a hybrid model : free access with ads and gamified extras, and a paid subscription with benefits.
The brand relies heavily on word-of-mouth marketing. Even figures like Bill Gates have mentioned trying Duolingo, and the owl memes helped give it a distinct personality. On social media, the blend of humor and "friendly persistence" reinforces motivation , key to getting someone to return every day to practice, even if only for a few minutes.
Regarding the app's interface and languages, Duolingo has offered a long list of options and, over the years, has added and paused specific pairs. Different lists include combinations for German, Arabic, Bengali, Czech, Chinese, Korean, Spanish, French, Greek, Hindi, Hungarian, Indonesian, English, Italian, Japanese, Dutch, Punjabi, Polish, Portuguese, Romanian, Russian, Tagalog, Thai, Tamil, Telugu, Turkish, Ukrainian, and Vietnamese , among others, as well as Haitian Creole, Esperanto, Latin, Hawaiian, Yiddish, and other special projects.
It's also common to find comparisons with other platforms (Busuu, Open English, etc.) and analyses that recommend using Duolingo as a complementary resource . The idea isn't new: the app makes daily practice very easy , but to speak fluently, it's advisable to expose yourself to real-life interactions , adapted readings, and active listening outside the app.
Plans, prices and what the free version includes
You can learn for free with Duolingo. The free plan gives you access to the content, although with operational limitations : 1) limited lives (hearts) , and the lesson restarts if you make too many mistakes; 2) less customizable standard practice ; 3) restrictions on the legendary level ; and 4) ads after lessons. However, you're never required to pay to level up.
The paid version is called Super Duolingo (formerly Duolingo Plus). Its advantages include unlimited lives , personalized practice with customized study plans, unlimited legendary levels , and an ad-free experience . Additionally, the company typically offers a two-week free trial (payment required, and you must cancel within the trial period if you're not satisfied).
Regarding pricing, several references are given: an approximate monthly cost of $12,99 USD (depending on the country) and, in Spain, indicative amounts of €17 per month or €88 per year . There is a Family Plan , with the same features as Super, for sharing with up to 6 users and an approximate price of €120 per year , which is more advantageous than six individual subscriptions.
Beyond the cost, the important thing is to consider whether the extra cost aligns with your goals. For those building a daily habit who prefer not to interrupt sessions due to mistakes, or who want more personalized routines , a subscription can be convenient. If you manage well with the free plan and the ads don't bother you, you can progress without paying.
One last practical point: if your goal is to speak fluently, Duolingo provides a solid foundation and consistency . To improve your conversation skills, supplement your knowledge with graded readers, conversation clubs, series with subtitles , and, whenever possible, practice with other people. This way, you'll get the most out of the app and its agile learning style.
With all of the above in mind, it's easy to see why Duolingo is so popular: a finely tuned blend of methodology, data, and entertainment that makes it simple to open the app daily, reinforce vocabulary, and progress step by step. Its extensive catalog, global usage figures, product evolution (from languages to math and music ), and a model that combines free and premium features explain its traction. Combine this with real-world exposure and other resources, and the result can be especially effective for building your language learning path.
