公司：duolingo
多邻国（英语：Duolingo；/ˌdjuːoʊˈlɪŋɡoʊ/ DEW-oh-LING-goh）是美国一个语言学习网站及应用程序。该公司以免费增值模式营运：网站及应用程序皆免费使用，但也有提供付费升级版本。
截至2021年6月，多邻国提供了40种语言共106种的语言课程，也有许多语言课程正在开发中。
Behind the metric: how we developed “Time Spent Learning Well”
Duolingo优化学习和增长的关键指标是时间学习良好度（TSLW）。他们通过一系列措施提高TSLW，如优化每日任务的顺序、改变每月挑战的基准、调整XP奖励与学习效果的比例等。他们发现，延长学习时间、增加新内容以及避免学习者疲劳对TSLW有积极影响。Duolingo的目标是帮助学习者实现自己的学习目标，持续改进TSLW有助于实现这一目标。
Dear Duolingo: What's the right level of difficulty?
Are you up for a little challenge? Here's what makes something the right level of difficulty for a learner!
Can I use ChatGPT to practice a new language?
Chatbots promise a lot of exciting things—but do they make good conversation partners?
How a sense of urgency leads to growth at Duolingo
These are the 5 principles that guide Duolingo's growth strategy!
A little spring cleaning: reducing the app size by 20%
Our app size had steadily increased since 2020 at roughly 50MB per year. It was time for some spring cleaning!
How Duolingo uses AI to create lessons faster
Duolingo's human teaching experts are using AI to make new lessons faster than ever!
平原期实现4年内DAU增长4.5倍，Duolingo是如何做到的？
已经有很多产品从 Duolingo 身上汲取了灵感。
Meaningful metrics: How data sharpened the focus of product teams
Our Data Science team developed a growth framework that helped to grow DAUs by 4x since 2019. Let’s explore the path that led us to that framework, aka The Growth Model!
Meaningful metrics: How data sharpened the focus of product teams
Our Data Science team developed a growth framework that helped to grow DAUs by 4x since 2019. Let’s explore the path that led us to that framework, aka The Growth Model!
Interning with Duolingo: bringing our characters to a new dimension
We love our summer interns, and we’re particularly proud of our Thrive Program, an 8-week program that provides second-year students from communities underrepresented in tech the chance to develop their technical skills and experience life at Duolingo.
Our Thrive interns always get to work on incredibly impactful projects, and their work lives on long after they leave! Meet Monica, whose work with the art and design team included bringing a brand-new animation technique to the company!
How Duolingo’s AI Learns What You Need to Learn
The AI that powers the language-learning app today could disrupt education tomorrow.
How does Duolingo evaluate effectiveness?
Duolingo wants their learners to gain the skills they need to communicate in a new language. Here's how they evaluate the app's effectiveness!
Art meets technology: the next step in bringing our characters to life
The Duolingo cast now lip syncs along during your lessons!
Giving our characters voices
Learn more about how we’re creating custom text-to-speech voices for all of our characters.
Building character: How a cast of characters can help you learn a language
We designed a set of characters that our global community of language learners would feel motivated by – and hopefully fall in love with.
The Duolingo CEFR Checker: An AI tool for adapting learning content
This text adaptation task poses a difficult challenge for us in efficiently producing accessible content for learners from many levels—not only for our Stories, but also for Podcasts and other features across Duolingo products. So, we’ve built semi-automated machine learning systems to aid in our content creation process targeting various language proficiencies, as measured by the CEFR standard. In particular, we’ve built the CEFR Checker to help transform and check that content across languages appropriately targets beginner, intermediate, and advanced learners. Today, we’re making this tool available to language educators and the general public as well! Its use and methodology are described in some detail below.