Overview

Duolingo is a language-learning service with additional courses in chess and math. It best suits learners who want a free, flexible way to build a regular study habit; its short adaptive lessons and offline support are useful strengths, though learners seeking a clearly quantified path to fluency should look elsewhere.

Language study covers reading, writing, listening, and speaking across 40 listed languages. The company describes its teaching methods as research-backed and says its learning works, but those claims are not a guarantee of any particular outcome.

Key features

Short, adaptive lessons: Lessons adjust to the learner’s level and pace. The bite-sized format and reminders can make regular practice easier to fit in, but do not establish how quickly a learner will progress.
Practice tools: Speech practice, placement tests, and personalized review support different stages of study. Offline lessons are also supported, which helps when a connection is unavailable.
More than languages: Chess and math broaden its appeal beyond language learners, while 40 listed languages give language learners a wide choice.
Motivation features: Game-like features and challenges encourage continued study. They may suit learners who respond to prompts and goals, but are not a substitute for choosing a course that fits one’s learning needs.
Related products: Duolingo also offers an English test, school and business products, and subscriptions called Super Duolingo and Duolingo Max. The English test is described as AI-enabled and usable wherever and whenever a test-taker performs best.

Pricing

The free plan costs 0.00 USD per free. That makes Duolingo an accessible starting point for solo learners who want to explore its lessons without paying. Readers who need to compare paid-plan benefits or renewal terms should confirm them before subscribing.

Platforms

Duolingo runs on Android, iOS, macOS, and the web, with mobile apps distributed through the Apple App Store and Google Play. Cloud and mobile deployment suit learners who want to study across devices, and offline lessons add some flexibility away from a connection.

Who it's for

Duolingo is a sensible fit for learners who want brief, adaptive practice, a broad choice of languages, or an entry point that includes chess and math. Its listed company-size fit spans solo users through enterprise, and separate school and business offerings may suit organized learning settings. Those needing a defined learning outcome or detailed paid-plan terms should compare other options before committing.

Pros and cons

Pro: A 0.00 USD per free plan lets learners start without a subscription commitment.
Pro: Adaptation, placement tests, personalized review, and four language skills give learners several ways to structure practice.
Pro: Offline lessons and support for mobile, desktop, and web make it practical for study across settings.
Con: The research-backed positioning does not specify quantified outcomes, so learners cannot use it to estimate their progress.
Con: The paid subscription prices and included features are unclear, making it difficult to judge their value against the free plan.

Alternatives

Choose Talkpal instead if a 10 minute daily limit on a free plan fits your needs, or compare its paid option for unlimited practice with AI modes. Kotrin may suit learners looking for selected lessons, personalized learning, quizzes, and vocabulary practice on its free plan; its Pro monthly plan is 10.00 USD per month, billed monthly. Enverson AI offers a free vocabulary-learning version and an Individual plan at 9.99 USD per month for 1 seat; its Business plan costs 999.00 USD per month for 50 seats. Babbel is a paid alternative with access to all 14 languages on its Individual and Lifetime plans. Cringe is another freemium option. Leximo AI is a freemium option for Android, iOS, and web. Mondly offers freemium access across Android, iOS, macOS, and web, with Premium monthly and yearly plans. For wider browsing, see Language learning apps, AI Language Learning Apps, Reading Apps, Learning Gamification Software, AI Study Tools, and Adaptive Learning Software.

Verdict

Choose Duolingo if you want an accessible starting point for regular, short-form study across languages, chess, or math, with adaptive practice and offline lessons. Its free entry point and broad platform support are compelling; look elsewhere if you need clear paid-plan terms or a specified measure of learning progress.

	Duolingo	MaruMori
Free plan	Yes
Free trial	Yes
Paid from	Free	$0.58/mo
Platforms	Android, iOS, macOS, Web	Web, iOS, Android
Free plan	Yes	Yes
Offline lessons	Yes
Speech practice	Yes
Placement test	Yes
Personalized review	Yes	Yes
Mobile apps	Yes	Yes
Languages offered	40	1
Mobile app coverage	No
Paid from		$6.99/mo

Duolingo vs MaruMori

Duolingo

MaruMori