LingoDeer is a structured language learning app that guides complete beginners toward an intermediate level through professionally designed courses. Every course is built by language teachers and linguists, covering grammar, vocabulary, listening, speaking, and writing in a sequenced, bite-sized lesson format. The app is available on iOS, Android, and web, with cross-device synchronization available to premium members.

The platform supports 22 language courses including Korean, Japanese, Chinese (Mandarin), French, Spanish (Spain and Latin American), German, Italian, Russian, Portuguese, Vietnamese, Arabic, Thai, Turkish, Greek, Hindi, Indonesian, Malay, Polish, Ukrainian, and English. Each course is developed individually to reflect the unique grammar and script requirements of the target language, with dedicated alphabet modules for scripts such as Hiragana, Katakana, Hangul, and Chinese characters.

Core learning features include grammar notes, listening exercises recorded by native speakers, speaking practice, Stories for contextual reading, a Travel Phrasebook, a Review tab, and Test Out options that allow learners to skip units they already know. Premium members gain access to offline learning and progress backup across devices. Free access is available for alphabet modules, the first unit of each course, all Test Outs, and the Travel Phrasebook.

LingoDeer also offers a separate companion app, LingoDeer Plus, designed for gamified practice across vocabulary, grammar, spelling, listening, and reading comprehension. LingoDeer Plus features 11 interactive games each targeting specific language skills, with sessions kept under 90 seconds to simulate real-life response speed. Both apps operate under separate subscriptions and can be used independently or together.