Track problem-solving progress with detailed notes, tags, and complexity metrics. Add multiple solutions and upload screenshots per problem. Filter and search problems efficiently. Visualize progress across 18 topics. Support dark mode interface.
Through interactive lessons and exercises that include reading, writing, and listening. Study 1000 vocabulary with images and native audio. Complete activities and tests for each of 60 topics across 11 worlds.
Study for the U.S. naturalization interview with practice tests, mock interviews, and flashcards. Answer official questions with feedback and progress tracking. Simulate interviews with video prompts and speech recognition.
