HayaiLearn

HayaiLearn lets you learn Japanese by watching YouTube videos with AI-enhanced subtitles and an instant pop-up dictionary for every word. When you hover or click on a word, you see its most relevant meaning in context, plus grammar breakdowns so you understand how the sentence works. You can save useful sentences, review them later with quizzes, and even track your progress in vocabulary and grammar as you learn.

Key features

• AI-powered subtitles with pop-up dictionary so you can hover or click on any word in the video subtitles to see meanings, context, and grammar details instantly.
• Context-aware explanations and grammar detection that choose the most likely meaning of each word and show grammar notes tailored to the specific sentence.
• Sentence mining and review tools that let you save sentences, add notes, and reinforce learning with video-based quizzes and spaced repetition.
• Personalized video library and albums where you can curate videos you love, import Japanese YouTube videos, and filter examples by your chosen playlists.

​Use cases

• Immersive self-study for Japanese learners who want to replace or complement textbooks with engaging YouTube content while still getting clear explanations.
• Listening and speaking practice through shadowing exercises that let you repeat sentences from clips and receive pronunciation feedback.
• Vocabulary and grammar building by focusing on high-frequency words, tracking known/learning words, and reviewing them with sentence-based quizzes.