Seikai TV
Learn Japanese through YouTube videos with smart vocabulary extraction
Seikai TV Overview
Seikai TV is an innovative language learning platform that helps users learn Japanese through YouTube videos. It extracts, translates, and organizes Japanese vocabulary from any YouTube video with subtitles, making immersive learning effortless. The tool solves the pain point of constantly pausing videos to look up words by providing an integrated learning system. Designed specifically for Japanese learners, it uses specialized algorithms developed by linguists to accurately process language patterns. Seikai TV is perfect for self-learners, language students, JLPT exam takers, and anyone who wants to learn Japanese through authentic content. The platform supports learning at all JLPT levels (N1-N5) and focuses on vocabulary acquisition through comprehensible input rather than traditional grammar drills.
Seikai TV Screenshot

Seikai TV Official screenshot of the tool interface
Seikai TV Core Features
YouTube Video Integration
Seikai TV allows users to learn from any YouTube video with subtitles or choose from a curated collection of Japanese content. The platform extracts vocabulary in context, making learning more natural and engaging than traditional methods.
JLPT Level Categorization
Every word and video is categorized by JLPT level (N1-N5) using AI. Users can filter content by their current proficiency level, ensuring they're always working with material that's appropriately challenging.
Lexeme Tracking System
Unlike other tools that track lemmas, Seikai TV recognizes all variations and conjugations of words you've learned. This means you won't waste time studying the same core word in different forms.
Spaced Repetition System
The built-in flashcard system uses spaced repetition algorithms to present words at optimal intervals for memory retention. Words are only shown when you're about to forget them, maximizing study efficiency.
Mobile-Optimized Learning
Seikai TV is fully functional on mobile devices, allowing users to study anywhere. The platform syncs progress across devices, so you can switch between desktop and mobile seamlessly.
Furigana Control
Users can hide furigana on words they're studying to advance their kanji reading skills. This feature helps transition from listening comprehension to reading proficiency.
Anki Integration
Vocabularies can be exported to Anki, allowing users to continue their studies with this popular flashcard system while maintaining all the benefits of Seikai TV's vocabulary extraction.
Seikai TV Use Cases
JLPT Exam Preparation
Students preparing for JLPT exams can use Seikai TV to build vocabulary at their target level (N5-N1). The platform's categorization ensures they focus on level-appropriate words while learning them in authentic contexts.
Anime and Drama Learning
Fans of Japanese media can finally understand their favorite shows without constant dictionary lookups. Seikai TV extracts vocabulary from anime, dramas, and variety shows, making entertainment educational.
Classroom Supplement
Teachers can assign YouTube videos as homework with Seikai TV handling the vocabulary extraction. Students arrive to class already familiar with key terms, making classroom time more productive.
Immersion Learning
Learners aiming for fluency can immerse themselves in Japanese content while having Seikai TV systematically build their vocabulary. The tool helps bridge the gap between textbook Japanese and natural speech.
How to Use Seikai TV
Choose a video from Seikai TV's curated collection or paste the URL of any YouTube video with Japanese subtitles. The platform supports both native content and learning materials.
Review the vocabulary extracted from the video. The system highlights words at your current JLPT level, with detailed definitions, examples, and usage notes for each term.
Watch the video with enhanced learning features. You can jump to specific moments where words are used, toggle subtitles, or hide furigana to challenge your reading skills.
Use the spaced repetition system to review vocabulary. The platform tracks which words you know and when you need to review them, presenting flashcards at optimal intervals.