zeroStudy

Content rating
Everyone
10+
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Content rating
Everyone
In-App Purchases
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About this app

zeroStudy helps you learn languages naturally by watching content you love.
HOW IT WORKS
1. Install the zeroStudy browser extension
2. Watch Netflix, YouTube, or any video with subtitles
3. Tap any word to get instant AI-powered definitions — your vocabulary is saved automatically
4. Review your words anytime with the zeroStudy mobile app

THE MOBILE APP
• Reinforce — Smart spaced repetition flashcards with video context
• Review your saved vocabulary on the go
• Track your learning progress
• Syncs with the browser extension and web dashboard

WHY IT WORKS
Traditional language learning relies on memorization and textbooks. zeroStudy follows a natural "bottom-up acquisition" approach — learn through real content, not drills. The same way you naturally picked up your first language.

Free to start. Upgrade to Pro for unlimited vocabulary, AI explanations, and more.
Updated on
Mar 10, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Financial info, and App activity
Data is encrypted in transit
You can request that data be deleted

What’s new

Initial release of zeroStudy — learn vocabulary from YouTube videos with spaced repetition flashcards.