Learn languages from
content you love
Stop memorizing boring textbooks. LexiSpark uses the FSRS algorithm and Dual Coding Theory to help you master vocabulary directly from YouTube, Netflix, and Coursera.
Join 1,000+ active learners
El universo noun, masculine universe, cosmosuniverso
No boring textbooks
Learn directly from the content you already watch. Our extension analyzes subtitles in real-time.
Science-backed retention
Powered by the FSRS-6 algorithm, proven to be 81% more accurate than Anki's SM-2 for memory scheduling.
Always in sync
Create cards on your laptop, review on your phone. Seamless cloud sync across all your devices.
Everything you need to reach fluency
A complete ecosystem designed around Comprehensible Input and spaced repetition.
Turn any video into a language lesson
Works on YouTube, Netflix, and Coursera. Our scanner calculates known vs unknown words before you even start watching.
Review anywhere
Your progress syncs instantly across desktop, tablet, and mobile.
Never forget a word
Schedules reviews at the exact moment you're about to forget.
Track your mastery
Visualize your vocabulary growth with detailed heatmaps and streak tracking.
AI Tutor
Practice conversations using the exact vocabulary you've learned, powered by Gemini 2.0 Flash.
How it works
From watching a video to mastering a language in 5 simple steps.
Install Extension
Add LexiSpark to your browser in one click.
Watch Videos
Go to YouTube or Netflix. We'll analyze the subtitles.
Create Cards
Click any unknown word to save it with context and audio.
Review Smartly
Our FSRS algorithm schedules your daily reviews.
Track Progress
Watch your comprehensible input percentage grow.
Loved by language learners worldwide
"Finally, a tool that lets me learn Spanish from the YouTubers I actually want to watch. The FSRS algorithm is noticeably better than Anki."
"The dual coding with video screenshots and audio snippets makes remembering vocabulary so much easier. Game changer."
Simple, transparent pricing
Start for free, upgrade when you need more power.
Free
Perfect for getting started
- Browser Extension
- Up to 100 flashcards/mo
- Basic FSRS scheduling
- Web app access
Pro
For serious language learners
- Unlimited flashcards
- Advanced FSRS-6 algorithm
- Cloud sync across devices
- Audio & screenshot capture
- Detailed analytics
Lifetime
Pay once, learn forever
- All Pro features
- Early access to AI Tutor
- Priority support
- One-time payment
Frequently asked questions
Ready to learn languages the smart way?
Join thousands of learners who have ditched textbooks for comprehensible input and science-backed retention.
Get Started for Free