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Save words from real content, understand them in context, and review them at the perfect time.
Our vision
We believe the best way to learn a language is through content you actually enjoy. Not textbooks. Not flashcards without context. Real videos. Real stories. Real conversations. That’s comprehensible input — and it works.
Click any word while watching videos or reading texts
Every word comes with the sentence where you found it, plus translation
FSRS algorithm schedules reviews so you never forget
Features
A complete ecosystem designed around Comprehensible Input and spaced repetition.
Works on YouTube and HDrezka.kim, with experimental Netflix and Coursera support. Our scanner helps surface known vs unknown words before you start watching.
Your progress syncs instantly across desktop, tablet, and mobile.
Schedules reviews at the exact moment you’re about to forget.
Visualize your vocabulary growth with detailed heatmaps and streak tracking.
How it works
Install the LexiSpark Chrome extension to get started. Save words from any website, video, or text instantly.
Install Chrome ExtensionGo to YouTube, Netflix, or any website with content in your target language. LexiSpark works where you already learn.
Click any unknown word to save it instantly. Every word is saved with the full sentence, translation, and audio.
Our FSRS algorithm schedules your reviews at the optimal time. No more forgetting what you learned.
Watch your vocabulary grow. Track comprehensible input percentage and retention rates over time.
Save words from real content, review them with context, and remember them long-term.
The core loop is free forever. Upgrade when you outgrow the daily limit.
Free forever, no card required
For sentence miners and daily learners
One payment for current Pro features
Everything you need to know about LexiSpark.
LexiSpark currently supports 13 learning languages in the web app, and can work with subtitles in many more languages depending on the video platform.
Start free, build vocabulary from real content, and review with science-backed scheduling.