Vocabulary Learning, Reimagined
Every review is a brand-new sentence in real context. Smart scheduling surfaces each word right before you forget.
Three principles that make vocabulary stick for good.
Every review embeds the word in a unique, never-repeated sentence. This forces genuine comprehension instead of pattern-matching.
FSRS-4.5 algorithm targets 90% recall, surfacing words right before they fade. Maximum retention, minimum effort.
TikTok-style card swiping makes vocabulary review feel effortless. Swipe through words as naturally as scrolling a feed.
Swipe vertically to navigate words, horizontally to switch between sentence, translation, and explanation. An addictive study loop.
Swipe vertically to navigate words, horizontally to switch between sentence, translation, and explanation. An addictive study loop.
See what sets Rhythm Word apart.
80,000+ words, spaced repetition, and contextual sentences, all free. Upgrade when you're ready.
Have a question? Here are answers to the most commonly asked questions.
Rhythm Word is a vocabulary learning platform that turns every word into lasting memory with contextual sentences and spaced repetition. Unlike traditional flashcard apps, Rhythm Word embeds every vocabulary item in a fresh sentence tailored to your level and learning scenario. The app uses the FSRS-4.5 spaced repetition algorithm with a 90% target recall rate to schedule reviews at the optimal moment, right before you are about to forget.
Swipe vertically to navigate words, horizontally to switch between sentence, translation, and explanation. An addictive study loop designed for mobile-first learning. The gesture-based interface makes vocabulary review feel effortless and engaging, turning study sessions into a natural scrolling experience similar to social media feeds.
Every word is embedded in sentences tailored to your scenario, with bilingual translations and usage explanations. Each sentence is created specifically for you and used exactly once. When you review a word tomorrow, you will see a completely new sentence in a fresh context, forcing genuine comprehension rather than pattern matching.
After each session, your words are woven into a coherent article so you see them in real-world context, not isolation. This approach reinforces vocabulary through narrative comprehension, helping you understand how words naturally connect and flow together in authentic writing.
Powered by the FSRS-4.5 algorithm with 90% target recall. Optimal review times are scheduled automatically based on the Ebbinghaus forgetting curve. The algorithm predicts where you sit on the forgetting curve and surfaces a word just before it would fade, spacing reviews farther apart as mastery grows. This maximizes memory retention while minimizing study time.
Choose from 12 built-in scenarios like Business, Travel, IELTS, TOEFL, Academic, and Daily Life, or create your own to shape every sentence. Within each scenario, Rhythm Word prioritizes the collocations and usage patterns that matter most, so you learn how words actually behave in the contexts where you need them.
GitHub-style contribution heatmap, memory retention curves, review forecasts, and detailed daily analytics. Track your learning streak, review accuracy, and vocabulary growth over time with comprehensive visual dashboards that motivate consistent study habits.
Today's word, daily progress, and learning streak. Right on your home screen without opening the app. The iOS widget keeps your vocabulary learning visible and accessible, encouraging daily engagement with minimal friction.
Rhythm Word supports vocabulary learning across multiple languages including English, Spanish, French, Chinese, Japanese, and Korean. Each language comes with culturally relevant scenarios and sentences that reflect natural usage patterns in that language.
Rhythm Word opens every review with a fresh sentence in real-life context, then schedules the next appearance with a science-backed spaced-repetition algorithm proven to strengthen long-term recall. Unlike traditional flashcard apps that show the same static card repeatedly, every encounter with a word in Rhythm Word is unique.
The algorithm predicts where you sit on the Ebbinghaus forgetting curve and surfaces a word just before it would fade, spacing reviews farther apart as mastery grows. This maximizes memory while minimizing study time. Rhythm Word uses the FSRS-4.5 algorithm, a modern research-backed approach to scheduling reviews at the optimal moment.
Yes. The sentences draw from real-world sources like Twitter and Reddit so you meet the acronyms, memes, and cultural references people use today. The sentences reflect authentic, contemporary language use rather than textbook examples.
Absolutely. The system continuously gauges your performance and rewrites future sentences inside your personal growth zone, just as adaptive-learning research recommends. As you improve, the sentences become more sophisticated and closer to the language real people actually use.
All learning data are encrypted at rest, never sold, and processed under GDPR-aligned policies. Your progress stays yours. We take privacy seriously and do not share your personal information with third parties.
Rhythm Word is available on iOS and as a Chrome browser extension. The extension highlights words you have learned as you browse the web and shows definitions on hover. Download Rhythm Word from the App Store or install the Chrome extension to get started.
Start for free and get a feel for our core reviews. When you are ready to go pro, a single subscription unlocks unlimited sentences, deep-dive analytics, and priority support.
