TOEFL Core Vocabulary

A 21-day filtering method for TOEFL vocabulary, built into a machine that actually runs it. Not another flashcard app. Accuracy is the whole point: every phonetic transcription is human-verified, and every recording is generated from those transcriptions by a neural voice engine — not your phone's robotic text-to-speech. Heteronyms are recorded separately for each sense, so a word never gets read the wrong way. WHAT'S INSIDE · 2,138 core words across 21 units — the backbone of the whole set, one unit a day · 131 familiar words with rare senses — the ones you "know" and still get wrong · 32 root and affix groups, 121 collocations, 916 topical terms across 21 fields · 2,196 defining words — the minimal vocabulary every gloss is written in · 185 high-scoring essays — full text, annotated, with per-paragraph audio HOW IT WORKS · The 21-day filter: sweep after sweep, drop what you know, keep what you don't. The pile gets thinner every pass. · Spaced review: missed words come back on a forgetting-curve schedule, so you never have to track what's due · Word Radio: word → gloss → example, played continuously. Runs in the background with lock-screen and headphone controls, and through your car stereo — no screen required. · Quiz drills: meaning, sentence cloze, dictation, listen-for-meaning, listen-for-word — plus two translation-based types (recognition and recall) when your interface language carries translations · Synonym matching: tell near-synonyms apart side by side, instead of memorizing each alone · A wordbook that fills itself from whatever you keep missing, and puts it first in review ABOUT THE AUDIO 11,679 clips per voice, in two complete voices — US female and US male. Switch anytime and the very next line comes out in the new voice. Audio downloads unit by unit, so you only fetch what you actually listen to. ABOUT LANGUAGES Every sense carries an English gloss plus Simplified Chinese, Traditional Chinese, Japanese, and Korean translations. The interface follows your system language. ABOUT PRIVACY Fully offline. No account, no sign-up, no network requests from the app itself, and no analytics, advertising, or crash-reporting SDK of any kind. Your progress, wordbook, and settings live on your phone and are deleted with the app. Pronunciation audio is delivered through the App Store's On-Demand Resources; iOS handles that download, and we neither take part in it nor receive anything from it.