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Assorted Persian books neatly arranged on a shelf

Hardest Language to Learn: Tough Languages Ranked

Hardest language to learn? FSI ranks tough languages to learn for English speakers, plus what makes difficult languages hard and how to study.

Girl studying Mandrin with TONGUES app on desktop

SAT Words Worth Reviewing: High-Frequency Vocab

SAT words that matter most: learn high-frequency SAT words, build a smart sat vocabulary list, and study them in context.

The 40,000-word path to fluency

Educated native speakers recognize somewhere between 30,000 and 50,000 words. Most language apps top out around 6,000.

Learning a language hands-free

Some of the best study time is time you were never going to spend at a desk. TONGUES turns your decks into generated audio playlists.