Spaced repetition: it shows each card right before you are likely to forget it.

Two subtitle tracks on YouTube and Netflix, with clickable words and line by line replay.

A pronunciation dictionary recorded by native speakers, region by region.

An open collection of example sentences with translations, built by volunteers.

Fill the missing word in thousands of real sentences.

Declensions, etymology, regional usage, in more languages than any commercial dictionary.

The American diplomatic service language courses, released into the public domain.

Unlimited patient practice, if you tell it exactly what to do.