Every lesson is built from 2,400 real American Sign Language sentences, aligned with their translations word by word and piece by piece, so you always see how the sentence actually works instead of memorizing flashcards. The grammar is discovered from the sentences themselves, 1,217 patterns so far, and a spaced-repetition quiz teaches it in the order that unlocks the most of the language first. Read how it works.
Most apps only teach American Sign Language through English, if they teach it at all. These starting languages already have a built course, and any other published language can be paired on request:
Speaker figures follow Ethnologue and national censuses, rounded. The difficulty estimate is calibrated against U.S. Foreign Service Institute data.