Esperanto is spoken by about 102,000 people, most of whom learned it as a second language. Estimates range from 60,000 fluent speakers to 2 million; this is a mid-low figure.
On our measured language map, its closest relatives are Corsican, Catalan and French. If you speak one of those, much of the vocabulary will feel familiar from day one.
Structurally, verbs usually come before their objects; words are built from many smaller pieces, which our course teaches piece by piece.
Every lesson is built from 2,000 real Esperanto 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, 1,722 patterns so far, and a spaced-repetition quiz teaches it in the order that unlocks the most of the language first. Our measured estimate for reaching conversational level from English is about 852 hours of study. Read how it works.
Most apps only teach Esperanto 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.