Indonesian is spoken by about 255 million people, most of whom learned it as a second language.
On our measured language map, its closest relatives are Malay, Betawi and Minang. If you speak one of those, much of the vocabulary will feel familiar from day one.
Every lesson is built from 2,000 real Indonesian 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, 1,437 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 939 hours of study. Read how it works.
Most apps only teach Indonesian 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.