Posting for a friend:

Download at https://sa.yso.app/stanford to join Sayso @ Stanford.

Sayso uses interactive short stories and phone calls to teach you Spanish like a native speaker. After every lesson new vocabulary and concepts are added to your Flashcard stack that you can practice using an FSRS5-powered Flashcards trainer (most efficient learning algorithm). Join the exclusive Stanford league and win prizes, such as $50 Amazon gift cards every week for your performance!