Language-learning app Duolingo makes around $500 million annually, despite offering all of its lessons for free. WSJ explores how the company is using AI and A/B testing to keep users hooked.
Language learning app Duolingo has seen an over 200% spike in U.S. users learning Mandarin "out of spite" as many flee to Chinese app RedNote amid the uncertainty surrounding TikTok's future.
Learn more about my experiences with Duolingo, Babbel and Pimsleur below, including the sign-up process and lesson structure for each one. SKIP AHEAD Get to know the apps | How I tested the ...