The Scale Paradox: Why 500M Users Make Duolingo Unbeatable
Duolingo's 12x advantage over Babbel isn't about features - it's about data network effects. Here's what 15 years of scaling learning platforms taught me about competitive moats.
Duolingo is Not a ‘Real’ Language Learning App… Is It?
A LinkedIn PM's 1000-day streak couldn't help her talk to a 7-year-old. Here's why the critics of Duolingo are missing the real point about language acquisition.