Graph is from Yahoo finance: https://finance.yahoo.com/quote/DUOL/?guccounter=1
Reuters news article: https://www.reuters.com/business/finance/duolingo-prioritizes-user-growth-over-monetization-forecasts-softer-bookings-2026-02-26/
“The language-learning app has spent recent years fine-tuning monetization through more ads and subscription prompts, helping lift bookings per user. But that coincided with slower user growth.” Yes Reuters, that’s called enshittification.
I think HelloChinese was worth it at least for a year, there’s a sale now for CNY, hurry up or wait for the next festival (ie discount).
Anyways Ankidroid is free and very good for its limitations