My Duolingo streak is 714 days. I have the obsidian league badge. I've defended my streak from airport lounges, hospital waiting rooms, and once — I'm not proud of this — a wedding reception.
Last month I went to Mexico City for a week. My Spanish was going to be great.
Reader, my Spanish was not great.
I could say "The apple is red." I could ask where the library is. When a waiter asked me something in fast, regional, completely-different-from-app Spanish, I stared at him with the hollow eyes of someone who has completed 700 lessons and retained approximately 40% of them.
Here's the thing: Duolingo isn't lying to you. It will teach you vocabulary. It will teach you basic grammar. What it cannot teach you is language as it actually exists — messy, fast, contextual, full of filler words and slang the app has never heard of.
The app's gamification isn't a bug, it's a product decision. Streaks make you open the app daily. Daily opens generate revenue. That's fine. But it optimizes for consistency, not fluency.
After Mexico, I added italki (find a tutor, talk to a human) and Anki (spaced repetition for vocabulary I actually care about). My Spanish is now actually improving.
My honest ranking after 700 days:
Duolingo got me here. It just can't take me much further.
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