1. Forum
  2. >
  3. Topic: Troubleshooting
  4. >
  5. Duolingo's algorithms


Duolingo's algorithms

Can someone explain to me why Duolingo's algorithms say I'm weak on a ton of words that I KNOW well?

March 21, 2020



It's a known bug that's been around for quite some time. Those words do not respond to practice, so there's nothing you can do to strengthen them. You'll find a bunch of threads addressing this issue if you search the forum for 'dead words'.


"Spaced repetition: Duo offers 3 kinds (all faulty), and word strength is still broken 6 years later": https://forum.duolingo.com/comment/35800727


In addition, Duolingo can only keep track of what it knows about, so if you are using other resources or took Spanish before you started on Duolingo, you may know much more than Duolingo gives you credit for.

Learn a language in just 5 minutes a day. For free.