Mostly good, but frustrating
The Duolingo app is good for keeping up with languages. I use it every day for French, Spanish, and German. The frustrating part is that your "fluency" rating is a benchmark of progress, but it is inconsistent: "Youve reached 59% fluency!" (German) only to be down to 56% on the next screen. 12 straight days of doing 4-5 French lessons per day at 32% fluency, only to find Im 31% today. I guess it wants you to go back and redo things, but its just odd to see it drop when youre active. Anyhow, that aside, I like the app and recommend it for improving your language skill.
Jckey7 about
Duolingo Learn Many Languages for Free, v5.1.7