[FalconSensei]

For German I'm using Speakly. What I like about it is that it goes in order of the most used words, and all phrases are actually realistic and something you would use.

There's a streak, but it's so easy to ignore, specially since the app focus on 'learned words', something that duolingo had many years ago. The study is also organized in just chunks of 100. So instead, I focus on how many words I want to learn on the next week/month, or when I'm getting to the next group.