For Duolingo (app version) expats who are willing to pay ~$5 a month Chegg’s language learning app called Busuu has a similarly convenient app interface but does a MUCH better job teaching grammar in my opinion. I’m learning German and Infinitives were so confusing to try to pick up just using context clues on Duo. I’d tried a couple of the other free options (memrise, lingodeer, the old desktop version of Rosetta Stone) and I think Busuu is the most effective/efficient I’ve tried.
Disclaimer that I was with Duo in the early days when they were still supported by startup money and promising NO ADS EVER. FREE ACCESS FOR ALL, so I am admittedly still a little butt hurt that they moved in the direction they did.
@Dio I hadn’t heard much about it so figured I’d post to the void!
I also like that they have both a vocab and grammar practice section that keeps track of your weak, medium, and strong words and grammar topics.
The main thing I don’t like is that their free version is quite buggy and you have to close out ads for premium every few prompts.