If you are looking to learn a language. I recommend giving rocket languages a try.

Pros:

Audio focused

forces you to listen to every new term/phrase

forces you to speak new terms/phrases and lets you hear back your voice back to compare

Also grades your speech on chrome automatically

lets you rate yourself and then you go back and review what you thought was okay or hard

I got it for ~$180 and get permanent access for about 230 hours of content

Cons:

No clear function for long term spaced repetition

Not enough spontaneity like writings essays or responding words organized in a new way(that's not already pre-planned)

You only cover everything in the ~20 minute audio lesson

No visual references if you care about that

You might lose your voice

Not gamified but I'm having fun

I think you need to use Anki, but its does everything better than duolingo or memrise when it comes to listening and speaking. While also providing a clear path compared to just venturing on yourself. Duolingo is better for grammar and conjugations, but you are at a much faster pace, its less repetitive, and you just can't tune out. It's not good for children or trying to get some else to learn. Ie. you need to participate and have a desire to learn.