[jabits]

Idk, I started out using both Memrise and Duolingo in August 2018 for French, used both for a couple of years but now use Duolingo only for French and Italian the last couple of years. I think both are good but prefer Duolingo. But to get conversational I believe you would have to go to more personal methods…

[adastra22]

There’s no app that can build up conversational fluency. You can’t master a thing without actually doing the thing.

SRS apps can be good for building up a vocabulary base. Self-study drill based programs like the old FSI series can be great for internalizing grammar rules so that you don’t have to consciously think about it.

That does give you a great foundation for developing linguistic fluency though, should you relocate to the country or start immersing yourself in native media.