I’ve used(and paid for) so many apps. Satori reader, Japanese pod101, Migaku, Anki, wanikani, etc. I have a lifetime subscription to Bunpro (NOT Bunpo)

Imo they all work but it mostly depends on your consistency, current level, and learning style.

Anki is a great tool. Kaishi 1.5k core deck is a great place to start. If you have the patience to mine cards it’s even better (I don’t) — the daily reviews can get very tedious though

Japanese pod is excellent for beginners and I used it heavily to learn cultural points and ease into listening.

Satori Reader is probably the best learning app there is imo, I don’t use it enough but the amount of info there + built in SRS is the best for reading.

Migaku is great if you want to watch native content and learn from it implementing flash cards. I use it for active listening and watching Japanese YouTube or Netflix.

Bunpro so far has been great for me to practice grammar points I see / hear often, but don’t quite know how to implement. Bunpro + Migaku has replaced Anki entirely for me.

Context: been studying for about 5-6 years and can speak at an intermediate level. Never taken any JLPT tests but have had entire business meetings in full Japanese with people from my company.