Memrise’s algorithm was very efficient for me originally but some of the recent changes make me feel off. The app has been a no-go for me because of it’s differences. I’ve been asking mods for their input on new changes but no feedback yet.
I’ve also looked into Anki and from what I see you can tweak their algorithm to your needs which makes it interesting to me once one makes the switch and gets decks set up. The biggest benefit for memrise was its user-created courses and a user-friendly learning environment, also which has gone through some changes. Currently doing some looking into Anki but haven’t tried out Lingvist yet.
I find Memrise to be the least believable. Their one-size-fits-all algorithm ends up fitting no one and no item. You want an algorithm that varies the review interval according to the difficulty of the item and your preferences, so Anki is the obvious choice.