To anyone looking for alternatives, you can use Cloze Decks for Anki for German, French, Italian and Spanish. You can also build your own decks how those were created) and even generate voice lines using Tatoeba data and Amazon Polly.

I'm surprised that they have implemented hard paywall but haven't made an effort to adjust the pricing and make the app more affordable. No way I will ever pay 70$ for an app, regardless of how good it can be, especially when there are alternatives. 20-30$ would be reasonable affordable price for one time purchase, but it seems there is a trend among learning apps to milk as much money as possible from those who willing to pay.