I decided begin the studied to analyse three possible competitors on the market: Memrise, Duolinguo and Mondly:
The application has some very interesting contents, starting from the possibility to interact with videos of real people. Thus users can hear the real accent of the language, with cadences and accents.
The organisation of the lessons and the interface is a bit confusing and unfriendly. Buttons take up most of the available space and the color palette is unattractive.
The application has several points in its favour. The interface is very simple and intuitive, even for those unfamiliar with smartphones. It is easy to navigate and the graphics make the user experience very pleasant. You get the feeling that it is very easy to learn a language, even if it is not. The problem with this application is that often the exercises are very repetitive and there are no bonuses that tempt users to do more.
I think the application is the most complete of the three. The choice of exercises is very good and wide, the starting levels are many. The graphics are very well cared for and users really have the feeling of improving, the graphs help to have this perception.
For inexperienced users, this could be a drawback because they could lose out on the large amount of exercises available. The feeling is that you have to spend a lot of time learning the language and not all users have this time available.