You have cited that the app is optmized for tablettes and you have used an icone of "Tablette + smartphone". However I couldn't use your plateform in my Samsung galaxy S8; and that was very dispointing because I use my phone to read a lot.
so I will stick with the EPUB version for the moment. However could you please optimize your app for smartphones or remove the mobile icon from the ads.
Customer support service by UserEcho