Answer 1

If you're an Android user, in Play Store you will be able to download SoloLearn: https://play.google.com/store/apps/developer?id=SoloLearn

If you're an iOS(Apple) user, in AppStore you will be able to download the app: https://itunes.apple.com/us/artist/sololearn-inc/id933957049

If you're an Windows Phone user, in Windows Phone Store you will be able to download the app: https://www.microsoft.com/en-us/store/search/apps?q=sololearn+inc

If you want to use SoloLearn in the PC you only need to type and search in Google: sololearn.com and you will be redirected to the official web.