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Try Duolingo, it's fun ( Like a game) and you learn at the same time .
Of course, it is much easier to find a decent tutor in a foreign language for yourself than constantly trying to use exercises in strange applications like duolingo. I recommend that you look for a tutor on the site where I found information about https://preply.com/en/blog/2019/02/15/how-to-learn-german/. I advise you to read this.
I used only the services of tutors. Therefore, I do not know mobile applications.
Some Mobile Apps that are helpful in learning foreign languages are :
1- Duolingo
2- Google Translate
3- Fluenze
4- Babbel
5- Rosetta Stone
6- Bedidas