As an English learner, I would like to say Liulishuo App, an English learning mobile app developed by LAIX, could meet most of my learning needs in two ways:

1. It provides advanced auto-scoring engine of spoken English to help correct pronunciation and accent. 

1a. It is professional but cheap, so it enables a lot of students, who are usually are on tight budgets, to reach good learning resourses even without stepping out of their home. 

1b. It enhances our learning efficiency. In traditional classroom, usually of 30-40 students, it is hard for teachers to take care of everyone's learning progress. But with learning mobile app, it could offer help whenever you asks.

2. It provides various hand-picked videos of scenarios such as business, work place, daily life.

2a. Graphics and animation could capture my attention while printed books make me feel bored, so with this app, I barely lose interests.

2b. Videos of different scenarios also help me to relate to certain situation, therefore I could know better in which I could use what I have learned. The learning is based on real life, not just for coping with tests.

You could refer to the link below and some screenshots are available:

https://apps.apple.com/us/app/%E8%8B%B1%E8%AF%AD%E6%B5%81%E5%88%A9%E8%AF%B4-%E8%AE%A9%E4%BD%A0%E5%BF%8D%E4%B8%8D%E4%BD%8F%E5%BC%80%E5%8F%A3%E8%AF%B4%E8%8B%B1%E8%AF%AD/id597364850