Dream PG

In DoubtsCafe, any student can register and post a question, and assign a category for the question.

Similarly, any faculty can register as an expert in any domain, and can answer questions in that domain.

Typically, a user can get answers from multiple experts in that domain, and there can be follow-up clarifications to the answers.

https://play.google.com/store/apps/details?id=com.doubtscafe.app

https://play.google.com/store/apps/details?id=com.dreampg.app&hl=en_IN&gl=US