I have developed Admin Application (a mobile-based application) that is linked with firebase. So, you don’t need to buy any hosting and also don’t need to learn PHP or any other extra skills.
Demo: https://codecanyon.net/item/pdf-ebook-reader-app-admin-app/29416990
We’ve moved on to our smartphones and tablets to read while we’re on the go. Bookkart is an android eBook application that takes your reading experience to the next level. You can read online as well as offline.
Buy Knowza Android App and get the professional experience of the high-quality features of it.
Demo: https://codecanyon.net/item/knowza-pdf-reader-pdf-viewer-image-to-pdf-android-11-supported/35089415