What are some alternatives?
When comparing FileApp and iFiles, you can also consider the following products
Documents by Readdle - A central hub for all your files.
Files - Keep everything organized without breaking your flow. Dropbox brings your files together, in one central place. They're easy to find and safely synced across all your devices—so you can access them anytime, anywhere.
iFile - If you need a new file manager for your device, iFile might be the answer you seek.
Files by Microsoft Corporation - Files is a free app for managing files on your Windows Phone. By using this app you can:
GoodReader - With GoodReader on your iPhone, iPod Touch or iPad, you can read virtually anything, anywhere.
Amaze File Manager - Free and open-source Android file manager with no ads.