Many people have multiple cloud storage accounts either on different services or on the same one, but managing them can be a true nightmare. Remembering which file is stored on which account, quickly finding a document or even remembering all the passwords that your accounts have is not that easy, but, if you use a specialized service, things become a lot simpler. Here you will find some of the best apps for your Android smartphone that will help you conveniently manage all of your cloud storage accounts from a single, unified interface.
To be totally honest, this application is actually called "Cloud File Manager & Explorer", but the title is so long and dull that everyone refers to it simply as PrimaDesk (which is the name of the Developer). The good news is that the name is the only boring thing about this tool. The app can work with some of the most popular cloud storage services such as Dropbox, Google Drive, OneDrive, Box, SugarSync, etc. while also offering support for files stored on other services such as Gmail, Facebook, etc. With PrimaDesk you'll be able to view all the files stored on all your accounts, perform cross-searches on multiple storage services at once, easily share your files with others, and you can even edit photos or documents. Additionally, the app will allow you to stream music and videos from any of your cloud storage accounts.
As far as I could tell, the application doesn't offer support for iCloud accounts, and that could be a big disadvantage, but since we're talking about Android apps, I'm guessing not too many of you use Apple's cloud storage service.
One of the new kids on the block, Unclouded is a cloud storage management solution highly acclaimed by the Internet media. This application offers you details about each of your storage accounts, helping you figure out how much space you're using and how much you have left at a single glance. (The used space is also divided into categories: pictures, documents, etc. so that you can quickly figure out what takes up the most space). The app doesn't just allow you to search for files across all your accounts at once, but it also has a feature which helps you identify duplicates which I found to be quite handy. The app works with Google Drive, Dropbox, OneDrive, Box and Mega.
What you may not like about Unclouded is that its free version will only allow you to manage two accounts, and if you need more or want to protect the app with a PIN password, you will need to purchase the premium version.
ZeroPC Cloud is one of the most comprehensive cloud management solutions that you can find. This app works with a wide range of services including Google Drive, Dropbox, OneDrive, Box, Amazon Cloud Drive, Copy.com, SugarSync, Facebook, Flickr, Instagram, PhotoBucket, Picasa, Evernote, Yandex and 4shared. The application allows you to browse through all your accounts at the same time, create a folder called "Collection", where you can keep the files you often access even if they're stored on different clouds, and easily share any file that you want with your friends. Moreover, if you're willing to pay for the premium version of ZeroPC Cloud, you will also gain the ability to manage multiple accounts on the same storage service.
Another comprehensive cloud management solution for Android, Otixo offers support for lots of services such as Google Drive, Dropbox, Box, OneDrive, Facebook, Flick, Evernote, FTP servers, WebDAV, etc. Besides allowing you to browse through all the files stored on all your accounts from a unified location and enabling you to perform universal searches, the app also lets you quickly copy and move files from one cloud service to the other. (When performing cloud-to-cloud data transfer the files are never downloaded to your phone, so your privacy is protected at all times.) What I really like about Otixo is that it also provides offline capabilities allowing you to open (previously marked) files stored on the cloud even if you don't have a working Internet connection.
Last on our list, CloudFuze is a powerful solution for cloud management and synchronization. This tool works with popular services like Google Drive, Dropbox, OneDrive, Box, etc. as well as FTP and WebDAV servers. The application allows you to login to all your accounts using a single a password, navigate all your files from the same interface, perform cross searches across all your cloud accounts and quickly share files with others. Additionally, it offers advanced management features enabling you to edit any of your stored items and being able to automatically organize all the files you store. CloudFuze will help you synchronize the files stored on your cloud accounts with those stored on your current or on multiple devices. And finally, the app will allow you to manage multiple accounts from the same storage service without charging you anything, which is a big plus.
If you're asking for my personal opinion about which cloud management service to choose, I can't actually give you a definitive answer. All the apps on this list are pretty great, and I guess it depends on each person's requirements and tastes (in this case, how well you get along with the GUI is quite important). All these applications are user-friendly and make your life a lot easier so try them out and see which one works best for you.