Free Cloud Storage : Dropbox vs GoogleDrive vs SkyDrive vs SugarSync

Google Drive:

      

      Google Drive comes with 5 GB of free storage . It also include an option to turn on OCR(Optical Character Recognition ) text scanning , which helps you to scan the images for text and make them searchable when you upload a image. In Google Drive you can add files by "Drag-and-Drop" method. Google Drive has a built-in editor feature . Google Drive is available for Windows, Mac, Android and iOS is still on progress. In Google Drive you can open up to 30 file right inside your browser.
GoogleDrive for PC

GoogleDrive for Mobile - Android only

Dropbox:

     Dropbox comes with 2 GB of free storage on sign-up and you get 500MB of free storage for every referrals up to 16GB. So you can extend up to 16 GB of free storage for free account. The strength of the app is it's API built on . The dropbox is the one of the most developer- friendly storage since it helps you to access your files everywhere. The files are secured with SSL AES 256- bit encryption. Dropbox offer 50 GB and 100GB of storage for $9.99 and $19.99 which is expensive when compared with other could storage's. You can add file by Drag-and-Drop method. Dropbox is available for iphone ,ipad, Android ,Backberry , Windows , Mac , Linux.
Dropbox for pc
Dropbox for Mobile

SkyDrive:

     SkyDrive comes with 7GB of free storage (Free upgrade of 25GB , if claimed on time). SkyDrive are very good at synchronizing when the documents are created using Microsoft Excel,Word , PowerPoint and OneNote. In SkyDrive you can share public links , view or edit public links. SkyDrive has a special feature known as "Skydrive's Fetch" in which if you forgot to synchronize something and if you home computer is turned-on , you can still access the files.SkyDrive is available for Windows ,Mac ,ipad ,iphone ,Windows Phone.
SkyDrive for Pc- you need to sign-in to get the app.
SkyDrive for Mobile

SugarSync:

     SugarSync comes with 5GB of free storage on sign-up and you get 500Mb of free storage for every referrals up to 32GB , So you can extend up to 32 GB on free storage for free account . SugarSync let you to pick folders all over the computer to synchronize, then let you to choose whether you want to synchronize  each folder to all the devices or to a particular device.You can password protect the file when you are sharing them . It is secured with SSL AES 128- bit encryption.SugarSync is available for Windows , Mac ,iphone,ipad,Android ,Windows Phone,Symbian ,Blackberry.
SugarSync for Windows
SugarSync for Mac
SugarSync for Mobile

Click the below link to view the comparison table:

Dropbox vs GoogleDrive vs SkyDrive vs SugarSync