Nitro vs PDF-XChange

Nitro Pro Takes Documents to New Heights. Securely sign, approve, collaborate, and manipulate your documents online and on your desktop. Create, prepare and sign—anytime, anywhere.
Those wishing to View/Modify or perform simple editing and even OCR Image based PDF files on their Windows PC's now have a FREE pdf reader alternative to the Adobe Reader! The PDF-XChange Viewer is smaller, faster and more feature rich than any other FREE PDF Reader/ PDF Viewer/ PDF Editor available.
Nitro vs PDF-XChange in our news:

2015 - Adobe's competitor Nitro acquired document marketing service DoxIQ to challenge Nuance

Nitro, the document management company, that calls its Nitro PDF reader the "No. 1 replacement for Adobe Acrobat" has acquired a document analytics company DoxIQ. DoxIQ provides individuals insight into document workflows such as, who has viewed specific parts of a document, how often parts of a document have been viewed, and to set auto-notifications on certain changes in the document. This simplifies and accelerates the document collaboration, approval, and signing for individuals. Nitro will transition DoxIQ customers to its document sharing and e-signature product, NitroCloud.  Nitro capabilities will allow users to modify content, mark content that includes sensitive material, approve language in the document and search and organize documents based on the content.