Adobe Acrobat DC is described as 'Create and edit PDFs. Collaborate with ease. E-sign documents and collect signatures. Get everything done in one app, wherever you work. Acrobat’s got it. Stay on top of your documents with powerful features for desktop, mobile, and web' and is a very popular PDF Reader in the office & productivity category. There are more than 100 alternatives to Adobe Acrobat DC for a variety of platforms, including Windows, Web-based, Mac, Linux and iPhone apps. The best Adobe Acrobat DC alternative is PDF-XChange Editor, which is free. Other great apps like Adobe Acrobat DC are PDF24 Creator, Nitro PDF , Master PDF Editor and PDFgear.
This service is an alternative to DocuSign, it is not a PDF editor.