Laptop? Check. Printer? Check. Fax machine? Check. Scanner? Nope. If the home inventory report lacks even one of these key ingredients, then putting a signature to a document might be more time consuming than it has to be. But, add to the list a device running Android or iOS, and a free app will do the rest. DocuSign Ink allows any document to be signed from the screen of an iPhone, iPad or Android device, a multistep process that could otherwise require a half-hour or more.