By Todd Bernhard
Siri was great when it first came out, but competing vendors have caught up and arguable exceeded the capabilities of Siri. Microsoft's Cortana is quite advanced, and thanks to its integration with computers, today's Windows 10 PCs have a Cortana button built-in, so it's not just for mobile devices. Amazon offers its Echo products and the Alexa assistant, and Google offers OK Google and Google Home. Finally, with today's Worldwide Developers Conference, Apple is enhancing Siri and bringing it to the Mac as part of macOS Sierra.