My musical ears aren't the type that can tune a guitar without any tools/tuners. Sure there are plenty of guitar tuning tools and even apps for your smartphone. If you want to speed up the process check out this Kickstarter tool, the Roadie Tuner. The Roadie Tuner ($79) pairs a handheld tuner that pairs with a smartphone app for semi-automated guitar tuning. Video of the Roadie Tuner after the break.