 Major versions of iOS are released annually.The current version, iOS 13, was released to the public on September 19, 2019; it brought user-interface tweaks, a dark mode, a redesigned Reminders app, a swipe keyboard, and an improved Photos app.iOS 13 cannot be used by devices with less than 2 GB of RAM, including the iPhone 5s, iPod Touch (6th generation), and the iPhone 6 and iPhone 6 Plus, which as of June 2019 made up more than 10% of iOS devices.