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I would say you can pretty much aim for iOS 10 or even 11 as a minimum. The number of devices running iOS 7 is quite small. My moms iPad 2 runs iOS 9 and that’s

• robocat 7y ago
  You can do that if you don't have any poor users, or you don't have to care about them (e.g. many consumer apps). Our clients are businesses, and our users are their employees (from a wide range of backgrounds). The employees must use our web app, and our clients mostly don't get to choose what their employees use. We log how many users are on old browsers, and we try to support users on old browsers if it isn't too costly for us to do so. In my experience, the majority of people using a iPhone 4 or an Android 4.4 device are doing so because they can't afford to update, and they are often otherwise marginalised. I try hard not to give them yet another kick in the teeth for stuff outside their control.