By Clifford Colby 

With Android 10, Google lets you apply a systemwide dark theme across its new mobile OS, and you can easily turn it on in individual Google apps as well, from Calculator and Calendar to YouTube, on your phone. But Google doesn't let you apply it everywhere, and a few popular apps -- including Chrome -- lack a dark-mode setting.

 

By Jackie Dove 

Mobile apps are a universal gateway to all kinds of multi-purpose functionality. With iOS apps, permissions allow you to seamlessly tag photos and videos with your location, permit video apps to use your camera and microphone, allow map apps to determine your exact location to give you proper directions, and let weather apps give you the correct forecast so you know whether to dress warmly or pack an umbrella.