John Gruber, writing for Daring Fireball:
Craig Federighi, senior vice president of software engineering at Apple, when asked if he force quit apps and if force quitting helped battery life, as quoted by MacRumors:
Yours truly, way back in 2011, on iMore:
And in 2012, on why Apple Genius' sometimes recommending force quitting apps, also on iMore,
Personally, I almost never kill all the apps on my iPhone and iPad. I say "almost" because there are times when I'm running benchmarks or testing a beta or doing something else abnormal that I'll really need to it. Otherwise, I let iOS be iOS and manage its own resources and task running.
And, unless you're a software reviewer, developer, quality assurer, or someone else who really needs to be abnormal, so should you.
I do, however, force quit Facebook, Snapchat, and Pokémon Go far more often than I should need to. As far as I'm concerned, any app that goes out of its way to stay alive in the background, while draining my battery so fast it's almost visible in the indicator, has it coming.
So, my advice has always been and remains this:
The fast app switcher allows you to force quit apps for a reason. It also doesn't let you force quit all apps for a reason. If and when something goes wrong, use it with caution. Do it when you need to. Never do it just because you want to.
Because then you'll be the cause of bad behavior and excess battery drain.
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Rene Ritchie is one of the most respected Apple analysts in the business, reaching a combined audience of over 40 million readers a month. His YouTube channel, Vector, has over 90 thousand subscribers and 14 million views and his podcasts, including Debug, have been downloaded over 20 million times. He also regularly co-hosts MacBreak Weekly for the TWiT network and co-hosted CES Live! and Talk Mobile. Based in Montreal, Rene is a former director of product marketing, web developer, and graphic designer. He's authored several books and appeared on numerous television and radio segments to discuss Apple and the technology industry. When not working, he likes to cook, grapple, and spend time with his friends and family.