If you're wondering why some of your gaming apps are turning red - it's because it's World Aids Day, external.
Apple says it's supporting the RED charity, founded by U2 singer Bono, through a number of initiatives.
As well as apps changing colour, the US tech firm is expanding its range of RED products, including phone cases.
It's also donating $1 (80p) for each transaction made using Apple Pay in its physical and online stores, up to a total of $1m (£798,632).
Bank of America says it'll contribute up to that sum for Apple Pay transactions using its cards.
Donations will be made until 6 December.
Twenty games for iOS in the App Store are offering exclusive content and will donate proceeds from in-app purchases to the Global Fund, external.
The games include Angry Birds 2, Candy Crush Jelly Saga, Clash of Clans, SimCity BuildIt and War Dragons.
Products turning red include a pair of headphones, a tablet case, a portable speaker plus two phone cases.
Around 400 Apple stores are switching their logos from white to red.
Meanwhile, The Killers are giving all the proceeds from their festive album, Don't Waste Your Wishes, to the Global fund as well as their new single I'll Be Home For Christmas.
If you live in America, you can download a film about Aids/HIV called the Lazarus Effect for free.
The RED charity raises money for life-saving medication in sub-Saharan Africa, which has the highest prevalence of Aids/HIV on the planet.
The cash funds programmes which offer counselling, testing, prevention and ARV medication that prevents the transmission of HIV from mothers to their unborn babies.
"The gift of life is the most important gift that anyone can give," said Apple's CEO Tim Cook.
"Thanks to the vision and dedication of (RED), an Aids-free generation is within our reach.
"We want to leave the world better than we found it, and that's why our long-time partnership with (RED) remains so important to us."
World Aids Day was first held on 1 December 1988 and was the first ever global health day.
What is HIV/Aids?
HIV stands for the Human Immunodeficiency Virus - a microscopic bug that infects humans and attacks the immune system and is passed on in blood, vaginal secretions and semen.
HIV infection can lead to Aids, which is the final stage of the virus.
There's more information about Aids/HIV at BBC Advice.
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