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Apple Jacks is a brand of cereal produced by Kellogg's and targeted mainly at children. It was introduced to the U.S. as "Apple O's" in 1965 after being invented by William Thilly, a member of Delta Upsilon Technology Chapter and now a professor at MIT. In 1971 the name "Apple Jacks" was put into action by advertisers. The product is described by Kellogg's as a "crunchy, sweetened multi-grain cereal with apple and cinnamon."
Originally, all Apple Jacks cereal pieces were orange and O-shaped, although they have become brighter and more orange colored over the decades. In 1998, O-shaped green pieces were introduced. On December 8, 2003, as part of a marketing promotion, the orange jacks remained Os but the green jacks were Xs for a while (actually, 'jack' shaped, from jumping jacks, the campaign was made as adults made the cereal make 'more sense', as with the flavor), and in summer 2005 the green jacks were figure-8s (double Os) for a period of time.
More recently, Apple Jacks has introduced New Apple Jacks 'Crashers' – a unique cereal piece that replicates a mid-2007 advertising execution when mascots Bad Apple and CinnaMon were accidentally fused together. The latest (limited) edition, in 2010, are Apple Clones, with red pieces shaped like apples. In 2012, Apple Jacks was brought to Canada in a Limited Edition box.
The first Apple Jacks mascot in the 1960s was "Apple Guy", a figure made from cutting a face onto an apple and applying a hat and pieces of cereal for eyes.
In the late 1960s the box depicted an "Apple Car" with pieces of cereal for wheels.
Around 1971, the official mascots became "The Apple Jacks Kids", a simplistically drawn animated boy and girl duo. The commercials featured the children singing and tumbling around. Their reign lasted almost twenty years, making them the most well-known Apple Jacks mascots and most universally associated with the cereal in the public's memory. During this time, the Apple Jacks jingle became an integral part of the ad campaign: "A is for apple, J is for Jacks, Cinnamon-toasty Apple Jacks!" This campaign was retired in the late 1980s.
A television ad campaign in the 1990s featured children expressing their enjoyment of Apple Jacks, regardless of its lack of apple flavor. The slogan for this campaign became "We eat what we like". The shift toward marketing cereals directly at children signaled the growing recognition of children's influence on family purchases. The commercials took place in such normal kid hang-outs as the at school, garage, ballet class, the kitchen and such. After each commercial, the group of children would pose for a group Polaroid of the entire group.
As of 2004, the marketing mascots are a care-free Jamaican cinnamon stick named CinnaMon and an accident-prone apple named Bad Apple. Labeled as Apple Jacks Adventures in print advertising, the commercials focus on CinnaMon upstaging Bad Apple by reaching a bowl of Apple Jacks before he can, in spite of the apple's attempts to stop him. Due to legal troubles, Bad Apple's antagonistic nature was dropped; Apple and CinnaMon were then portrayed as highly competitive friends, both getting into the bowl. The campaign was slated to be retired in 2007, and replaced by a retread of the 1990s campaign focused on children, but fan response to Apple and CinnaMon helped them remain as the mascots. In 2007, Apple and Cinnamon were fused together with Cinnamon sticking through the center of Apple with both of their legs at the bottom of their body. They remained this way for a few of the commercials until they became unstuck by a special machine. In 2009, Apple and Cinnamon were transported out of their cartoon world to the real world of New York City, where they continue to race each other to the bowl where they would enter the bowl at the same time.
- New Kellogg's Apple Jacks, apple good for breakfast or snacks, cinnamon toasty, apple tasty, a bowl a day keeps the bullies away. (1960s-late 1970s)
- Apple Jacks will not be sold to bullies (often printed adjacent to a red-haired boy with glasses) (1960s-late 1970s)
- A is for apple, J is for Jacks. Cinnamon toasty Apple Jacks! (1980–1992)
- We eat what we like. (1992–2004)
- Apple Jacks. Where the sweet taste of CinnaMon 'Is the winna-mon'. (2004–2007)
- Apple Jacks. Where the sweet taste of Cinnamon, and Apples, is the winna-mon' (2007–2008)
- Apple Jacks. Apple or CinnaMon? Who will be the winna-mon? (2008–2009)
- Apple Jacks. The great taste of apples and cinnamon make the great taste that's always the winna-mon. (2009–present)
According to the label on the box, in 2010, each 28 gram serving had 100 calories, three grams of dietary fiber, and 12 grams of sugar. The front of the box indicated that the inclusion of fiber was a change from previous versions of the cereal.
Cinnamon Jacks 
In 2013, Kellogg's Apple Jacks introduced a new multi-grain cereal called "Cinnamon Jacks". CinnaMon became a mascot of his very own cereal. Cinnamon Jacks is a spin-off of Apple Jacks.