An MIT student, some leftover O’s and a train car of dried apple.

Apple Jacks began as a summer experiment. In a 2017 article for Extra Crispy, the food site then published by Time Inc., the writer Stephanie Burt told the story of William Thilly, then a student at the Massachusetts Institute of Technology. According to that account, in the late spring of 1965 Thilly saw a sign-up sheet on campus from Kellogg’s, which was looking for a summer research assistant, and was the only student to put his name down. He was taken on at the company’s headquarters in Battle Creek, Michigan.

Extra Crispy says Thilly had grown up on a family apple farm and, once given his own project, paired up with an older researcher whose name he could no longer remember. The two started with leftover O-shaped pieces from a discontinued Kellogg’s cereal. Their first attempt, using dried applesauce, failed: Thilly said the cereal stuck together and sank to the bottom of the bowl. When the pair heard of a dried apple product sold in California, their boss had a whole train car of it shipped to Battle Creek so they could experiment at night. They worked out how to apply the dried apple to the O’s, added cinnamon, and, in the article’s words, an ancestor of Apple Jacks was born.

Thilly’s internship ended before the product was tested and launched. The article says he went back to college and later saw an advertisement for the new cereal in the Boston Globe. He went on to teach at MIT, where, Extra Crispy says, he had told the story to his classes for years. English Wikipedia says the cereal was introduced in the United States as “Apple O’s” in 1965, and that advertisers put the name “Apple Jacks” into use in 1971.

Kellogg, WK Kellogg Co, Ferrero, Kellanova, Mars.

For nearly six decades Apple Jacks was a product of the Kellogg Company of Battle Creek. That changed on 2 October 2023, when Kellogg split in two. English Wikipedia, citing CNBC’s report of the same day, says the North American cereal business was spun off as WK Kellogg Co, named after the company’s co-founder Will Keith Kellogg, and listed on the New York Stock Exchange, while the remaining company renamed itself Kellanova and kept the snack brands and the international cereal business.

Both companies have since been sold. WK Kellogg Co agreed in July 2025 to be bought by the Italian confectioner Ferrero. The Italian agency EFA News reported on 29 September 2025 that Ferrero had announced the completion of the deal on its global website, that WK Kellogg Co shareholders had approved it on 19 September 2025, and that WK Kellogg Co had ceased trading on the New York Stock Exchange. Ferrero has owned WK Kellogg Co since then; English Wikipedia, citing the Battle Creek Enquirer, says that in February 2026 Ferrero named Jean-Baptiste Santoul chief operating officer of WK Kellogg, which remains based in Battle Creek.

Kellanova went to Mars. In a press release dated 11 December 2025, Mars announced the completion of its acquisition of Kellanova, whose portfolio it listed as including Pringles, Cheez-It, Pop-Tarts, Rice Krispies Treats, RXBAR and “Kellogg’s international cereal brands.”

The result is a brand with two owners. English Wikipedia describes Apple Jacks as produced by both successors to the original Kellogg’s: WK Kellogg Co in the United States, Canada and the Caribbean, and Kellanova in the rest of the world. The same article says Apple Jacks was brought to Canada in a limited-edition box in 2001 and was later released in Australia.

Design and documentation.

The brands in this group are all breakfast cereals that sit inside much larger food companies. A cereal of this kind usually carries two names at once: the master brand of the company that makes it, and the name of the cereal itself, often with a character, a slogan or a box colour of its own. On a single shelf, the two can work together or pull in different directions.

Ownership adds another layer. A food group can split, sell or merge, and the same cereal name can end up with different owners in different parts of the world, so the company behind a box in one country is not always the company behind it in another. A cereal can also outlast several parents while keeping its name, its pieces and its advertising lines.

Each guide separates what independent sources record from what the company says about itself — when the cereal appeared, who has owned it and where, how its advertising and characters developed — and marks plainly what rests only on the company’s own word.

Kids, a jingle and a cinnamon stick.

The cereal’s look has always been carried by its shapes and its characters. English Wikipedia says the pieces were originally only orange O’s, and that green O’s were added in 1998; it adds that, in a promotion in December 2003, the green pieces briefly became X’s. Those two colours, orange and green, are the ones this guide borrows.

Advertising has done the rest. English Wikipedia describes “The Apple Jacks Kids,” an animated boy and girl, as the mascots from around 1971 until 1992, and quotes the jingle “A is for apple, J is for Jacks, cinnamon-toasty Apple Jacks!” It says that from 1992 a new campaign showed real children defending their taste in cereal under the slogan “We eat what we like.”

In the 2000s the brand turned to two cartoon characters: a laid-back cinnamon stick called CinnaMon and an apple. ABC News reported in July 2005 that the Center for Science in the Public Interest and the Produce for Better Health Foundation had criticised the campaign’s portrayal of the apple as the “bad” character; Kellogg said in a statement that the campaign was meant to be lighthearted and was not intended to disparage apples. English Wikipedia says the apple was later recast as CinnaMon’s competitive friend, and that in a 2007 campaign the two were shown fused together, an idea the brand turned into a cereal piece called Apple Jacks Crashers. The same article says CinnaMon became the sole mascot of a spin-off, Cinnamon Jacks, in 2013.

For a design guide, Apple Jacks shows how two colours and a pair of characters can carry a box for decades, through changes of owner on either side of the Atlantic. Compare its stablemates Froot Loops and Frosted Flakes, both also part of the WK Kellogg Co line-up in North America. For this guide we use O orange, green O and cinnamon cream with a rounded display sans, an unofficial interpretation; no product or logo is reproduced.

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