Here is a fact about children that is both completely obvious and, apparently, worth a great deal of money: a kid who will not, under any circumstances, brush their teeth for you will happily brush their teeth for a cartoon animal that lives inside a phone. This is not a loophole in child psychology so much as it is child psychology. Joon Health, a San Francisco company that went through Y Combinator's Winter 2022 batch, has built an entire business on the difference between those two sentences.
The product works like this. A child opens the Joon app and adopts a virtual pet called a Doter. The Doter needs to be fed, washed, and generally kept alive and cheerful. The catch - and it is the whole company, really - is that the child cannot do any of the caretaking, or play the game around it, until they have first completed real-world tasks that a parent (or, increasingly, a clinician) has assigned. Homework. Making the bed. Taking medication. Getting off the couch. Each finished task unlocks progress for the Doter. The pet levels up because the kid did.
If you have ever tried to get a distractible eight-year-old to do a sequence of boring things in a specific order, you understand that this is not a small trick. It is closer to alchemy. Joon's founders would tell you it is not alchemy at all; it is just game design pointed at the right target.
The founders who never stopped playing
Joon was founded in 2021 by three people who met at UC Berkeley: Isaac Eaves, Brad Brenner, and Kevin Bunarjo. The origin story is the kind that sounds too neat to be real but appears to actually be real. Eaves, the CEO, has ADHD. He also, by his own accounting, spent something north of 10,000 hours playing video games as a kid. Most founders would file that away as a slightly embarrassing biographical detail. Eaves built a health company on it.
The logic is worth sitting with, because it is the reason Joon exists rather than yet another chore-chart app. Games are extraordinarily good at getting people - especially kids, especially kids with ADHD - to do repetitive tasks with focus and even joy. The medical and educational systems have spent decades trying to get those same kids to do repetitive tasks with focus and mostly generating worksheets and worry. Eaves' insight was not that games are fun. Everybody knows games are fun. It was that the fun could be pointed somewhere useful instead of being treated as the enemy.
Bunarjo, the engineer, grew up in Jakarta on Minecraft, Runescape, Pokemon, and Tetris. Brenner, the COO, started his first business at age seven and had launched four companies before Joon, which is either a red flag or exactly the kind of person you want running operations, depending on your mood. All three studied at Berkeley; two of them hold dual degrees in computer science and business administration. It is a small, product-obsessed team - somewhere between ten and thirteen people - which is to say the whole company could fit around a large dinner table.
“Kids choose a virtual pet called a Doter to feed, wash and grow - but first they have to complete the tasks their parents assign.”
Two screens, two entirely different products
The most elegant thing about Joon is that it is really two products wearing one app. The child sees a game: a creature to raise, a world to progress through, rewards to unlock. The parent sees a dashboard: a place to assign quests, set routines, attach rewards, and watch, over weeks, whether a kid is actually building the habit or just gaming the game. Same screen, two people, two completely different jobs getting done. That is a hard thing to design and an easy thing to underrate.
It matters because the failure mode of most gamified habit apps is that the reward becomes the point. Kids chase the badge, ignore the behavior, and the whole thing collapses into a slot machine. Joon's design leans on emotional stakes rather than points. You are not doing chores for a number to go up. You are doing them because something you have adopted and named and grown fond of needs you to. It is a subtle distinction and it is more or less the entire moat.
The app is available on iOS, Android, Amazon Fire tablets, and Chromebooks - a deliberately wide net, because the households that need this most are not all buying the newest iPhone. It carries a 4.7-star rating across more than 6,600 App Store reviews, which for a product whose core users are children with behavior disorders and whose paying customers are their exhausted parents is a genuinely notable number.
The business, in numbers
Joon makes money the direct-to-consumer way: parents pay a recurring subscription for the full experience and the parental controls, with some in-app purchases layered on top. By mid-2023 the company reported crossing 500,000 users and roughly 18,000 paying subscribers. That conversion gap - half a million people using it, eighteen thousand paying - is not a weakness so much as it is the shape of every consumer subscription business, and the paying cohort is the one that tells you whether the thing works. Eighteen thousand families do not keep paying month after month for a chore app that does not deliver.
In October 2023, Joon raised a $6.4 million seed round led by MaC Venture Capital and Dune Ventures, with Blue Lion Global and North South Ventures participating. That is on top of the Y Combinator backing from the W22 batch and early support from Founders, Inc. The money is aimed squarely at a big, patient ambition: the team has said it plans to become the first-line vertically integrated digital treatment for pediatric behavior disorders over the next ten years, serving the 100-million-plus families in the United States.