Yorocobu — apps for underserved markets

Yorocobu LLC is an app development company. Its mission is stated plainly: find holes in niche markets, and build apps to fill them.

The company was filed in Wyoming in 2025. Operations are based in Chapel Hill, North Carolina, and the work is done remotely.

The work spans web and mobile, built on React, Swift, and Flutter. Five projects are in development. Yorocobu also takes on client work.

Yorocobu means "to have joy" in Japanese. Helping people find happiness drives everything the company does. That is why it works day and night to make apps that improve quality of life.

The name comes from 喜ぶ, to be glad. The company mark is the kanji 喜, which carries that same sense of gladness, and it sits at the end of the wordmark.

The standard romanization of 喜ぶ is yorokobu, with a k. The company name is spelled yorocobu, with a c.

Yorocobu LLC was founded by two people, who share the title Co-Founder. Both are Morehead-Cain Scholars at the University of North Carolina at Chapel Hill.

What follows is everything the site publishes about them. Anything further is best asked directly.

Yorocobu builds with industry-leading technologies to deliver apps across all platforms.

Primary technologies. React for modern web applications. React Native for cross-platform mobile apps. Swift for native iOS development, and SwiftUI for modern iOS interfaces. Flutter for beautiful native apps.

Also building with. JavaScript, TypeScript, Python, Node.js, Firebase, PostgreSQL, AWS, Git and GitHub, Figma, Docker, REST APIs, and GraphQL.

Five projects are in development across multiple sectors:

• Email Platform — in development
• Family History App — in development
• Mobile Tool — in development
• Scheduling Program for Institutions — in development
• Marketplace Tool — in development

Product names, descriptions, and release dates are not public yet. Anyone who wants to hear more as these move toward release is welcome to get in touch.

Yorocobu takes on client work alongside its own projects.

What a project would cost, how long it would take, and whether Yorocobu has room for it right now are all conversations rather than published figures. To start one, describe what you have in mind — Joy can pass it along from here, or you can email ethan@yorocobu.org directly.

There are two ways to reach Yorocobu, and they end up in the same place.

Joy can take the message. Ask her to send something and she will collect it here — a few short questions, a draft you can edit, and nothing leaves until you press send. Leave a reply address and it goes with the message so Ethan can answer you directly; leave it out and the message still arrives, as a note rather than a conversation.

Or write directly. The address is ethan@yorocobu.org, which reaches Ethan. Either route gets to the same place, so use whichever suits you.

Either route is the right one whether you are a prospective client with a project, an investor, or a partner exploring something together.

Yorocobu is also on LinkedIn and Instagram.

Joy is the guide for this site. Ask her anything Yorocobu has published and she will point you to it.

The name is the English of 喜ぶ, to be glad — so the guide and the company are the same word in two languages, and 喜 is the mark the site opens on.

She can do two things. The first is answer from a small set of published entries about Yorocobu and nothing else, which is why she will tell you plainly when something is not in them rather than guessing. The second is take a message: ask her to send a question to Ethan and she will collect it right here, draft it for you to edit, and send it only when you say so. A reply address is optional — with one, Ethan can answer you directly; without one, the question still reaches him.

What she cannot do is answer for Ethan, promise a reply, or tell you what happened to a message after it was sent. She is not a person, and she will say so if you ask.