Kosuke Kato DEFINER
Kosuke Kato
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DEFINER

DEFINING ESSENCE.
Kosuke Kato Portrait

Hello.
I'm Kosuke Kato, a Definer.
I operate under the trade name Kosuke.

Born in 1980, currently living in Hachioji, Tokyo.
Living across bases in Hachioji and Higashi-Totsuka.

I began my career as an independent freelance creator in 2005.
Working closely with a wide variety of inspiring clients, I have dedicated myself to solving core challenges for corporations, individuals, and organizations.

The Japanese name Kosuke (康祐) is said to embody the meaning "Show that you are healthy next to you."
Because of this, I embrace "Show that you are healthy next to you." as the guiding tagline for my life and creative practice.

Whether for listed corporations,
fast-growing startups,
non-profits working on societal transformation,
or vibrant, independent individuals,

Isn't it fundamentally essential to show health and vitality to those beside you?

Show that you are healthy next to you.

Crucible of Works

2005 - 2026 / Projects Archive
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kamos.io
2026
2026 Firebase

kamos.io

Project Kamos is an AI-powered thinking tool initiative led by Definer Kosuke Kato. Encompassing the suite of creative tools known as Kamos Suite, it pursues diverse explorations at the intersection of AI and human cognition.

Hachioji OPA 7th Anniversary Campaign
2025
2025 Illustration

Hachioji OPA 7th Anniversary Campaign

Created key visual illustrations for Hachioji OPA's anniversary campaign.

kamos.io/kosukekato
2025
2025 Web Design

kamos.io/kosukekato

kamos.io/kosukekato is Kosuke Kato's portfolio showcase generated via Kamos Framework Analysis. Beyond introducing generative thinking principles, it showcases live galleries, matrices, and future scenarios, hosted on Firebase.

Kawasemi Kawara Meat Festival
2025
2025 寄居

Kawasemi Kawara Meat Festival

Hosted a pork offal farmers market to revitalize local commerce and celebrate Yorii Town's regional culinary heritage at Kawasemi Square. Handled promotional flyer design.

Seitai Clinic Tsunagari
2025
2025 Studio

Seitai Clinic Tsunagari

Seitai Clinic Tsunagari in Mitaka, Tokyo, helps clients build pain-free bodies for lifelong vitality. Handled website design, development, and photography.

Hachioji OPA 6th Anniversary Campaign
2024
2024 八王子

Hachioji OPA 6th Anniversary Campaign

Created key anniversary illustrations for Hachioji OPA's 6th anniversary campaign.

FLL - Freelance Long-life Lab.
2024
2024 Graphic Design

FLL - Freelance Long-life Lab.

Freelance Long-life Lab. is a mentorship program supporting sustainable, fulfilling, and enduring careers for independent designers and freelancers.

Co-creation Local Project Center rutsubo
2024
2024 Studio

Co-creation Local Project Center rutsubo

Co-creation Local Project Center rutsubo is a social experimentation platform shaping joyful ways of living in Yorii Town. Handled website design and development.

Buildit Inc. UI/UX Design Support
2024
2024 UI/UX Design

Buildit Inc. UI/UX Design Support

Buildit Inc. designs and develops applications and digital services driving DX in adult education. Handled UI/UX design within their engineering team as a collaborative partner.

Kosuke - Show that you are healthy next to you.
2024
2024 Studio

Kosuke - Show that you are healthy next to you.

Kosuke is Kosuke Kato's sole proprietorship practice. The portfolio website was built using STUDIO.

Explore All 100+ Works

Kosuke Kato

Kosuke Kato / Definer
AI Orchestration × Design × Engineering

Engaged in professional web and interface design since student days, Kosuke Kato established his independent freelance career in 2005. Relocated his studio to Hachioji, Tokyo in 2018. Specializing comprehensively in communication design across web, graphics, brand identity, and UI/UX engineering. Interests include rugby, cooking, illustration, and photography.

Detailed Profile
2005 - 2012

Independence & Experience Transporters (ET)

Started independent practice Experience Transporters (ET) in June 2005. Developed proprietary internal operations management system 'ET withwith'. Operated interview publication 'ET Luv.Lab.', and managed public relations for the Club Rugby Metropolitan League and the New Zealand Ambassador's Cup.
2012 - 2018

Incorporation of ET Inc., 100 Clients & Moving to Hachioji

Through incorporation, put into practice a structure to "keep doing what I want, the way I want, continuously." Dissolved the corporation in 2018, relocated his base to Hachioji, and opened sole proprietorship "Kosuke Kato Planning & Design."
2025 - 2026

Becoming a Definer & Launching Project Kamos

Marking 20 years as an independent creator, transitioned his title to "Definer." Leading next-generation thinking and craftsmanship through the AI-era thinking toolkit "Kamos Suite," Prototyping Workshop Kosuke, and publishing the book "Definer: 20 Years of Craft and Observation."

Projects & Suite

All Projects
Project

Project Kamos

Project Kamos is centered on human-LLM collaboration, structuring and visualizing thought through a unique "question design approach" to support fundamental problem-solving and idea generation. Through interactive reports, it ferments deep insights and opens up the freedom and future of AI utilization.

kamos.io
Project

Prototyping Workshop Kosuke

Full of ideas, full of dreams, full belly, everyone happy. That's Prototyping Workshop Kosuke. A project aiming to be like an invention king of the modern era, breathing life into all kinds of ideas at lightning speed.

Explore the Workshop →

Illustrations

2005 - 2026 / Selected Works Archive
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Rugby Embroidered Patch

Rugby Embroidered Patch

2026
Definer Font

Definer Font

2026
Definer All

Definer All

2026
Definer Girl 2

Definer Girl 2

2026
Definer Girl

Definer Girl

2026
Definer

Definer

2026
8th Anniversary @ Hachioji 2

8th Anniversary @ Hachioji 2

2026
AI Illustration Matrix

AI Illustration Matrix

2026
Sugadaira 2026

Sugadaira 2026

2026
8th Anniversary @ Hachioji

8th Anniversary @ Hachioji

2026

Newsstand & Thoughts

RSS Live Syndicate / note, Agentic Paper, The School of Kamos, Kurashi 1980

note @kosuk

note.com →

Agentic Paper

All Articles →

The School of Kamos

Daily Archive →

Kurashi 1980

ZINE Archive →

Get in Touch

Kamos Go Kamos