craftclay K.K.

Engineering reality with code.

We present visions and practical solutions to management and societal challenges through code.

About us

craftclay K.K. supports organizations across media, telecom, distribution, and logistics, from requirements and architecture through PoC, implementation, and operations. We build with an eye for real-world constraints, data, and delivery.

Expertise & Work

Media, security, logistics, and cross-industry systems

Our track record includes DX and system development for broadcast and publishing companies, entertainment and social-media services, secure communications, retail operations, academic research, smartphone apps, and migration programs across broadcast, logistics, apparel, and electronics distribution. We support work from requirements and architecture to PoC, staged cutovers, implementation, and post-migration operations.

Ray Kitajima

Ray Kitajima

Representative

“The concept is intuitive, the algorithms are intricate, and the creators remain deeply human.”

GitHub profile

Products

Owned products and public tools.

macOS diff tool

RibbonDiff

Compare text, files, and Git history in one place, with whitespace filters, Workspace, and Version History.

RibbonDiff

macOS Markdown viewer

MarkPane

Open Markdown files and folders with tabs, search, Mermaid, MathJax, local images, and Mac-native rendering.

MarkPane

AI-powered generative radio studio

Radio Starlight

A generative radio studio where shows are designed segment by segment and connected to RSS/Atom/JSON feeds, APIs, or arbitrary web pages.

Radio Starlight

Writing

Long-form notes on product development, AI-assisted coding, and building Mac-native tools.

RibbonDiff Blog

RibbonDiff and Codex: A calmer way to build software

When Codex can safely write and compile code, the development bottleneck moves from typing to reviewing. RibbonDiff gives that review a calm, visual place to happen.

Contact

We’d love to hear about your challenge. Please reach out via the form below.

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