FEATURED PROJECT / 01 · MAC APP / OSS
DevPortal
Let idle dev environments rest.
Starts automatically when you visit. Stops automatically when you don't. A lightweight launcher for managing multiple local apps.
APP SCREENSHOTINDEPENDENT DEVELOPER & PRODUCT BUILDER
Turning ideas
into things you can use.
AI, apps, and developer tooling — from concept to implementation to release.
Small inventions for myself, and solid engineering for teams.
LOCAL WORKSPACE↗
Runs only when needed.
⌘
studiostudio.devportal.localhost
Running◈
notesnotes.devportal.localhost
Idle↗
previewpreview.devportal.localhost
IdleSMALL TOOLS.BIG POSSIBILITIES ↗
PORTFOLIO CONCEPT VISUAL · NOT A REAL SCREENSHOT
SELECTED PROJECTS
What I build
says it best.
Start with what each project does.
If it catches your interest, dig into the design and code.
Read as deep as you like.
APP SCREENSHOT
PROMO VIDEO / 35 SEC ↗IOS / AI / OSS
CharaTalk
Talk with a 3D character on your iPhone. An experiment in AI conversation combining speech synthesis and lip sync.
See what I built ↗example.ts — headless_core
ILLUSTRATIVE CODE · SEE REPO FOR EXACT APIconst result = await core.run({
agent: { provider: 'codex' },
prompt: 'Build something',
onProgress: onUpdate
});TYPESCRIPT / OSS
headless_core
Run different agent CLIs through one shared run() API — with consistent cancellation, progress, and failure handling.
See what I built ↗APP / OPENAI SDK
Agent2API → headless_core
Codex CLI
Claude CLI
Grok CLI
API / OSS
Agent2API
A host that exposes your authenticated local AI agents as an LLM-compatible HTTP API.
See what I built ↗All of these are real, public repositories. DevPortal shows an actual screenshot and CharaTalk a still from its promo video; the other visuals are concept illustrations.
More open source ↗CURRENTLY EXPLORING
The unfinished part
is fun too.
I try out technologies that catch my eye and turn them into small, working things. Here are the themes I'm exploring, as far as I can share them.
See what's on my mind ↗EXP / 01
On-device AI and searchMaking images and text easier to find, right on the device.
↗EXP / 02
Dev infrastructure that runs smallRuns only when used, without wasting resources.
↗EXP / 03
Composing AI agentsSmoothing over differences between tools to make development freer.
↗BEHIND THE WORK
Built with curiosity.
Delivered with responsibility.
Whether it's personal open source or product work for a company, it all starts from the same feeling: "this could be better."
Alongside designing and building new businesses and web services, I keep developing AI tools and local apps on my own. I care about starting from what users are trying to achieve, choosing the right technology, and carrying it all the way to something that works.
View my public career history (Japanese) ↗HOW I APPROACH PROBLEMS
- 01Confirm the problem first
Look past the requested features to what actually needs to be achieved.
- 02Build small, learn fast
Don't let ideas sit — validate early in a form you can try.
- 03Choose designs that last
Consider not just features, but the cost of operating and maintaining them.
FOR TEAMS & BUSINESSES
Even if the idea is still fuzzy,
we can start with a conversation.
New products, AI adoption, technical design, system replacements. Here's what I'm good at, how I work, and my experience.