College student × indie developer / Haruhiro Ono

YO-KO

Too much research. Numbers that don't add up. Habits that never stick.
I kill each one — with a small web app.

Engineering student at Chitose Institute of Science and Technology, Japan. 37 web apps in 3 months, built with Claude Code. Every project shown here includes who it's for, what problem it kills, and what friction it removes.

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web apps

3 months

build time

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dev cost

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categories

START HERE

37 APPS — WHAT EACH ONE REMOVES

Pick Tools4
Life & Money6
Dev Tools6
SaaS10
iOS App1
AI Tools3
Student Life1
Personality Tests3
Games1

TECH STACK

Next.js 16TypeScriptReactTailwind CSS v4Firebase FirestoreD3.jsReact Native (Expo)Claude APIGemini APIPythonVercelGitHub Actions

WHAT I BUILD FOR CLIENTS

Web Apps & Diagnostic Tools

Tired-of-researching users get an answer instead of more options. Diagnostic tools, comparison engines, and affiliate-optimized apps — from design to deploy in 2–3 days.

AI Integration & Automation

Replace repetitive manual work with Claude or Gemini API. Content generation, GAS automation, chatbot embedding — anything that currently takes a human 30 minutes and shouldn't.

LP & Corporate Sites

Sites that generate inquiries rather than sit there. SEO-structured, Core Web Vitals optimized, and implemented from Figma or a brief. Shipped in 3–5 days.

Let's build together.

LP builds · GAS automation · Diagnostic web apps · AI-integrated tools
Shipped in 3–5 days. DM on X or send an email.

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