AvatarStudio Hit-an

Web Services

Live products built end to end — from concept and design to implementation and launch

Shopify AppD2C / ECSaaSNext.js
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LIVE

All of these are live, in-production services

Each of these is a web service I built end to end — from ideation and design through implementation and launch — and that is still running today. Open any card to visit the live site.

Sync Master のトップページ
Shopify App
Live
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Sync Master

sync.hit-an.com

Shopify inventory, synced from Google Sheets.

Overview

An inventory sync app that connects Shopify with Google Sheets to bulk-update stock and metafields straight from a spreadsheet — no CSV exports, no copy-paste — and keeps everything current on a schedule.

Key features
  • Selective sync: paste SKUs/barcodes to update only chosen items
  • Whole-sheet sync to a location in one run
  • Map columns to auto-normalize and update metafields
  • Scheduled automation: daily, monthly, or custom
  • Test connection previews column mapping before running
  • Multi-location sync across warehouses
Tech stack
Next.jsTypeScriptTailwind CSSShopify AppVercel
sync.hit-an.com
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SUMI 墨 のトップページ
D2C Brand / E-commerce
Live
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SUMI 墨

sumi.hit-an.com

Drawn in Tokyo, printed in the USA.

Overview

A D2C brand printing graphics drawn in a Tokyo studio onto heavyweight tees, made to order in the United States. Storefront and design studio live in one Next.js app, running a single flow from artwork generation and LINE approval through listing, checkout, production orders and shipping notices — no inventory, each piece printed after it sells.

Key features
  • A pipeline that generates one design a day and takes approval or rework over LINE
  • Rework notes feed back into later generation prompts automatically
  • Stripe Checkout with idempotent production orders placed from the webhook
  • Order lookup with no account — just an emailed verification code
  • Automated order and shipping emails with send-once guarantees
  • A quality gate checking print size and transparency before listing
Tech stack
Next.js 15React 19PrismaNeon PostgresStripePrintifyOpenAIVercel
sumi.hit-an.com
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stockfront のトップページ
SaaS / Site Builder
Live
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stockfront

stockfront.app

Answer a few questions. Get a site you can publish as-is.

Overview

A multi-tenant site-building SaaS for small businesses, shops, and independent lodging. Answer a few questions and AI assembles the structure, copy, palette, and photography; pick one of four layout samples and that becomes the site. Building is free — decide to publish once you have seen it — and afterwards the copy and images are edited in-house rather than through an agency.

Key features
  • AI builds structure, copy, palette, and photo picks from your answers
  • Four layout proposals of the same content to choose from
  • 19 content modules: products, menus, case studies, staff, hours, and more
  • Unlimited self-service edits to copy, photos, and modules after launch
  • Publish-after-payment monthly plan on Stripe, with custom domains provisioned automatically
  • Tenant isolation via Postgres RLS, plus friendly and pro admin skins
Tech stack
Next.js 15React 19Neon PostgresDrizzle ORMClerkStripeOpenAIVercel
stockfront.app
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Development & Inquiries

How we build

Problem Discovery
Business challenge deep-dive
Structure Design
Proposal from existing LP designs
UI & Visual Tuning
Design refinement
Implementation
Responsive coding

Tools & Tech

Claude Code
Next.js
Tailwind
Vercel
HubSpot
Responsive DesignForm OptimizationAnimationPerformanceAccessibilitySEO Ready