An AI drives a real iPhone through your app's screens and writes up what it finds — reproduction steps and screenshots, delivered as a QA report. No SDK to install, no build to hand over. Start with the free diagnostic.
Free diagnostic →Services — Fukuoka, Japan
Done-for-you engineering, from a company that ships its own products
Sites and MVPs carry published estimates; app QA, AI integration, and everything bespoke is quoted per engagement. English, Japanese, and Chinese, direct with the engineer.
01
App QA on Real Devices
Our core service line: an AI runs your app on real iPhones and reports what it finds.
- Free diagnostic
- One-off full sweep
- Monthly patrol plan
02
Our Own Apps
Mobile apps we design, build, and operate ourselves.
- TabiDay — AI travel planning
- Norimachi — bus arrivals & timetables
03
Development & One-off Projects
One-off engagements, from sites and MVPs to AI integration and technical advisory.
- Landing & Site
- App MVP
- AI & LLM Integration
04
Monthly Services
Ongoing care of your server and site, handled for a flat monthly fee.
- Ongoing server & WordPress management
- Monitoring, backups, and security updates
- Monthly reporting
01 — Flagship
App QA on Real Devices
ACCEPTING PROJECTS
If your app is live on the App Store, sharing its URL is all it takes to start.
02 — Our Apps
Our Own Apps
Mobile apps we design, build, and operate ourselves.
TabiDay
LIVE · APP STORE
AI travel planning
AI-powered travel itinerary planning. Tell it where you want to go — it plans the trip in your language, your style.
Norimachi
IOS APP
Bus arrivals & timetables (Fukuoka)
An iOS app that shows nearby stops and approaching buses at a glance, based on Nishitetsu Bus's public information.
Development & One-off Projects
03 — Projects
Build, Automate, Advise
From sites and MVPs to AI integration and technical advisory — every engagement delivered remote-first, to the same standard.
01
Landing & Site
High-craft landing pages, corporate sites, and marketing pages — built to convert.
Landing · Corporate · Marketing
Est. from $3,500
Get in touch →02
App MVP
Ship a production MVP in a focused sprint — web, mobile, or mobile with Appium automation built in.
Web · Mobile · Sprint
Est. from $12,000
Get in touch →03
Automation Script
Custom automation, data pipelines, and dashboards — from a single script to large-scale with monitoring.
Scripts · Pipelines · Dashboards
Est. from $1,800
Get in touch →04
AI & LLM Integration
Put LLMs to work inside your product or workflow — RAG pipelines, API integration, prompt design, and evaluation. Built by a company that ships its own AI products.
LLM · RAG · Evals
Est. from $6,000
Get in touch →05
Business Automation & Internal Tools
Replace spreadsheet rituals and manual handoffs with internal tools that fit how your team actually works — admin panels, workflow systems, back-office automation.
Workflows · Admin · Back Office
Est. from $9,000
Get in touch →06
Localization Engineering
i18n architecture, CJK typography, and native-quality Japanese, English, and Traditional Chinese — engineered and reviewed in-house.
i18n · EN · JA · ZH-TW
Est. from $2,500
Get in touch →07
Legacy Modernization
Careful, test-guarded modernization of aging codebases — audit first, then incremental refactoring and migration without stopping the business.
Audit · Refactor · Migrate
Est. from $3,500 (audit)
Get in touch →08
Technical Advisory
A senior engineer on call — architecture reviews, code audits, build-vs-buy decisions, and spot consulting in English, Japanese, or Chinese.
Reviews · Audits · Spot Consulting
Est. from $2,000
Get in touch →04 — Monthly
Monthly Services
01
Server & WordPress Maintenance
Ongoing management of your WordPress site and server, for a flat monthly fee. From version monitoring, security updates, and daily backups to uptime checks and monthly reports — handled reliably by a small, AI-augmented team. We're also glad to help if you're migrating off a Sakura dedicated server.
- Monitoring, updates, backups, and monthly reports — all in one plan
- Migration support from Sakura dedicated servers and similar (billed as setup)
- Invoice payment (請求書払い) and international credit cards accepted
WordPress · Server · Maintenance
From ¥30,000/month (excl. tax) · Setup from ¥33,000
Free Consultation & Assessment →05 — How We Work
A company, not an agency
RINSAI TECH is a software company in Fukuoka: our own product TabiDay is live on the App Store, and we run our products in production every day — every technique we offer clients is proven on our own product first. Fixed-price work starts within 3 business days of payment, backed by a 30-day warranty. Remote-first, across Japan and abroad, working in English, Japanese, and Traditional Chinese. Scope is agreed in writing before anything is billed.
Remote-First · Fukuoka HQEN · JA · ZH-TWDirect With The Engineer
Prices in USD; checkout adapts to your local currency. ¥ invoicing with a qualified invoice (適格請求書) is available for Japan and compliance needs.
Ongoing maintenance retainers are available — typically 10–15% of build cost per year, or $300–1,000+/month for automation.
06 — Contact
Your idea —we'll build it properly
We reply within one business day — in Japanese, English, or Chinese.
Fukuoka, Japan — JST