Web App & Service Development
We build scalable web apps and SaaS products, from concept to launch — working through the whole flow together with our clients to raise service quality.
SaaS Web App API
Learn more Hong Kong · Software Studio
Start with a working prototype — zero upfront cost.
We build something real first, AI-driven and fast. Then, looking at a working prototype together, we decide what problem your service should solve — and what it should become. Flexible and quick, we turn your first step into a solid one.
HK$0
Upfront-cost prototype
Days
To something working
2019
Founded in HK
SERVICES
What we do
End-to-end software development, from idea to operation.
Web App & Service Development
We build scalable web apps and SaaS products, from concept to launch — working through the whole flow together with our clients to raise service quality.
SaaS Web App API
Learn more 
Website Production & Management
From design and build to post-launch operation and growth support, we provide a consistent, end-to-end service.
Website Ops SEO
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App Development
We develop iOS / Android mobile apps, supporting everything from UI/UX design to release and maintenance.
iOS Android UX
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AI-Driven Development
We reshape the development process with the latest AI technology, shipping products with more speed and higher quality.
AI Automation Efficiency
Learn more JAPAN × HONG KONG
Japan's engineering, delivered in Hong Kong
Development is handled by Japanese engineers. Through collaboration with Japanese companies and Japan's cutting-edge AI, we bring Japan-grade craft to your project — right here in Hong Kong.
Japanese engineers on the build
From requirements to implementation, Japanese engineers do the work with careful communication and Japan-grade quality standards, keeping misalignment to a minimum.
Partnered with Japanese companies
We work alongside Japanese partner firms, bringing proven technology, a solid delivery setup, and the latest Japanese know-how to every project.
Powered by Japan's advanced AI
Some of the most advanced AI is hard to access from Hong Kong. We tap Japan’s technology and environment to bring it into development — pairing speed with quality.
AI DEVELOPMENT FLOW
How we actually build with AI
Track records are hard to judge from the outside — so we show how we work instead. AI runs through every stage, letting a small team ship fast and reliably.
01
Discovery & design
We put your idea into words together and draft the spec in one go.
02
AI-driven prototyping
A working prototype in days — we discuss with something you can actually touch.
03
Review & iterate
Adjust direction on the spot while looking at the real thing — no wasted build.
04
Build & test
Engineers safeguard quality as we move steadily into full development.
05
Ship & operate
Launch is not the end — we measure and keep improving.
AI runs through every stage — accelerating and automating
Why it is fast
Traditional development weeks+
AI-driven development days+
Same quality bar, every stage compressed with AI — which is exactly why a zero-upfront-cost prototype is possible.
TRY IT NOW
Experience it before you believe it
Describe your idea and AI drafts a prototype plan on the spot — a miniature of the zero-upfront-cost prototype we start every project with.
PROTOTYPE FIRST
Build first, then talk.
Conversations start around something real — not a spec document. Here is how a project begins with a zero-cost prototype.
- HK$001
Free consultation
No pitch deck needed. Just tell us what you want to build — even if it is still fuzzy.
- HK$002
AI-driven prototype (HK$0)
We build a working prototype in days, AI-driven, at zero upfront cost.
- HK$003
Talk over the real thing
Together we explore the prototype and pin down the problem worth solving — and the shape of the service.
- 04
Full development
Once the direction is clear, we move straight into full development — flexible and fast. If it does not click, you can simply stop here.
From consultation to a working prototype and our proposals — steps 1–3 are all zero upfront cost. See something real before deciding on full development.
CAPABILITIES
Our tech stack
The core technologies we build with.
Frontend
React Next.js Astro TypeScript Tailwind CSS
Backend
Node.js Python Go REST / GraphQL PostgreSQL
Mobile
React Native Swift Kotlin Flutter
Cloud & DevOps
AWS Cloudflare Docker CI/CD Cloudflare Pages
AI
LLM integration RAG AI-assisted dev Automation
COMPANY
Company
- Company
- GrowHub Limited
- Founder & CEO
- Mika Nakamura (Carmen)
- Founded
- 17 April 2019
- Address
- 21/F., Kam Fung Commercial Building, 2-4 Tin Lok Lane, Wanchai, Hong Kong
NEWS
Latest news
We renewed our corporate website
We have renewed our corporate website with a fresh design and a modern technology stack. Thank you for your continued support.
Corporate registration completed
We completed our corporate registration on 17 April 2019. Thank you sincerely to everyone who has supported us.
FAQ
Frequently asked questions
Common questions about our "build first, then talk" way of working.
Is it really zero upfront cost? How far is free?
Yes. The free consultation, the AI-driven working prototype, and our proposal (steps ①–③) are all zero upfront cost. You decide whether to move into full development only after seeing something real.
How soon can I see something working?
Depending on scope, a working prototype can be ready in a matter of days. We deliberately keep the first step fast and light so you see results early.
What kinds of projects can you take on?
Web apps and SaaS, website production and operation, iOS / Android mobile apps, and AI-driven development — end to end, from idea to launch and beyond.
You use a lot of AI — is quality reliable?
We pair AI-assisted coding, review and testing with engineer oversight, so quality stays dependable even at high speed. AI accelerates the work; it does not replace review.
What if the prototype is not a fit — can I stop?
Absolutely. If the direction does not feel right after seeing the prototype, you can stop there with no full-development cost. Validate first, invest later.
Which languages and regions do you support?
We are based in Hong Kong and work in English, Traditional Chinese and Japanese, collaborating remotely with clients in Hong Kong and overseas.