Document & data processing
Documents and data still need manual organisation
We build tools for importing and organising data and preparing documents around your formats and rules, keeping the steps that need human review.
Apps · Websites · AI · Business systems
Focus on your business.We handle the technology.
ProApp builds apps, websites, business systems and AI systems for Hong Kong SMEs. We also take over and repair AI-generated code.
Bring us a new idea or a system that needs work. You'll work directly with the founder on planning, development, testing and launch. We also work with clients overseas.
No technical specification needed. Tell us what you need and when you need it.
Built with AI,
but not working properly?
We take over your app or website, fix issues, complete features, and handle testing and launch.
15+years in app and web
development
development
Led by our founderDirect involvement, from decisions to development.
Enterprise and SME clientsOngoing technical work, since our first project together.
Experience with established businessesWork we have contributed to
Our clients include large enterprises and SMEs. Since our first projects together, these clients have continued working with us on their technical needs.
Start with where your project is todayNew project or existing system,
New project or existing system,
we see it through.
Tell us your goals, budget and target date.
We agree what needs to be delivered, then plan development and acceptance.
01 / BUILDNew developmentNeed an app, website
Need an app, website
or internal business system?
Tell us what you want to achieve and what is getting in the way. We help define your requirements and handle design, development, testing and launch.
Mobile apps · Websites · AI features · Business systemsExplore new development
02 / REFINEProject takeover & repairHalfway built,
Halfway built,
but still not launched?
Has your developer left, do key features keep failing, or has an AI-built project stalled before launch? We identify the issues, then complete the agreed repairs, testing and handover.
Vibe Coding · Existing code · Critical feature fixesExplore project takeover & repair
03 / CONNECTAlready running a system,
Already running a system,
and need integration or maintenance?
We can connect payments, orders and customer data, automate workflows and arrange ongoing support around your needs.
Explore integration & maintenanceBusiness system developmentTurn your daily workflow
Turn your daily workflow
into a system that fits.
Document and data processing, quote and order management, internal tools and approvals,
built around the way your company works.
Quote & order management
Quotes, orders and progress are scattered across spreadsheets
We build quote and order systems around your workflow, keeping data, status and follow-up work together.
Internal tools & approvals
Who needs to approve it, and what happens next?
We organise submission, review and follow-up in a system, showing tasks and records according to each team member’s role.
Start with how you work today.
Share a spreadsheet, sample document or the steps you follow to start the discussion.
Software development for Hong Kong SMEs
What would you like to build?
Start with your idea, how it will be used, the features it needs and what we will deliver.
Mobile and web apps
Apps for customer service, bookings, members or staff, starting with the most important workflow.
Websites and customer portals
Business websites, enquiry forms, e-commerce and customer portals that connect to your daily work.
Business systems
Turn spreadsheets, quotations, orders, documents and approvals into trackable workflows.
AI systems and work assistants
AI for documents, company knowledge and multi-step tasks, with access controls and human review.
AI code rescue and takeover
Take over an AI-built app or website and fix sign-in, payment, data and deployment problems.
Have a requirement that is not listed here? Tell us about the app, website, business tool, AI assistant or system connection you have in mind. We can discuss how to build it, what the work involves and when it could fit into the schedule.
Tell us what you needCommon needsIs your project stuck?
Is your project stuck?
Is everyday work taking too long?
Whether you need new features or improvements to an existing system,
we can help with what your business actually needs.
Some common examplesOur services go beyond this list
App & web development
A product idea, but no clear place to start
We turn your idea into an app, website or online platform, from design through to launch.
Project takeover
Your developer stopped responding halfway through
We take over the existing code and complete the remaining features and launch work.
Customer portals
Customers have to ask you for every progress update
We build a customer portal where they can check progress, payments and updates at any time.
Payments & orders
A customer paid, but the order is missing
We fix missing orders and data sync issues, connecting payment, order and fulfilment workflows.
System integration
The same information needs updating in several systems
We connect your existing tools to reduce repeated updates across systems.
AI project takeover
AI got you 80% there, then you got stuck
We take over your AI-built app or website and finish the features your customers need to use it properly.
Something else in mind?
We can assess new products, specialised features and industry workflows against your goals.
Our revision commitment for fixed-price projectsThe features we agree,
The features we agree,
refined until you are happy.
Before delivery, we keep refining the agreed features. Functionality, workflows and interface design can be revised within the project price, until you are happy to sign off.
Work directly with the person building your project-
Refine it until you are happy, without extra revision fees.
Functionality, workflows and interface design can be adjusted to suit your needs. Revisions to the agreed features are included in the quote, so you can give feedback freely before signing off.
-
Review it, try it, then sign off.
We provide working versions during development. Tell us what you would like changed, try the updated version, and keep refining the agreed features until you are happy.
-
Major new features are quoted separately.
Major new features, separate modules or a substantial change of purpose require a separate agreement on scope, cost and timing. Work starts only after you approve.
Clear progress at every stage.
- 01Clarify requirements
- 02Build & refine
- 03Test & review
- 04Launch & hand over
Tell us what you want to achieve.
We agree the features and project price before development and revisions begin.
Fixed-price projectsClear pricing,
Clear pricing,
results you can see.
We agree the features and project price before work begins. During development, you can try working versions and give feedback on functionality, workflows and interface design. Revisions to the agreed features before delivery are included in the quote, with sign-off when you are happy. Major new features or a substantial change of purpose are quoted separately.
Technical consulting & development
≈ US$ 229 / hourEstimated in advance, billed for actual time.
We ask before going over budget.
Fixed-price projects and monthly support can be arranged as needed.
View pricing & budget examplesConverted using ECB reference rates dated 2026-10-05, rounded to whole amounts. Formal quotes are in HKD.
Frequently asked questionsWorking together:
Working together:
what you might want to know
Can you build a new app, website or AI system from scratch?
Yes. We first agree the users, business goals and initial scope, then plan development, testing and launch.
Can you take over code written by AI or another developer?
We can assess the code, account access and unfinished work before agreeing the takeover scope.
How do I start if I am not technical?
Tell us what you want to achieve, or send a link or screenshots.
How do you charge?
We agree the scope, budget and acceptance criteria before starting.View pricing & budget examples.
Do revisions to the agreed features cost extra?
For fixed-price projects, functionality, workflows and interface design within the agreed scope can be revised before delivery until you are happy, with no extra revision fees. Major new features, separate modules or a substantial change of purpose require a separate quote.
Are you taking on new projects?
Our long-term clients have regular development and maintenance commitments. To give each project enough attention, we confirm the scope and available start date before taking on new work. Send your project goals and target completion date, and we will let you know whether we can help and when we can start.
Can you prioritise an urgent project?
Urgent work still needs a confirmed schedule. Describe the issue and your target date, and we will confirm what we can take on, the start date and the cost.
Can you help with small changes or maintenance?
Yes.
Handled personally by our founder
Ask about project availabilityA new project starts with a schedule.
Our long-term clients have regular development and maintenance commitments. To give each project enough attention, we confirm the scope and available start date before taking on new work.