Open sourceGPL-3.02025
Shuiyin
Batch watermarks, fully local.
Batch-watermark ID cards and documents in the browser — nothing is ever uploaded.
- React 18
- TypeScript
- Vite
- Tailwind CSS
- Canvas
03 · Mini Programs
Your business, one tap away.
Fast-loading mini programs with fewer steps to checkout, connected to your payments, membership and back office — for customers in Hong Kong, mainland China and beyond.
At a glance
- 01One codebaseWeChat, Alipay, Douyin and H5
- 02Payments built inWeChat Pay and Alipay, plus FPS where allowed
- 03Yours to keepAccounts, source code and admin access
Live demo
One codebase, every super-app.
Four screens — a shop, bookings, membership and a live dashboard — each running in a different super-app, all built from the same code.
Swipe to browse
Build once
Write it once. Ship it everywhere.
Taro and uni-app compile one TypeScript codebase into native mini programs and a mobile site — then we tune each build to its platform's rules and review.
src/pages/shop/index.tsx
taro build --typeweapp
One codebaseTaro / uni-app · TypeScript
- WeChatMini program · WeChat Pay
01 · weapp - Alipay & AlipayHKMini program · Alipay payments
02 · alipay - DouyinMini program · video traffic
03 · tt - H5 mobile webAny browser · WhatsApp links
04 · h5
Capabilities
What we can build for you
WeChat, Alipay and Douyin mini programs plus H5 — shops, bookings, memberships and payments that meet customers inside the apps they already use.
01/ 06
WeChat mini programs
Mini programs that feel native and make the most of WeChat login, sharing, subscription messages and Official Accounts.
- One-tap WeChat login
- Subscription messages
- Official Account & WeCom links
02/ 06
Multi-platform & H5
One Taro or uni-app codebase for Alipay, Douyin, Baidu and the mobile web, adapted to each platform’s rules.
- Taro / uni-app
- Alipay, AlipayHK & Douyin
- H5 for browsers & WhatsApp links
03/ 06
E-commerce & loyalty
Shops, group buys and membership programmes that turn first-time buyers into regulars.
- Catalogue, cart & checkout
- Coupons, points & tiers
- Group buys & referrals
04/ 06
Payments & onboarding
WeChat Pay and Alipay built in, plus Hong Kong options like FPS and Octopus where platforms allow — and help setting up merchant accounts.
- WeChat Pay & Alipay
- FPS & Octopus options
- Merchant account setup
05/ 06
Admin & dashboards
Back offices for orders, stock, staff and content, with live dashboards for the numbers that matter.
- Orders & inventory
- Roles & permissions
- Real-time sales dashboards
06/ 06
Cloud & operations
Cloud development for quick launches, or scalable APIs on your own cloud — monitored, backed up and kept in step with platform changes.
- WeChat Cloud & serverless
- Tencent Cloud, Alibaba Cloud, AWS
- Monitoring & version upkeep
Use cases
Where mini programs pay off
- 01Retail
Social storefront
A mini program shop with live stock, coupons and member prices that customers share straight into group chats.
- 02Food & beverage
Scan-to-order & queueing
Table QR ordering, remote queue tickets and digital stamp cards that cut waiting times and bring diners back.
- 03Health & beauty
Bookings & reminders
Appointments, staff rosters, deposits and reminders for clinics, salons and fitness studios.
- 04Events & exhibitions
Registration & check-in
Sign-ups, e-tickets, on-site check-in and interactive floor maps for exhibitions and conferences.
In numbers
What we bring
- Web apps we’ve shipped as open source
- 3
- Served from a single codebase
- 4 platforms
- Local, in-browser processing in Shuiyin — no uploads
- 100%
Stack
Proven tools, reliable architecture
01
Platforms
- Alipay
- AlipayHK
- Douyin
- Baidu
- H5
02
Front end
- Taro
- uni-app
- React
- Vue
- TypeScript
03
Back end & data
- Node.js
- Go
- Java
- MySQL
- PostgreSQL
- Redis
04
Cloud & payments
- Tencent Cloud
- Alibaba Cloud
- AWS
- Docker
- WeChat Pay
- FPS
Process
From idea to launch
- 01≈ 1 week01· ≈ 1 week
Scope & user flows
We map user journeys, platform rules and payment needs, then agree on a feature list and launch date.
DeliverablesFeature listUser flowsLaunch plan - 021–2 weeks02· 1–2 weeks
UX & UI design
Clickable prototypes and a design system that follows each platform’s conventions.
DeliverablesClickable prototypeDesign systemUI assets - 032–4 weeks03· 2–4 weeks
Build & connect
Front end, back end and admin built in parallel, connected to payments, CRM and your existing systems.
DeliverablesPlatform buildsAdmin consoleAPIs & integrations - 04≈ 1 week04· ≈ 1 week
Testing & review
Real-device testing, then we prepare platform review submissions and merchant settings and see them through.
DeliverablesDevice test reportReview submissionMerchant setup - 05Ongoing05· Ongoing
Launch & grow
Go live, watch the data and keep improving with regular releases and campaign features.
DeliverablesAnalyticsRegular releasesCampaign features
Work
Same craft, on the web.
None of our mini programs is public yet. These two open-source web apps come from the same team and the same front-end standards — and they run just as smoothly on a phone.
Open sourceMIT2026
Hlool PDF
An elegant PDF stamping workbench.
Stamp, seam-seal and batch-process PDFs right in the browser — no upload needed.
- Go
- pdfcpu
- React 19
- TypeScript
- Tailwind CSS v4
FAQ
Questions, answered
The number of pages and features, how many platforms you launch on, the payment and system integrations required, and whether you need an admin console. A booking or showcase mini program costs far less than a full e-commerce platform; we scope it with you and quote against a feature list.
A focused mini program usually goes live in 4–8 weeks, including platform review; e-commerce or membership systems with integrations take 2–3 months. The platform review itself typically takes a few working days.
Yes. WeChat accepts overseas entities, including Hong Kong companies, though some categories and features are restricted, and other platforms have their own rules — we’ll advise the right setup for your entity and customers. Every account is registered in your company’s name, user data sits in cloud accounts you control, and you receive the full source code and admin access.
A little, yes. Platforms update their APIs and review rules several times a year, and servers, certificates and payment settings need upkeep. We offer monthly maintenance plans, or we can train your team to take over.
If you only need WeChat and want its deepest features, native is the most direct route. If you need two or more platforms or an H5 version, a cross-platform framework saves real time and cost. We’ll recommend one based on your roadmap.
Something else on your mind?
Ask our AI assistant. It answers from what's on this site, at any hour, in your language.
Next step
Ready to give your idea some gravity?
Tell us what you want to build. We'll reply within one business day with an initial approach and a budget range.