Shenzhen, China · App Store Publisher

26 apps shipped.
Yours could be next.

WAHAH is the in-house iOS studio of Shenzhen Fu Kang Heng Development Co., Ltd. We design, build and publish our own apps — health trackers, verification cameras, audio tools and offline utilities. We also build for clients.

Explore the portfolio → Work with us
26Apps live on the App Store
5Product categories
100%Offline-first builds
0Third-party trackers
The portfolio

Every app below was designed, built and published in-house

No templates, no outsourced code. Each one is a native Swift app with its own interface, data model and App Store listing. Tap any card to see screenshots and the full feature breakdown.

What we do

From a blank Xcode project to a live App Store listing

The same team that shipped all 26 apps can ship yours. We work on iOS end to end — product thinking, interface design, native engineering, monetisation and submission.

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Native iOS engineering

Real Swift, not a wrapper. We build with the frameworks Apple ships and keep the codebase clean enough to maintain for years.

  • Swift
  • SwiftUI
  • UIKit
  • Core Data
  • SwiftData
  • StoreKit 2
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Offline-first & privacy by design

Our house style: everything runs on the device. No servers to pay for, no user data to leak, and a clean “Data Not Collected” privacy label.

  • On-device storage
  • No accounts required
  • No analytics SDKs
  • App privacy labels
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Health & wellness tracking

Condition-specific logging, symptom scales, trend charts and clinician-ready PDF reports. We understand the fine line between a wellness tool and a medical claim.

  • Symptom logging
  • Trend charts
  • PDF report export
  • Local reminders
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Camera, audio & sensors

The hard parts of iOS. Real-time signal processing, microphone capture, face tracking and image pipelines, all running smoothly on device.

  • AVFoundation
  • FFT / pitch analysis
  • ARKit face tracking
  • EXIF & hashing
  • Notched audio filters
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Monetisation that fits

One-time unlocks, free trials, subscriptions, family sharing. We pick the model that suits your product rather than defaulting to a monthly fee.

  • StoreKit 2
  • Free trials
  • Lifetime unlocks
  • Paywall UX
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Design, launch & store presence

App icon, screenshots, listing copy, keyword research, review compliance and the submission itself. Then updates and maintenance after launch.

  • UI / UX design
  • App Store assets
  • ASO
  • Review handling
  • Localisation
How it runs

A predictable path from idea to release

You always know what stage we are at, what is finished, and what it costs. No surprise invoices, no silent months.

Scope & spec

We turn your idea into a written feature list, screen map and milestone plan with a fixed price per milestone.

Design

Screen flows and visual design, including the app icon, App Store screenshots and listing copy.

Build

Weekly TestFlight builds you install on your own phone, so you watch it come together instead of waiting for a big reveal.

Test & polish

Real-device testing, edge cases, accessibility, performance, and pre-checking every App Store review guideline.

Launch & support

We submit, handle review feedback, then keep shipping updates as iOS evolves and your users ask for more.

Work with us

Three ways to build your app with WAHAH

Whether you have a finished spec, a rough idea, or an existing product that needs to reach iOS — there is a model that fits.

Full-cycle app development

You bring the idea, we handle everything from spec to App Store approval. Best if you want a finished product without managing a development team.

  • Fixed scope and milestone price agreed upfront
  • Design, engineering, submission and launch included
  • You own the app, the source code and the listing
  • Post-launch support window included

Co-development & revenue share

If the product is strong but the budget is tight, we can build at a reduced upfront cost in exchange for a share of App Store revenue.

  • Lower cash requirement to get started
  • Aligned incentives — we only win when the app earns
  • Suits niche tools with a clear, reachable audience
  • Transparent revenue reporting

White label, porting & support

Already have a product elsewhere, or an iOS app that needs a real owner? We can port it, rebrand it, or take over its maintenance.

  • Android / web to native iOS porting
  • White-label builds with your name and branding
  • Maintenance retainers and iOS update coverage
  • ASO and store presence improvements
Common questions

What clients ask before we start

Straight answers to the questions we get most often. If yours isn’t here, just email us.

Can you build an iOS app for my business?

Yes. We take on client projects alongside our own apps and handle the full cycle: feature spec, UI/UX design, native Swift development, App Store submission and post-launch updates. You own the app, the source code and the App Store listing.

How much does it cost to have an iOS app developed?

It depends on scope. A focused offline app like the ones in our portfolio costs far less than an app with accounts, payments or real-time audio and video. We scope the work first, then quote a fixed price per milestone, so you know the total before development starts. If your budget is tight we can also build on a reduced upfront fee plus a share of App Store revenue.

How long does it take to build and launch an iOS app?

A focused offline app typically takes a few weeks of build time once the spec is agreed. Larger apps with accounts, subscriptions or heavy camera and audio processing take longer. You receive weekly TestFlight builds, so progress is visible from the first week rather than at a single final handover.

Do I own the source code and the App Store account?

Yes. On a commissioned project you own the source code, the app and the App Store listing. We hand everything over on final payment, including the Xcode project, signing assets and store metadata.

What kinds of apps do you specialise in?

Health and medical self-tracking, verification and timestamp cameras, audio and hearing tools, and offline reference utilities. We are strongest where privacy matters: every app in our portfolio runs entirely on the device, with no server, no user account and no third-party analytics.

Will my app collect user data?

Only if it genuinely needs to. Our default architecture is offline-first, so data stays on the user’s device. That means no server costs, no data-breach exposure and a clean “Data Not Collected” App Store privacy label. If you do need cloud features we build them explicitly and tell users what is stored.

Do you work with clients outside China?

Yes. We work with clients worldwide and communicate in English. Our studio is in Buji, Longgang, Shenzhen, China, and we are happy to sign an NDA before you share your idea.

Get in touch

Let’s talk about your app

Tell us what you want to build — or send us a link to the product you already have. We reply to every serious enquiry, and we are happy to sign an NDA before you share details.

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Company Shenzhen Fu Kang Heng Development Co., Ltd.
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Brand WAHAH · WAHAH SHOP on Amazon
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Phone / WeChat +86 189 2387 4158
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Studio address Buji, Longgang, Shenzhen, China

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