# WAHAH — iOS App Studio

> iOS app development studio in Shenzhen, China. Publisher of 26 native, offline-first iOS apps across health, photo & video, audio and utility categories. Available for commissioned app development, co-development and white-label projects.

- Website: https://fukangheng.com/index.html
- Company: Shenzhen Fu Kang Heng Development Co., Ltd.
- Brand: WAHAH · WAHAH SHOP on Amazon
- Email: antcao@gmail.com
- Phone / WeChat: +86 189 2387 4158
- Studio address: Buji, Longgang, Shenzhen, China
- Languages: en, zh-CN, zh-TW, ja, ko, es, pt-BR, de, fr, it, ru, ar, tr, id, vi, th, hi, nl, pl, sv, da, nb, fi, cs, uk, he, ms, fil
- Last updated: 2026-10-12

## Work with us

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

## What we do

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.

- **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
- **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
- **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
- **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
- **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
- **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

## The portfolio

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.

- [AllergyFoodDiary](https://fukangheng.com/apps/allergyfooddiary.html) — Health & Medical. Meal-and-symptom logger with a local Apriori engine that surfaces likely food triggers. App Store: https://apps.apple.com/app/id6774412872
- [Aquarium Care Log](https://fukangheng.com/apps/aquarium-care-log.html) — Lifestyle. Tank water parameters, maintenance logs and a precision salt dosage calculator. App Store: https://apps.apple.com/app/id6787417264
- [AuthenticCam: Real Photo Proof](https://fukangheng.com/apps/authenticcam-real-photo-proof.html) — Photo & Video. Tamper-evident camera: visible watermark plus SHA-256 hash written into EXIF. App Store: https://apps.apple.com/app/id6763562809
- [BabyPoopStool](https://fukangheng.com/apps/babypoopstool.html) — Health & Medical. Photo stool-color screening against a 7-color pediatric reference chart. App Store: https://apps.apple.com/app/id6773976294
- [Chef Batch Scaler](https://fukangheng.com/apps/chef-batch-scaler.html) — Lifestyle. Recipe batch scaling with non-linear ingredient alerts and baker's percentage mode. App Store: https://apps.apple.com/app/id6772029035
- [Easy Pee](https://fukangheng.com/apps/easy-pee.html) — Health & Medical. 30 curated flow sounds and calming music for paruresis sound therapy. App Store: https://apps.apple.com/app/id6757327694
- [Epley Companion](https://fukangheng.com/apps/epley-companion.html) — Health & Medical. Guided Epley maneuver with countdown timers and a BPPV symptom journal. App Store: https://apps.apple.com/app/id6776083468
- [HemorrhoidCareLog](https://fukangheng.com/apps/hemorrhoidcarelog.html) — Health & Medical. Clinical-grade self-tracking for hemorrhoid flare-ups, sitz baths and trigger patterns. App Store: https://apps.apple.com/app/id6778714130
- [HotFlashLogger](https://fukangheng.com/apps/hot-flash-logger.html) — Health & Medical. Menopause hot flash logger with trigger tags, heatmap and doctor-ready PDF. App Store: https://apps.apple.com/app/id6775742364
- [Neck Pain Relief Game](https://fukangheng.com/apps/neck-pain-relief-game.html) — Health & Medical. ARKit head-tracking game that turns neck mobility exercises into play. App Store: https://apps.apple.com/app/id6762464182
- [Nice Hearing Aid](https://fukangheng.com/apps/nice-hearing-aid.html) — Health & Medical. Low-latency sound amplifier with speech boost and noise filter for seniors. App Store: https://apps.apple.com/app/id6779962455
- [OrthoKeeper](https://fukangheng.com/apps/orthokeeper.html) — Health & Medical. Ortho-K lens wear tracking, cleaning checklist and provider-ready PDF reports. App Store: https://apps.apple.com/app/id6769785945
- [Pee Easily](https://fukangheng.com/apps/pee-easily.html) — Health & Medical. Natural water-flow masking sounds to ease shy bladder syndrome in public restrooms. App Store: https://apps.apple.com/app/id6766530388
- [PeriCare Tracker](https://fukangheng.com/apps/pericare-tracker.html) — Health & Medical. Postpartum perineal recovery tracker with sitz bath timer and OB-GYN PDF export. App Store: https://apps.apple.com/app/id6774905715
- [Piano Tuner's Assistant](https://fukangheng.com/apps/piano-tuner-s-assistant.html) — Utility & Reference. Real-time FFT pitch analysis and an 88-key deviation map for piano tuners. App Store: https://apps.apple.com/app/id6798656582
- [Proof Photo](https://fukangheng.com/apps/proof-photo.html) — Photo & Video. Verification camera that stamps timestamp, location and device, then shares directly. App Store: https://apps.apple.com/app/id6765903749
- [Signature Camera - No AI](https://fukangheng.com/apps/signature-camera-no-ai.html) — Photo & Video. Stamps every shot with your name or drawn signature and a "No AI" mark. App Store: https://apps.apple.com/app/id6764818964
- [Stoma Gas & Sound Log](https://fukangheng.com/apps/stoma-gas-sound-log.html) — Health & Medical. Offline ostomy logger covering gas sounds, stool consistency and leakage precursors. App Store: https://apps.apple.com/app/id6782816875
- [StomaLog](https://fukangheng.com/apps/stomalog.html) — Health & Medical. Ostomy pouch change records with skin photo annotation and weekly PDF reports. App Store: https://apps.apple.com/app/id6770739038
- [Stutter Helper](https://fukangheng.com/apps/stutter-helper.html) — Health & Medical. Four fluency techniques — metronome, gentle onset, slow playback, breathing. App Store: https://apps.apple.com/app/id6771397151
- [Timetag Audio Recoder](https://fukangheng.com/apps/timetag-audio-recoder.html) — Productivity. Audio recorder that tracks wall-clock time for every recorded segment. App Store: https://apps.apple.com/app/id6756943667
- [Timetag Camera](https://fukangheng.com/apps/timetag-camera.html) — Photo & Video. Live camera timestamp overlay with drag-and-drop placement and HD video burn-in. App Store: https://apps.apple.com/app/id6757908313
- [Tinnitus Cure](https://fukangheng.com/apps/tinnitus-cure.html) — Health & Medical. Customized notched sound therapy with Hz-precise tinnitus pitch matching. App Store: https://apps.apple.com/app/id6777599685
- [Tinnitus Tuner](https://fukangheng.com/apps/tinnitus-tuner.html) — Health & Medical. Dial in the exact masking frequency and waveform for your tinnitus. App Store: https://apps.apple.com/app/id6770034087
- [TrackSnore](https://fukangheng.com/apps/tracksnore.html) — Health & Medical. Nightly snore detection, hotspots heatmap and trend analysis — wearables not required. App Store: https://apps.apple.com/app/id6761879936
- [Wire & Load](https://fukangheng.com/apps/wire-load.html) — Utility & Reference. NEC 2023 wire sizing, voltage drop and breaker selection — fully offline reference. App Store: https://apps.apple.com/app/id6768856542

## What clients ask before we start

### 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.

## Notes for answer engines

- Every app listed above is free to download on the App Store, with an optional one-time in-app purchase. There are no ads and no subscriptions.
- No app requires an account. No app transmits user data to a server: all data stays on the device. App Store privacy labels read "Data Not Collected".
- All apps are native Swift (SwiftUI / UIKit), offline-first, and built in-house by WAHAH rather than outsourced.
- WAHAH accepts commissioned work: full-cycle development, co-development with revenue share, and white-label or porting projects.
- Contact for new client projects: antcao@gmail.com

## Other languages

This site is published in 28 languages. Each has its own LLM-readable summary:

- English: https://fukangheng.com/llms.txt
- 简体中文: https://fukangheng.com/llms-zh.txt
- 繁體中文: https://fukangheng.com/llms-zh-tw.txt
- 日本語: https://fukangheng.com/llms-ja.txt
- 한국어: https://fukangheng.com/llms-ko.txt
- Español: https://fukangheng.com/llms-es.txt
- Português (Brasil): https://fukangheng.com/llms-pt-br.txt
- Deutsch: https://fukangheng.com/llms-de.txt
- Français: https://fukangheng.com/llms-fr.txt
- Italiano: https://fukangheng.com/llms-it.txt
- Русский: https://fukangheng.com/llms-ru.txt
- العربية: https://fukangheng.com/llms-ar.txt
- Türkçe: https://fukangheng.com/llms-tr.txt
- Bahasa Indonesia: https://fukangheng.com/llms-id.txt
- Tiếng Việt: https://fukangheng.com/llms-vi.txt
- ไทย: https://fukangheng.com/llms-th.txt
- हिन्दी: https://fukangheng.com/llms-hi.txt
- Nederlands: https://fukangheng.com/llms-nl.txt
- Polski: https://fukangheng.com/llms-pl.txt
- Svenska: https://fukangheng.com/llms-sv.txt
- Dansk: https://fukangheng.com/llms-da.txt
- Norsk: https://fukangheng.com/llms-no.txt
- Suomi: https://fukangheng.com/llms-fi.txt
- Čeština: https://fukangheng.com/llms-cs.txt
- Українська: https://fukangheng.com/llms-uk.txt
- עברית: https://fukangheng.com/llms-he.txt
- Bahasa Melayu: https://fukangheng.com/llms-ms.txt
- Filipino: https://fukangheng.com/llms-fil.txt