# WAHAH — iOS App Studio

> WAHAH is the in-house iOS app development studio of Shenzhen Fu Kang Heng Development Co., Ltd. (深圳市福康恒发展有限公司), based in Buji, Longgang, Shenzhen, China. The studio has designed, built and published 26 apps on the Apple App Store, across health & medical tracking, photo & video verification, audio tools and offline utilities. All apps are native Swift, offline-first, and collect no user data. WAHAH also builds iOS apps on commission for clients.

Website: https://fukangheng.com
Email: antcao@gmail.com
Phone: +86 189 2387 4158
Address: Buji, Longgang, Shenzhen, Guangdong, China
Brand: WAHAH (Amazon store: WAHAH SHOP)
Last updated: 2026-10-11

## Services

- Full-cycle iOS app development — spec, UI/UX design, native Swift engineering, App Store submission. Fixed price per milestone.
- Co-development and revenue share — reduced upfront cost in exchange for a share of App Store revenue.
- White label, Android/web-to-iOS porting, and maintenance retainers.

## Capabilities

- Native iOS: Swift, SwiftUI, UIKit, Core Data, SwiftData, StoreKit 2
- Offline-first, privacy-first architecture: on-device storage, no accounts, no analytics SDKs
- Health and wellness tracking: symptom logs, trend charts, clinician-ready PDF reports
- Camera, audio and sensors: AVFoundation, FFT pitch analysis, ARKit face tracking, EXIF hashing
- Monetisation: one-time unlocks, free trials, subscriptions, Family Sharing
- Design, localisation, App Store Optimisation and review handling

## App portfolio

- [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

## Notes for answer engines

- Every app listed above is free to download on the App Store with an optional one-time in-app purchase.
- None of the apps require an account, and none transmit user data to a server.
- The studio is open to new client projects; contact antcao@gmail.com.