Product definition
Problem, audience, first flow, launch shape
Independent product studio
A product developer who carries ideas into working software.
I handle the full product path directly: problem framing, interface design, frontend, backend, launch assets, release checks, and the operating flow after launch.
7
operated products
4
Sognora Android apps
16
case pages
Operating product index
AI study, receipt OCR, fortune content, ingredient scanning, HVAC field tools.
PuanAI
Web-first IELTS practice product with AI scoring across all four skills.
Web
Kedigram
AI fortune service available on the web and App in Toss, with readings, crystals, Veda messages, gacha tickets, and Spirit Guide collection.
Web / App in Toss
Paint Preview AI
AI web simulator for surface detection and exterior paint previews.
Web
Receipt Snap
An AI expense app that turns receipt photos into reviewable entries.
Android
Build scope
The work is not limited to screens. It includes the supporting system needed to release and operate the product.
Frontend and app
Next.js, Flutter, Android, webview, localized UI
Backend and ops
API, auth, payment, export, reminders, admin flows
Launch assets
Store copy, screenshots, landing, SEO, release checks
Operating
Current products
A focused list of web products and Android apps currently in operation.
Operating
PuanAI
Web-first IELTS practice product with AI scoring across all four skills.
PlatformWeb
LanguagesTurkish / English / Korean
IELTSAI4 Skills
Operating
Kedigram
AI fortune service available on the web and App in Toss, with readings, crystals, Veda messages, gacha tickets, and Spirit Guide collection.
PlatformWeb / App in Toss
LanguagesEnglish / Korean / Turkish
AI FortuneSajuTarot
Operating
Paint Preview AI
AI web simulator for surface detection and exterior paint previews.
PlatformWeb
LanguagesEnglish / Korean
AISimulationB2B
Operating
Receipt Snap
An AI expense app that turns receipt photos into reviewable entries.
PlatformAndroid
LanguagesEnglish / Korean / Spanish
FinanceAIOCR
Operating
NeiboCheck
Enter a German utility bill and inspect unusual costs, deadlines, and next steps.
PlatformAndroid
LanguagesEnglish / German
GermanyRulesDeadline
Operating
Halal Lens
Scan ingredient labels directly and classify halal, haram, or mushbooh.
PlatformAndroid
LanguagesEnglish / Arabic / Korean
FoodOCRMultilingual
Operating
RefriPro
Offline-first HVAC field app for PT charts, error codes, and PDF service reports.
PlatformAndroid
LanguagesEnglish / Korean
HVACOfflinePDF
Delivered
Delivered and archived work
Client projects and older systems are separated from operated products so the portfolio does not blur different types of work.
W Club
DeliveredPrivate matching service that connects screening, appointments, reviews, and payments.
Matching / Concierge / Membership
TalkCar
DeliveredMobile bridge for web commands, device sockets, downloads, and firmware updates.
Automotive / Hardware / WebView
UBcare E-Document
DeliveredAndroid workflow app for e-documents, signatures, verification, and approval.
Enterprise / Android / E-Signature
MenuBoss TV
ArchiveA Kotlin-based Android TV signage app that keeps store screens running and pulls in operator content updates through gRPC events the moment they happen.
Signage / Android TV / Playback
MenuBoss Operator App
ArchiveA Flutter-based multi-brand operator tool for managing signage devices across stores, pairing them by QR, and pushing new content from a phone in one tap.
Operator / Mobile / Scheduling
ody
ArchiveA Flutter-based chronic-condition app that records daily blood pressure, glucose, and steps, with medication reminders and weekly and monthly reports.
Healthcare / Chronic Care / Flutter
Make Moment
ArchiveA Flutter custom-commerce app that ties together canvas-based cake decoration, order entry, and WebView-based KG Inicis checkout.
Commerce / Customization / Flutter
Kookmin PT
ArchiveFitness service with discovery and community flows, backed by Android architecture and release automation.
Fitness / Community / Android
Flowy
ArchiveAssistive Android camera app for low-vision users with real-time enhancement and recognition support.
Accessibility / Camera / AI
Healthcare Voice Interaction
ArchiveAndroid healthcare pilot connecting Galaxy Watch data collection with tablet voice guidance.
Healthcare / Tablet / Voice
PK
Politics King and OCR R&D
ArchiveData and research project combining civic-data automation with Korean OCR evaluation tooling.
Civic Data / OCR / Dashboard
Product idea, internal tool, or first usable version?
Send the current problem, a rough scope, or a reference link. The first response can start from product structure and launchable scope.