# National Power Trainer (MisterMoon, 미스터문)

> nationalpowertrainer.com is the official website of 미스터문 (MisterMoon), a registered sole proprietorship that builds National Power Trainer and the apps below. One-person software studio in Gwangmyeong-si, Gyeonggi-do, Republic of Korea. Founded 2026-06 by Seungha Moon (문승하), a Boeing 737 first officer. 20+ products in seven months (since 2026-03): apps for problems in the cockpit, while studying, and at home. Built with Claude Code as primary engineer, Claude Design for design, and Codex as a second reviewer.

- Legal name: 미스터문 (sole proprietorship, application software development and supply)
- Website: https://nationalpowertrainer.com/
- Email: hello@nationalpowertrainer.com
- App Store developer: https://apps.apple.com/kr/developer/seungha-moon/id6792546153 (seller: SEUNGHA MOON)
- GitHub: https://github.com/LarryMooon
- Scale (approx.): ~220K lines of Swift, ~200K lines of TypeScript, ~6,000 App Store first downloads

## Shipped
- [FMC TYPER](https://apps.apple.com/app/id6792546151) — LIVE (iOS). Typing game on a 1:1 Boeing 737NG FMC/CDU keypad. SwiftUI, SpriteKit, StoreKit 2. First commit to App Store submission in 2 days.
- [Cramcard / 머리에꽂아주는 암기장](https://larrymooon.github.io/gyeongni-study-site/) — LIVE (iOS). Spaced-repetition flashcards you see, hear, write and say; built for the founder's wife's Russian study. SwiftUI, SwiftData; no login, no server.
- [Dinero / 디네로 가계부](https://larrymooon.github.io/dinero-site/) — LIVE (iOS and Mac App Store). Shared household ledger for couples; CloudKit sharing, foreign currency tied to exchange records.
- [GPS Relay](https://larrymooon.github.io/gpsrelay-site/) — IN REVIEW (iOS). Relays iPhone GPS over Bluetooth to a Wi-Fi-only iPad for ForeFlight and FliteDeck Pro (GDL 90).
- [Howmuchusage / 얼마나썼나](https://github.com/LarryMooon/howmuchusage) — LIVE, open source. Mac menu bar app showing remaining Claude and Codex usage.

## Client work
- [ROTATE](https://rotate.kr) — LIVE. Website for a 24-hour flight simulator center near Gimpo Airport.
- [ROTATE RESERVE](https://rotatereserve.com) — LIVE. Site for a premium A320 simulator center.
- [UNA Macaron / 유나마카롱](https://yuna-macaron-demo.yuna-macaron.workers.dev) — LIVE DEMO. Photo-printed macaron ordering with live preview; React 19, Hono on Cloudflare Workers.

## Flagship
- National Power Trainer / 국가권력급트레이너 — RELAUNCHING. Trainer-first SaaS for freelance personal trainers (members, packages, schedules, signed session logs, documents, money). Next.js 16, Postgres, Cloud Run. Forked from O'un'Wan. Developed with a three-agent loop (Claude app detects → Claude Code implements → Codex verifies). Current meal analysis uses Gemini; next: building its AI features on the Claude API.

## In development
- ATC RUSH — fifth FMC TYPER game (TestFlight).
- CockpitFlow — life-size 3D 737NG cockpit on iPhone for practicing flows (RealityKit).
- Spread — infinite reading board for iPad.
- Bullet Factory / 총알키우기 — idle merge game for iPhone.
- PMP — internal system for an aviation study-abroad agency.

## Paused and archived
- O'un'Wan / 오운완 — ARCHIVED; gym operations app built in 9 days, forked into National Power Trainer.
- ALPHA — ARCHIVED; English book reader deployed to Cloud Run.
- SOWTSO — PAUSED; first-person 3D shelf-tidying game in Unity.
- Live Interpreter / 실시간 통역 — ARCHIVED; on-device speech translation plateaued near 70% word coverage.

## Lab
promo-video (Claude skill), REELS SHORTS, SHORTCUT, frame transform, Exam Bank, Logbook OCR.

## Pages
- [Home](https://nationalpowertrainer.com/)
- [Privacy](https://nationalpowertrainer.com/privacy.html)