[Codex Meetup Japan #1] Codex-Powered Mobile Apps Development

This is the slide, "Codex-Powered Mobile Apps Development" at Codex Meetup Japan 1.
#AI駆動開発 #Codex #aicommunity #techevent

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1. Kenichi Kambara (@korodroid) October 14, 2025 Codex-Powered Mobile Apps Development Codex Meetup Japan #1
2. •Mobile App Development •Talks (23 Int’l/100+ Domestic) •Writings (10 Dev/Edu Books) •[Of fi cial] Evangelist at NTT TechnoCross •[Private] iplatform.org About me ਆݪ ݈Ұ (X:@korodroid)
3. Agenda •The Complexity of Mobile Apps Development •“Chat-based AI” vs. “Agent-based AI” •Codex Walkthrough (Mobile Apps Development)
4. The Complexity of Mobile Apps Development  • Platform Support iOS Android Cross-platform Device diversity Coding Debugging Testing Refactoring Performance Versioning Review guidelines Metadata Release Accessibility Responsive design Localization Usability • Development Process • App Store Requirements • UI/UX
5. Real Pains in Mobile Apps Development  🔁 Repetitive & cross-cutting changes ⚡ Slow iteration loops 🔎 Late discovery of issues 🧪 Thin tests 📱 Device/OS fragmentation
6. Evolving the Developer Work fl ow  $IBUCBTFE
   "* 🧠Gemini 🧠ChatGPT 🧠Claude "HFOUCBTFE
   "* 🛠Cursor 🛠Claude Code 🛠Codex Conversational interface for Q&A, guidance, and ideation. Autonomous, tool-using agents that plan, act, and deliver outcomes.
7. Codex Walkthrough (Mobile Apps Development)
8. Use Case (Add Darkmode Feature)  Before After
9.  Codex Walkthrough (Mobile Apps Development) 1. Launch interactive mode with codex 2. Run /init to create AGENTS.md (project guidelines) 3. Use /approvals to set the approval mode on your preference 4. Prompt Codex: 5.Codex generates the diff → review → approve → automatically applies changes 6.Verify with fl utter run ͜ͷFlutterΧ΢ϯλʔΞϓϦʹμʔΫϞʔυ੾ସΛ௥Ճ͠ɺࠩ෼Λද͍ࣔͯͩ͘͠͞ɻ
10. In-Progress Screenshot 1/2 (Codex)  BQQSPWBMT 6QEBUFE
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11.  .PEJ fi FE
    5FTU$BTF In-Progress Screenshot 2/2 (Codex) 5FTU
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12. Codex makes mobile app development faster, smarter, and safer🚀 Conclusion
13. Facebook:http://fb.com/kanbara.kenichi X:@korodroid LinkedIn:http://www.linkedin.com/in/korodroid Thank you so much Feel free to reach out for technical speeches, writing, or other inquiries.