ACGTI (ACG Type Indicator) is a production-grade, open-source web application that delivers a personality quiz matching users to anime characters based on MBTI dimensions. The frontend is a Vue 3 SPA with TypeScript, Vite, and vue-router, featuring 39 Likert-scale questions, 8 archetypes, and over 100 curated characters with multilingual support (zh-CN, zh-TW, en, ja). The backend runs on Cloudflare Pages Functions with D1 database for anonymous statistics collection, AI-generated insights via Workers AI, and a cron worker for periodic stats snapshots. The codebase includes extensive offline analysis scripts (Python and Node.js) for weight calibration, probability simulation, and data validation, demonstrating a hybrid character with strong data engineering practices. The architecture is clean: frontend scoring engine is decoupled from backend, i18n is well-structured, and CI/CD pipelines enforce data integrity. While the project is actively maintained and uses modern tooling, some manual synchronization points (e.g., count constants, duplicate data sources) introduce minor fragility.