This summary describes a production-grade AI chat companion application, developed entirely by one individual, available for exclusive, permanent buyout with full intellectual property transfer. Unlike scripts or clones, this comprehensive full-stack application has been successfully tested on real Android and iPhone devices, verifying both text chat and translation features. The backend is built using FastAPI with 45 audited dependencies, and the frontend deploys Next.js. The AI layer integrates with DeepSeek and supports pluggable providers like OpenAI. It uses PostgreSQL for the database, featuring production-ready voice text-to-speech (TTS) capabilities supported by ElevenLabs. The app includes a privacy-compliance suite and high engineering quality, including 429 tests, 13 typed exceptions, and detailed audit logging. Documentation is extensive, comprising 68 technical documents and accessible design knowledge bases. Verified testing has been performed on a variety of devices, although the application does lack an admin panel, payments integration, and native apps. Certain features, such as voice playback, are yet to be deployed to production. Technical structure covers Python, FastAPI, PostgreSQL, TypeScript, ElevenLabs, among others. The offer includes complete IP and source code transfer, but third-party licenses like LLM API and ElevenLabs are excluded. A transition period of 30 to 60 days with QA support is provided, with a one-time asking price of USD 15,000.