Antigravity-Manager is a professional-grade desktop application (Tauri + React + Rust) that serves as an AI account manager and local proxy gateway. It manages multiple AI service accounts (Google Gemini, Anthropic Claude, OpenAI) by handling OAuth token lifecycle, device fingerprinting, quota tracking (5-hour rolling and 7-day weekly buckets), and subscription tier management (Free/Pro/Ultra). The built-in reverse proxy (Axum HTTP server) translates between different AI provider protocols (OpenAI, Anthropic, Gemini), supports streaming, handles rate limiting with adaptive retry, and provides intelligent request routing with account failover. It also syncs its configuration to popular AI CLI tools (Claude Code, OpenCode, Hermes, etc.) and includes a comprehensive monitoring dashboard, IP security filtering (CIDR blacklist/whitelist), user token management, and a warmup scheduler to prevent quota decay. The application runs as a Tauri desktop app with optional headless/Docker mode for containerized deployment.