Gemini Nexus

🚀 Professional multi-account AI gateway for Google Gemini & Claude

--- ## 📖 Table of Contents - [Why Gemini Nexus?](#-why-gemini-nexus) - [Features](#-features) - [Screenshots](#-screenshots) - [Quick Start](#-quick-start) - [Tech Stack](#️-tech-stack) - [Development](#-development) - [FAQ](#-faq) - [Contributing](#-contributing) - [License](#-license) --- ## ✨ Why Gemini Nexus? When using AI-powered IDEs and coding tools, have you ever run into these problems? - 😫 Single account quota runs out quickly, requiring frequent manual switching - 🔄 Managing multiple Google/Claude accounts is cumbersome - 📊 Don't know how much quota or tokens you've consumed - 🔌 Need a reliable local API proxy that speaks OpenAI/Anthropic protocols - 🔍 Can't see what's actually being sent/received by the proxy **Gemini Nexus** solves all of these. It's a professional Electron desktop application that acts as an intelligent gateway between your development tools and Google Gemini / Claude AI: - ✅ **Unlimited Account Pool** — Add any number of Google Gemini & Claude accounts - ✅ **Smart Auto-Switching** — Automatically rotates to the next available account when quota is low or rate-limited - ✅ **Real-time Usage Analytics** — SaaS-grade dashboard with area charts, trend indicators, and model distribution - ✅ **Full Proxy Observability** — Live traffic monitor, request replay, and model capabilities inspector - ✅ **OpenAI & Anthropic Compatible** — Drop-in replacement proxy for Cursor, Windsurf, OpenCode, and any OpenAI-compatible tool - ✅ **Secure by Default** — AES-256-GCM encryption with OS-native credential management --- ## 🎯 Features

☁️ Cloud Account Pool

Add unlimited Google Gemini / Claude accounts via OAuth
Display avatar, email, status, and last used time
Real-time status monitoring (Active, Rate Limited, Expired)
Per-account proxy URL configuration
Device identity profile management with history

📊 Usage Analytics Dashboard

Real-time token consumption with 15s auto-refresh
Area charts for daily/hourly prompt & completion tokens
Trend indicators (% change vs previous period)
Inline sparklines on stat cards
Model distribution ranking with horizontal bar charts
Prompt/Completion ratio visualization

🔌 Local API Proxy (Gateway)

OpenAI /v1/chat/completions compatible endpoint
Anthropic /v1/messages compatible endpoint
Full SSE streaming support (tested with Cursor, Windsurf, OpenCode)
Model mapping (e.g. claude-sonnet-4-6 → gemini-3-flash)
Configurable port, timeout, and API key
Model visibility control (show/hide specific models)

🔄 Intelligent Auto-Switching

Unlimited pool mode with smart backup selection
Auto-switch when quota < 5% or rate-limited
Background monitoring every 5 minutes
Graceful fallback with status reason tracking

🔍 Proxy Observability (Advanced)

Traffic Monitor — Live request/response log with latency, status, and model info
Request Replay — Replay any recorded request for debugging
Model Capabilities — Inspect vision, thinking, streaming, JSON mode support per model
Developer Tools — cURL & Python code generation, one-click copy

🔐 Security & Encryption

AES-256-GCM encryption for all sensitive data
OS native credential manager integration (Keytar + SafeStorage)
Auto migration of legacy plaintext data
Encrypted token & quota storage per account

⚙️ Settings & Customization

Dark / Light / System theme support
Multi-language: English & Português (Brasil)
Per-account proxy URL override
Model visibility toggles
Log directory access

🖥️ Desktop Experience

Native Electron app with system tray integration
Collapsible sidebar with persistent state
Responsive layouts across all views
Status bar with live proxy and connection indicators
Error boundaries with user-friendly fallbacks

--- ## 📸 Screenshots

Main

Usage

Proxy

Routing

Docs

Connections

Config

--- ## ⚡ Quick Start ### Prerequisites - **Node.js** v20 or higher - **npm** (this project uses `package-lock.json`) ### Build from Source ```bash # Clone the repository git clone https://github.com/evandrodevbr/GeminiNexus.git cd GeminiNexus # Install dependencies npm install # Start development npm start # Build for production (Windows installer) npm run make ``` ### Using with AI IDEs Once the proxy is running, configure your IDE: ```plaintext # In Cursor / Windsurf / OpenCode settings: API Base URL: http://localhost:10100/v1 API Key: (copy from the Proxy page in the app) Model: gemini-3-flash (or any mapped model) ``` --- ## 🛠️ Tech Stack | Category | Technologies | |----------|-------------| | **Core** | [Electron](https://www.electronjs.org/), [React 19](https://react.dev/), [TypeScript](https://www.typescriptlang.org/) | | **Build** | [Vite](https://vitejs.dev/), [Electron Forge](https://www.electronforge.io/) | | **Styling** | [Tailwind CSS v4](https://tailwindcss.com/), [Radix UI](https://www.radix-ui.com/), [Lucide Icons](https://lucide.dev/) | | **State** | [TanStack Query](https://tanstack.com/query/latest), [TanStack Router](https://tanstack.com/router/latest) | | **Backend** | [NestJS](https://nestjs.com/) (internal gateway), [ORPC](https://orpc.unnoq.com/) (type-safe RPC) | | **Database** | [Better-SQLite3](https://github.com/WiseLibs/better-sqlite3), [Drizzle ORM](https://orm.drizzle.team/) | | **Charts** | [Nivo](https://nivo.rocks/) (Line, Bar, Pie) | | **i18n** | [react-i18next](https://react.i18next.com/) | | **Testing** | [Vitest](https://vitest.dev/), [Playwright](https://playwright.dev/) | --- ## 💻 Development ```bash # Start dev environment (Electron + Vite HMR) npm start # Run linting npm run lint # Type check npm run type-check # Format code npm run format:write # Run tests npm test ``` ### Project Structure ```plaintext src/ ├── actions/ # App actions and flow orchestration ├── components/ # React UI components │ ├── proxy/ # Proxy page components (advanced tabs) │ ├── usage/ # Usage analytics components (StatCard, ChartCard) │ └── ui/ # Base UI primitives (Radix-based) ├── hooks/ # Custom React hooks ├── ipc/ # Electron IPC + database handlers ├── layouts/ # Layout components (MainLayout + sidebar) ├── localization/ # i18n translation resources ├── routes/ # TanStack Router pages (index, usage, proxy, settings) ├── server/ # NestJS backend (proxy gateway service) ├── services/ # Service layer ├── types/ # TypeScript type definitions + Zod schemas └── utils/ # Utility functions ``` --- ## ❓ FAQ

Q: The app won't start?

1. Make sure all dependencies are installed: `npm install` 2. Check if Node.js version is >= 20 3. Try deleting `node_modules` and reinstalling 4. On Windows, ensure the WiX Toolset is available for `npm run make`

Q: Account login failed?

1. Ensure network connection is working 2. Try clearing app data and logging in again 3. Check if the account is restricted by Google/Claude

Q: IDE can't connect to the proxy?

1. Make sure the proxy is running (green indicator in the status bar) 2. Verify the port matches your IDE config (default: `10100`) 3. Copy the API key from the Proxy page and paste it in your IDE settings 4. Check that at least one account is active in the Accounts page

Q: Token counts show zero?

1. This was a known bug in earlier versions — update to the latest version 2. Token tracking now correctly handles streaming metadata and estimated counts 3. Usage data refreshes every 15 seconds on the Usage Analytics page

--- ## 🤝 Contributing Contributions are welcome! Please read `CONTRIBUTING.md` for details. --- ## 📄 License [CC BY-NC-SA 4.0](LICENSE) --- ## ⚠️ Disclaimer > [!WARNING] > **For Educational Purposes Only** > > This project is intended solely for educational and research purposes. It is provided "as-is" without any warranty. **Commercial use is strictly prohibited.** > > By using this software, you agree that you will not use it for any commercial purposes, and you are solely responsible for ensuring your use complies with all applicable laws and regulations. The authors and contributors are not responsible for any misuse or damages arising from the use of this software. --- ## 🙏 Credits **Gemini Nexus** is a significantly enhanced and expanded version of the original project [AntigravityManager](https://github.com/Draculabo/AntigravityManager) created by [Draculabo](https://github.com/Draculabo). All fundamental architecture and design were made by the original author.