OpenGravity

An experimental, lightweight, BYOK (Bring Your Own Key) recreation of the Google Antigravity UI. OpenGravity provides a browser-based, reasoning-enabled IDE with a live xterm.js terminal powered by the WebContainer API. It features direct local file system sync and a proactive autonomous agent capable of orchestrating basic software engineering tasks, running shell commands, and editing files in real-time. It’s currently a work-in-progress though. It works for basic coding tasks, but consider this the "Alpha" version.

Built in pure HTML/CSS/JS for maximum speed and zero installation.

Features

• BYOK (Bring Your Own Key): Total privacy. Currently ONLY supports Gemini API models (e.g. gemini-3.1-pro-preview, gemini-3-flash-preview, gemini-3.1-flash-lite).
• Proactive Agentic Reasoning: Uses advanced thinking models to plan, execute, and validate tasks without constant user intervention.
• High-Performance Terminal: Integrated xterm js with a real Linux-like environment provided by WebContainer API.
• Interactive Tooling: The agent can execute bash commands, handle interactive terminal prompts (y/n), and manage files directly.
• Zero Bloat: No npm install for the IDE itself. Just serve and code.
• Secure by Design: API keys are stored only in your browser's localStorage.