Best Antigravity alternatives

Anthropic's agentic coding tool, running in the terminal, IDE, desktop app, and browser, reading your codebase and editing files with explicit approval.

Open-source VS Code extension that turns the editor into an autonomous coding agent, using your own API key and an approval gate before each action.

AI-first code editor forked from VS Code, with Tab autocomplete, multi-file Agent mode, Composer, and background agents running on Claude, GPT, or Gemini.

GitHub's AI pair programmer for code completion, chat, PR review, and an autonomous coding agent, built into VS Code, JetBrains, Visual Studio, and more.

OpenAI's cloud-based autonomous coding agent, powered by the GPT-5 family, reading a codebase and opening pull requests from written instructions.

Cognition AI's agentic IDE (formerly Codeium), built on VS Code, with the Cascade agent handling codebase-wide reasoning and multi-file edits.

Open-source agentic coding platform with five agent modes, support for 500+ models at no markup, an MCP marketplace, and parallel subagents.

Google's open-source terminal coding agent built on Gemini models with a 1M-token context window. Shut down for free consumer accounts June 18, 2026.