Alternatives / Antigravity
Looking for an open source Antigravity alternative? We compared 9 open source AI coding agents, editors, and code review tools by license, model choice, IDE and terminal support, and pricing. They range from terminal agents and VS Code extensions to native editors with built-in agents.
Written by Maxime DERAME
Last updated:
| Alternative | Best for | License |
|---|---|---|
| OpenCode | Multi-provider agent in terminal, IDE, and desktop | MIT |
| pi | Minimal, extensible terminal agent | MIT |
| Zed | Fast editor with built-in agents | GPL-3.0-or-later / Apache-2.0 components |
| Cline | Agent inside VS Code | Apache-2.0 |
| Continue | Source-controlled AI checks on pull requests | Apache-2.0 |
| Kilo | 500+ models across IDEs and CLI | MIT |
| CodeEdit | Lightweight native macOS editor | MIT |
| Athas | Lightweight editor with agents | AGPL-3.0 |
| Zero | Terminal agent with explicit permissions | MIT |
We looked for open-source tools that overlap with Antigravity, Google's agent-first development environment: AI coding agents that plan, edit code, and run tasks inside an editor or terminal. We verified each project's license, recent activity, stars, and supported models in its repository. Antigravity is a proprietary IDE built around Google's Gemini models, so we compare the alternatives by where they run and how much model choice they offer. See our methodology for the full criteria.
Zed, CodeEdit, and Athas are code editors, with Zed and Athas including built-in AI agents. Cline and Kilo are agents that run inside VS Code and other IDEs. OpenCode, pi, and Zero are terminal-first agents, and Continue is different again: it runs source-controlled AI checks on pull requests rather than writing code for you.
Zed is the closest as a complete editor with multi-agent workflows, edit prediction, and collaboration. Athas is a lighter all-in-one workspace with a built-in agent, and Kilo and Cline bring agentic coding into VS Code. OpenCode covers terminal, desktop, and IDE with many providers.
OpenCode, pi, Cline, Kilo, and Zero work with many providers using your own keys, and most support local models, so your code does not have to go to Google or any single vendor. Zero keeps sessions on your disk, encrypts API keys locally, and ships without telemetry.
OpenCode, pi, Kilo, CodeEdit, and Zero are MIT, and Cline and Continue are Apache-2.0. Zed's editor is GPL-3.0 with Apache-2.0 components, and Athas is AGPL-3.0.
All nine projects were updated within days or weeks of this update.
Antigravity is a proprietary AI IDE from Google built around its own models, with usage limits and your code and prompts processed in Google's cloud. Open-source alternatives let you inspect the code, bring your own API keys or local models, run agents in your terminal or CI, and avoid tying your workflow to one vendor, at the cost of configuring providers yourself.
| Alternative | Type | License | Where it runs | Best for |
|---|---|---|---|---|
| OpenCode | Coding agent | MIT | Terminal, desktop, IDE | Provider flexibility |
| pi | Terminal agent | MIT | Terminal | Extensibility |
| Zed | Code editor | GPL-3.0 / Apache-2.0 | macOS, Linux, Windows | Fast AI-native editing |
| Cline | IDE agent | Apache-2.0 | VS Code, terminal | Controlled execution |
| Continue | PR checks | Apache-2.0 | GitHub | Enforcing team standards |
| Kilo | IDE and CLI agent | MIT | VS Code, JetBrains, CLI | Model choice |
| CodeEdit | Code editor | MIT | macOS | Native lightweight editing |
| Athas | Code editor | AGPL-3.0 | macOS, Windows, Linux | All-in-one workspace |
| Zero | Terminal agent | MIT | Terminal | Permissioned local agent |
Want a complete AI-native editor
Zed is a Rust editor with built-in agents, edit prediction, LSP, a debugger, and real-time collaboration.
Want the most flexible multi-environment agent
OpenCode works in the terminal, desktop, and IDEs with 75+ providers, LSP support, and parallel agents.
Want an agent in VS Code with approvals
Cline edits files and runs commands in VS Code with Plan and Act modes, using your own API keys.
Want maximum model choice
Kilo supports 500+ models with bring-your-own-key across VS Code, JetBrains, and the CLI.
Want AI checks on every pull request
Continue enforces Markdown checks stored in your repository as GitHub status checks, with suggested fixes.
Want a minimal, hackable terminal agent
pi keeps a small core and extends through TypeScript, with 15+ providers and tree-structured sessions.
Want a permissioned, private terminal agent
Zero supports 25+ providers, stores sessions locally, gates file writes and commands behind permissions, and sends no telemetry.
Want a lightweight native editor on macOS
CodeEdit is a native, MIT-licensed macOS editor focused on performance and simplicity.