How to Install VS Code Marketplace Extensions in Google's Antigravity IDE (Example: DeepBlue Theme)

Google's new Antigravity IDE has been gaining attention for its speed, simplicity, and cloud-native developer experience. Like VS Code, it supports extensions—but with one important difference:

🔹 Antigravity uses the OpenVSX registry, not the Visual Studio Marketplace.

This means many popular VS Code extensions simply don't appear in Antigravity's Extensions view. If your favorite theme or tool isn't available on OpenVSX, you won't see it in the search results—even though it works perfectly inside Antigravity.

Recently, I ran into this problem while trying to install my favorite theme: DeepBlue, part of the trae-themes package. It exists on the VS Code Marketplace, but not on OpenVSX.

So… I installed it manually.

This guide walks you step-by-step through how to install any VS Code Marketplace extension (.vsix) into Antigravity using its command-line interface.

#Installing the DeepBlue Theme in Antigravity

This walkthrough documents how I installed the DeepBlue theme (inside the yanfeixin.trae-themes extension) manually in Antigravity.

#🔍 Problem

When searching for "Deep Blue" or "trae-themes" in Antigravity's Extensions panel, nothing appeared.

Why? Because:

• The extension exists only on the Visual Studio Marketplace
• Antigravity pulls extensions only from OpenVSX by default

As a result, Antigravity was unable to find or install it directly.

#✅ Solution

By manually downloading the extension's .vsix file and installing it with the Antigravity CLI, we bypass the registry limitations completely. This method works for any VS Code Marketplace extension—not just themes.

#Step-by-Step Guide

#1. Identify the Extension

I located the extension on the VS Code Marketplace: yanfeixin.trae-themes

This package contains the DeepBlue color theme I wanted to use.

#2. Download the VSIX

You can download the .vsix file directly using the Marketplace asset link.

Here's the exact command used:

curl -L -o trae-themes-1.0.1.vsix "https://yanfeixin.gallerycdn.vsassets.io/extensions/yanfeixin/trae-themes/1.0.1/1737736552124/Microsoft.VisualStudio.Services.VSIXPackage"

This fetches the 1.0.1 version of the extension and saves it locally.

#3. Install Using the Antigravity CLI

Antigravity includes its own CLI—not the same as code or cursor.

The binary is located inside the application bundle: /Applications/Antigravity.app/Contents/Resources/app/bin/antigravity

To install the extension:

/Applications/Antigravity.app/Contents/Resources/app/bin/antigravity --install-extension trae-themes-1.0.1.vsix

After a second or two, the extension is successfully registered inside Antigravity.

#4. Reload & Verify

Once installed:

1. Reload the Antigravity window
2. Open the Command Palette → "Color Theme"
3. Confirm that Deep Blue now appears in the theme list

The theme applied instantly—working perfectly.

#Key Learnings

#1. Antigravity Has Its Own CLI

If you want extensions to appear inside Antigravity, you must use: antigravity --install-extension

Using code --install-extension won't work—it installs extensions only for VS Code or Cursor.

#2. Extensions Are IDE-Specific

Each VS Code-compatible editor (VS Code, Cursor, VSCodium, Antigravity) maintains its own extension registry and install path.

This means:

• Installing an extension for one does not make it available to the others.
• Antigravity requires installation via its own CLI.

#Wrapping Up

Even though Antigravity relies on OpenVSX, you're not limited to what's published there. With a simple manual workflow, you can install:

• Themes
• Tools
• Language extensions
• Snippet packs
• UI add-ons

…as long as they are packaged as a .vsix.

For me, manually installing Deep Blue brought my preferred coding aesthetic back into Antigravity—and it works flawlessly.

If you're customizing your environment or migrating from VS Code, this method makes Antigravity feel instantly familiar.