# Downloads and SDK

> Where to download CatSuite, CatBridge for Windows and Linux, the 1.4.0 extension SDK and CatSuite Studio for VS Code, with official links and SHA-256.

- Language: en
- Canonical URL: https://netcattest.com/catsuite/en/docs/downloads
- Section: Get started
- Updated: 2026-10-06
- Other language (pt-BR): https://netcattest.com/catsuite/docs/downloads

Everything you need to use CatSuite and write extensions, in one place. The app is **free**, with no subscription and no paywall, and the developer tools live at official addresses: **GitHub** for downloads and source code and the **Visual Studio Code Marketplace** for the CatSuite Studio extension.

| What | Official download |
|---|---|
| CatSuite app (Android) | [Google Play](https://play.google.com/store/apps/details?id=br.com.netcattest.catsuite.app) |
| CatBridge for Windows 64-bit | [catbridge-windows-amd64.zip](https://github.com/netcattest/catsuite/releases/download/tools-1.2.0/catbridge-windows-amd64.zip) |
| CatBridge for Linux 64-bit | [catbridge-linux-amd64.tar.gz](https://github.com/netcattest/catsuite/releases/download/tools-1.2.0/catbridge-linux-amd64.tar.gz) |
| Extension SDK 1.4.0 | [catsuite-sdk-1.4.0.zip](https://github.com/netcattest/catsuite/releases/download/sdk-1.4.0/catsuite-sdk-1.4.0.zip) |
| CatSuite Studio 1.2.0 (VS Code) | [Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=NetCatTest.catsuite-studio) or [catsuite-studio-1.2.0.vsix](https://github.com/netcattest/catsuite/releases/download/tools-1.2.0/catsuite-studio-1.2.0.vsix) |
| Extension IDE in the browser | [Web IDE](https://netcattest.com/catsuite/en/ide) |

## CatSuite app

CatSuite is an **Android** app. Download it from the official store:

- [Google Play — CatSuite](https://play.google.com/store/apps/details?id=br.com.netcattest.catsuite.app)

Every module — interceptor, browser, network proxy, Repeater, Intruder, Discoverer, Decoder, SSL/TLS Analyzer, extensions and workflows — ships inside the app. Data stays on the device. Start with [Getting started](https://netcattest.com/catsuite/en/docs/getting-started).

> [!NOTE]
> Current app version: **1.5.0**. Extension SDK: **1.4.0** · API v1. API v1 stays compatible across every SDK version.

## Official GitHub repository

The [github.com/netcattest/catsuite](https://github.com/netcattest/catsuite) repository brings together the source code and the downloads of the developer tools:

| Folder | What it contains |
|---|---|
| [catbridge](https://github.com/netcattest/catsuite/tree/main/catbridge) | The optional CatBridge connector, written in Go, with usage and pairing instructions. |
| [sdk](https://github.com/netcattest/catsuite/tree/main/sdk) | The 1.4.0 extension SDK: types, reference runtime, schemas, examples and workflow templates. |
| [catsuite-vscode](https://github.com/netcattest/catsuite/tree/main/catsuite-vscode) | The source code of the CatSuite Studio extension for VS Code. |

The ready-made files live in the repository's published releases, each one with its own SHA-256 checksum file:

| Release | Files | Verification |
|---|---|---|
| `sdk-1.4.0` | `catsuite-sdk-1.4.0.zip` | [SHA256SUMS.txt](https://github.com/netcattest/catsuite/releases/download/sdk-1.4.0/SHA256SUMS.txt) |
| `tools-1.2.0` | `catbridge-windows-amd64.zip`, `catbridge-linux-amd64.tar.gz`, `catsuite-studio-1.2.0.vsix` | [SHA256SUMS.txt](https://github.com/netcattest/catsuite/releases/download/tools-1.2.0/SHA256SUMS.txt) |

### Check the integrity

Compare the SHA-256 of each downloaded file with the value published in the `SHA256SUMS.txt` of the same release.

```powershell
Get-FileHash .\catsuite-sdk-1.4.0.zip -Algorithm SHA256
```

```bash
sha256sum -c --ignore-missing SHA256SUMS.txt
```

> [!WARNING]
> Download only from the official address `github.com/netcattest/catsuite` and install CatSuite Studio from the official Marketplace or from the VSIX published in the repository. If the hash does not match, delete the file and download it again.

## Extension SDK 1.4.0

The SDK brings together everything to build CatSuite plugins: the API types, the reference runtime, the schemas, **fifteen editable examples** and **six workflow templates**.

- [Download SDK 1.4.0 (ZIP)](https://github.com/netcattest/catsuite/releases/download/sdk-1.4.0/catsuite-sdk-1.4.0.zip)
- [Explore the sdk folder on GitHub](https://github.com/netcattest/catsuite/tree/main/sdk)
- [Full SDK guide](https://netcattest.com/catsuite/en/docs/extensions/sdk)

The ZIP extracts a `catsuite-sdk` folder. You do not need to install anything on the device to run extensions: the **QuickJS** engine runs inside the app and the global `cat` object is already available to your code. To write them, pick where you prefer to work:

- **In VS Code**, with [CatSuite Studio](https://netcattest.com/catsuite/en/docs/extensions/vscode): SDK suggestions, validation, a local preview and signed `.catplug` packages.
- **In the browser**, with the [extension IDE](https://netcattest.com/catsuite/en/ide): editor with highlighting, autocomplete, validation, a simulator and `.catplug` export, with nothing to install.
- **Read the contract** in the [JavaScript API reference](https://netcattest.com/catsuite/en/docs/extensions/api) and the [manifest and .catplug package](https://netcattest.com/catsuite/en/docs/extensions/manifest).

```ts
declare const cat: {
  readonly apiVersion: 1;
  readonly sdkVersion: "1.4.0";
  events: { on(name: "http.request" | "http.response" | "http.complete", handler: (message: CatMessage) => void | Promise<void>): void };
  proxy: { onRequest(handler: (m: CatMessage) => CatMessage | void): void; onResponse(handler: (m: CatMessage) => CatMessage | void): void };
  http: { send(request: CatRequest): Promise<CatMessage> };
  ui: { tab: { register(options: { id: string; title: CatText; components: CatComponent[] }): void } };
  findings: { add(finding: CatFinding): Promise<string> };
};
```

## CatSuite Studio for VS Code

**CatSuite Studio** is the official CatSuite extension for Visual Studio Code: SDK suggestions as you type `cat.`, ready-made templates, continuous validation, a local preview with fixtures and signed `.catplug` package builds.

- [Install from the Visual Studio Marketplace](https://marketplace.visualstudio.com/items?itemName=NetCatTest.catsuite-studio)
- [Download the 1.2.0 VSIX](https://github.com/netcattest/catsuite/releases/download/tools-1.2.0/catsuite-studio-1.2.0.vsix)
- [Source code on GitHub](https://github.com/netcattest/catsuite/tree/main/catsuite-vscode)

From the Marketplace, use the VS Code **Extensions** view and search for **CatSuite Studio**, or the command line:

```bash
code --install-extension NetCatTest.catsuite-studio
```

With the VSIX downloaded, open **Extensions → ⋯ → Install from VSIX** in VS Code and select the file, or use the command line:

```bash
code --install-extension catsuite-studio-1.2.0.vsix
```

CatSuite Studio requires **Visual Studio Code 1.100.0 or newer**. See the [full CatSuite Studio guide](https://netcattest.com/catsuite/en/docs/extensions/vscode).

## Extension IDE

The [web IDE](https://netcattest.com/catsuite/en/ide) runs entirely in the browser: nothing is sent to servers and the simulator makes no network connections. You create from scratch or from an example, validate, run it in a simulator faithful to the app and export a `.catplug` ready to import into CatSuite. See the [full IDE guide](https://netcattest.com/catsuite/en/docs/extensions/ide).

## CatBridge connector

[CatBridge](https://netcattest.com/catsuite/en/docs/catbridge) is **optional** and runs on **your** computer. The ready-made distribution does not require Go: download the package for your system, extract it and start the service. Pairing uses a **24-digit numeric code**, with no QR Code. The steps are in [Install and pair CatBridge](https://netcattest.com/catsuite/en/docs/catbridge/install), and the tool catalog in [Capabilities and tools](https://netcattest.com/catsuite/en/docs/catbridge/tools).

## Machine-readable documentation

Every page in this documentation has a **Markdown** version: append `.md` to its address. There is also a plain-text index for language models:

- [CatSuite llms.txt](https://netcattest.com/catsuite/llms.txt) — bilingual index of the app and the documentation.
- [llms-full.txt](https://netcattest.com/catsuite/llms-full.txt) — complete documentation in Portuguese and English in a single file.

## Next step

- [Extension SDK 1.4.0](https://netcattest.com/catsuite/en/docs/extensions/sdk)
- [CatSuite Studio for VS Code](https://netcattest.com/catsuite/en/docs/extensions/vscode)
- [Install and pair CatBridge](https://netcattest.com/catsuite/en/docs/catbridge/install)