API Development · Updated 2026
Quick Verdict
Choose Bruno if you need a standalone, offline-first API client with Git-native version control for your collections. Choose Thunder Client if you live in VS Code and want a fast, integrated API testing tool without leaving your IDE.
Bruno and Thunder Client are both free API clients with fundamentally different architectures. Bruno is a standalone, offline-first desktop application that stores collections as plain text files in a folder, making them inherently versionable with Git. Thunder Client is a lightweight extension that runs directly inside Visual Studio Code, prioritizing tight IDE integration and convenience. Their core difference lies in Bruno's focus on privacy, portability, and file-based collaboration versus Thunder Client's focus on developer workflow efficiency within a single environment.
Side-by-Side Comparison
| Aspect | Bruno | Thunder Client |
|---|---|---|
| Pricing | Free | Free |
| Ease of Use | Intuitive GUI, but requires managing files/folders. | Extremely low-friction; launches directly in VS Code. |
| Scalability | High; file-based collections scale with your Git and file system practices. | Moderate; best for individual or small-team use within VS Code. |
| Integrations | Git (native), Filesystem. | Visual Studio Code (deep integration). |
| Open Source | Yes | No |
| Best For | Offline-first, Git-native workflows and team collaboration. | VS Code users seeking integrated, convenient API testing. |
Choose Bruno if...
Bruno is the superior choice for teams that prioritize data privacy, require offline access, and want to manage and version-control their API collections directly through their Git repository. It is also ideal for developers who work across multiple IDEs or prefer a dedicated, portable application not tied to a specific editor.
Choose Thunder Client if...
Thunder Client is the better choice for developers who spend most of their time in Visual Studio Code and want to test APIs quickly without switching windows or applications. Its seamless integration into the VS Code sidebar and workflow makes it exceptionally convenient for quick debugging and exploratory testing during development.
Product Details
Bruno
A fast, offline-first API client that stores collections directly in a filesystem or Git repository.
Pricing
Free
Best For
Developers and teams who prioritize privacy, want to version-control their API collections with Git, and prefer an offline-first tool.
Key Features
Pros
- + Completely free and open-source with no paid plans
- + Superior collection portability and collaboration via Git
- + No data privacy concerns as all data stays on your machine
Cons
- - Lacks cloud-based features like shared team workspaces
- - Smaller ecosystem and fewer integrations than established rivals
- - Relatively new, so community support and documentation are growing
Thunder Client
A lightweight, GUI-based REST API client extension for Visual Studio Code.
Pricing
Free
Best For
Developers who primarily work in Visual Studio Code and want a fast, integrated tool for testing APIs without context-switching to external applications.
Key Features
Pros
- + Extremely fast and lightweight with minimal setup
- + Seamlessly integrated into VS Code workflow
- + Completely free with no account required for core features
Cons
- - Limited advanced features compared to full-scale API platforms
- - Tied exclusively to Visual Studio Code
- - Less sophisticated collaboration and documentation tools