Bruno
Git-native API client for exploring and testing REST, GraphQL, and gRPC endpoints with local collections that stay in your filesystem instead of a hosted workspace.
40K GitHub stars, 600K monthly users
Last updated
Recommended Fit
Best Use Case
Developers who want a fast, Git-friendly, open-source API client as an alternative to Postman.
Bruno Key Features
Multi-protocol Support
Test REST, GraphQL, gRPC, and WebSocket APIs from one interface.
API Client & Testing
Environment Variables
Manage different API environments with variable substitution.
Collection Organization
Organize requests into collections with folders and documentation.
Automated Testing
Write and run API tests with assertions and CI/CD integration.
Bruno Top Functions
Overview
Bruno is a lightweight, open-source API client designed for developers who prioritize speed, version control integration, and local-first workflows. Unlike cloud-hosted alternatives, Bruno stores all API collections, requests, and configurations directly in your filesystem as plain-text files, making them naturally compatible with Git and eliminating vendor lock-in. It supports REST, GraphQL, and gRPC protocols, offering a genuinely free experience without tiered limitations or cloud dependencies.
The tool eliminates friction between API testing and code collaboration by treating collections as first-class Git artifacts. Developers can commit request definitions, environment variables, and test scripts alongside their codebase, enabling seamless team synchronization and change tracking. This approach transforms API testing from an isolated workflow into an integrated part of your development pipeline.
Key Strengths
Bruno excels in environment management through built-in variable substitution, dynamic scripting via JavaScript, and request chaining capabilities. The interface supports granular control over headers, authentication (OAuth 2.0, API keys, Bearer tokens), query parameters, and request bodies with syntax highlighting. Collections are fully customizable with folders, tags, and hierarchical organization that scales from simple exploratory testing to complex multi-endpoint workflows.
Testing automation is a standout feature—Bruno allows you to attach pre-request and post-response scripts to individual requests or entire collections, enabling assertion-based validation, conditional workflows, and automated regression testing without external test frameworks. The local-first architecture means zero network latency for collection access, instant search across thousands of requests, and complete offline functionality once collections are cached.
- Multi-protocol support: REST, GraphQL introspection, and gRPC streaming without protocol-specific plugins
- JavaScript-based scripting for dynamic request generation, response parsing, and test assertions
- Environment variable inheritance with support for global, workspace, and request-level scoping
- Git-native storage: collections are human-readable TOML/JSON files tracked by version control
Who It's For
Bruno is ideal for developers and teams who want API testing integrated into their Git workflow without Postman's cloud dependency or pricing complexity. Open-source contributors, DevOps engineers, and backend developers building microservices benefit most from the filesystem-first approach and scriptable automation. Teams maintaining strict data residency requirements or working offline frequently will appreciate the local-only architecture.
Small to mid-sized engineering organizations can standardize on Bruno for API testing across projects while maintaining version control parity with their codebase. Individual developers prototyping APIs, integrating third-party services, or documenting REST endpoints gain a frictionless tool that doesn't require account creation, subscriptions, or cloud sync delays.
Bottom Line
Bruno successfully challenges the Postman monopoly by delivering a genuinely free, git-integrated API client without sacrificing core testing functionality. The filesystem-based architecture is philosophically aligned with modern development practices where infrastructure-as-code and API-as-code eliminate manual configuration overhead. For developers prioritizing simplicity, version control, and offline capability, Bruno is a compelling choice.
Bruno Pros
- Completely free and open-source with no paid tiers, usage limits, or hidden costs—all features available to everyone.
- All collections stored locally as plain-text files natively compatible with Git, enabling seamless version control and code review workflows.
- Offline-first operation means zero dependency on cloud infrastructure, instant search across thousands of requests, and full functionality without internet.
- Built-in JavaScript scripting for dynamic request generation, conditional logic, and assertion-based testing without external test frameworks or plugins.
- Multi-protocol support for REST, GraphQL with introspection, and gRPC streaming in a single unified interface.
- Environment variable management with hierarchical scoping (global, environment, request-level) reduces configuration duplication and secrets exposure.
- Cross-platform native application (macOS, Windows, Linux) with consistent UI and no browser overhead compared to web-based alternatives.
Bruno Cons
- Team collaboration workflows require manual Git management—no built-in workspace sharing or conflict resolution for simultaneous edits like Postman offers.
- Lacks mock server functionality and API documentation generation features that Postman provides natively.
- Limited integration ecosystem compared to Postman; no direct connectors for popular CI/CD platforms, monitoring tools, or API lifecycle management suites.
- Desktop-only application without web or mobile interface, limiting remote testing and on-the-go API exploration compared to cloud-based clients.
- GraphQL support is read-only (introspection and query execution) without mutation testing or subscription streaming features.
- No built-in analytics, usage metrics, or API performance monitoring—purely a testing client without observability features.
Get Latest Updates about Bruno
Tools, features, and AI dev insights - straight to your inbox.
Bruno Social Links
GitHub discussions for Bruno API client community
