Bruno API Client Review: The Git-Friendly Open Source Postman Alternative

Bruno API Client Review: The Git-Friendly Open Source Postman Alternative

API work has a version-control problem. For years, the default answer has been to build requests in a GUI tool like Postman, watch them pile up in a proprietary cloud workspace, and hope the export button produces something a teammate can actually use. Meanwhile, the rest of the codebase lives in Git, where every change is reviewable, diffable, and reversible.

Bruno takes a different approach. Instead of storing your API collections in a cloud database, it saves them as plain text files on your filesystem—files you can commit, branch, and review like any other source code. That single design decision is why the tool has built a following among developers who care about where their work lives.

This review covers what Bruno does well, where it falls short, and who should consider switching.

What Bruno Actually Is

Bruno is a desktop API client for exploring and testing HTTP APIs. It runs on macOS, Windows, and Linux, and it’s open source under the MIT license. You can download the free version, or pay for a “Golden Edition” that adds features like built-in support for external secret managers and a few team-oriented capabilities.

The core workflow will feel familiar to anyone who has used Postman or Insomnia. You create requests, set methods and URLs, add headers and query parameters, write test scripts, and inspect responses. Bruno supports REST, GraphQL, and gRPC, plus WebSocket testing. It handles environment variables, authentication helpers for OAuth 2.0, AWS Sig v4, and other schemes, and it can generate code snippets in a long list of languages.

What sets it apart is the storage layer. Every collection is a folder. Every request is a .bru file—a lightweight, human-readable format that looks roughly like this:

meta {
  name: Get Users
  type: http
  seq: 1
}

get {
  url: https://api.example.com/users
  body: none
  auth: none
}

No JSON blobs, no UUIDs scattered across a database, no merge conflicts that require a GUI to resolve. You open the file in your editor, change the URL, and commit.

The Git Workflow Is the Whole Point

The pitch sounds simple, but the practical difference is significant.

In a cloud-based client, collaboration usually means inviting teammates into a shared workspace, where changes happen live and the history is whatever the vendor decides to keep. Reviewing a proposed API change means opening the tool and clicking around. In Bruno, reviewing a change means opening a pull request.

That has real consequences:

• Code review extends to API definitions. A teammate can comment on a specific line of a request file, the same way they’d review a function.
• Branches work as expected. You can maintain a feature/new-endpoint branch with its own set of requests and merge it when the endpoint ships.
• CI can use the same files. Bruno ships a CLI (bru) that runs collections headlessly. You can wire it into GitHub Actions or any CI system, so the requests your team tests manually are the same ones that run on every commit.
• No vendor lock-in on your data. If Bruno disappears tomorrow, your collections are still folders of text files. You can read them, script against them, or migrate them.

For teams that already live in Git, this removes an entire category of friction. The API collection stops being a separate artifact that drifts out of sync with the code and becomes part of the repository.

Where Bruno Falls Short

No tool is free of tradeoffs, and Bruno’s architecture creates a few.

Collaboration is DIY. Because collections live in Git, sharing them requires a Git remote. That’s fine for engineering teams, but it’s a hurdle for organizations where non-developers need to poke at APIs. There’s no equivalent of a hosted workspace where a product manager can open a link and see the latest requests without cloning a repo.

The ecosystem is younger. Postman has years of head start on integrations, public API networks, mock servers, and documentation generation. Bruno covers the essentials, but if your workflow depends on a specific Postman feature—like its API network or advanced mocking—you may find gaps.

Scripting is JavaScript, and it’s sandboxed. Bruno uses a JavaScript-based scripting layer for pre-request and post-response logic, similar in spirit to Postman’s. It’s capable, but the API surface is smaller, and some patterns that work in Postman require rework.

Performance on very large collections. Collections with thousands of requests can feel slower to navigate than a database-backed tool, since Bruno is reading from disk. In practice, most teams won’t hit this, but it’s worth knowing.

How It Compares to Postman and Insomnia

Postman remains the most feature-complete option. Its cloud workspace, team management, mock servers, and documentation tools are genuinely useful, and its free tier is generous. The tradeoff is that your collections live in Postman’s cloud, and the free tier has grown more restrictive over time—features like the CLI and certain collaboration tools sit behind paid plans.

Insomnia sits somewhere in between. It’s a capable client with a cleaner interface than Postman, and it offers a Git sync option, but its storage model is less transparent than Bruno’s plain-file approach, and its ownership has changed hands in ways that made some users nervous about long-term direction.

Bruno’s bet is that a meaningful number of developers would rather own their data and use the tools they already trust—Git, their editor, their CI—than get a polished all-in-one platform. For that audience, the tradeoff is worth it.

Who Should Use Bruno

Bruno makes the most sense if:

• Your team already uses Git for everything else and wants API collections to live alongside the code
• You want to run API tests in CI without paying for a separate plan
• You’re uncomfortable with your API definitions sitting in a vendor’s cloud
• You value being able to read and edit request files in a plain text editor

It’s less compelling if you need a shared, non-developer-friendly workspace, depend heavily on Postman-specific features, or want a fully managed platform with support contracts.

The Bottom Line

Bruno isn’t trying to out-feature Postman. It’s trying to solve a narrower, more specific problem: making API collections behave like code. For teams that feel the pain of API definitions drifting away from their repositories, that’s a compelling pitch, and the execution is solid enough to switch for. For everyone else, Postman and Insomnia remain perfectly reasonable choices.

The honest framing is this: if the phrase “commit your API collection” sounds obviously correct to you, Bruno will feel like it was built for you. If it sounds like extra work, it probably is—and you should stay where you are.