Bruno API Client Review: The Offline-First Postman Alternative Tested

Postman’s 2023 decision to remove its Scratch Pad and push users toward cloud-synced workspaces didn’t just annoy developers—it triggered a quiet migration. Within weeks, alternatives like Insomnia, Hoppscotch, and Thunder Client saw spikes in interest. But one tool kept coming up in developer threads for a different reason: Bruno stores every request as a plain-text file on your own disk. No account. No cloud sync. No telemetry by default.

That’s a compelling pitch for anyone who has watched a team’s entire API collection get locked behind a login screen. I spent several weeks using Bruno across two projects—a REST API with JWT auth and a smaller GraphQL service—to see whether the offline-first approach holds up in daily work. Here’s what I found.

What Bruno Actually Is

Bruno is an open-source API client for exploring and testing APIs, built by a small team and distributed under the MIT license. Its defining architectural choice is that collections live as .bru files in a folder you choose—typically inside your Git repository. Each request, environment, and folder is a human-readable text file.

That single decision cascades into everything else:

• Git is the sync mechanism. You commit, branch, and review API changes the same way you do code. A pull request can include a new endpoint test alongside the code that implements it.
• No account required. You install the app and start working. There’s no sign-in wall between you and your requests.
• Data stays local. Nothing leaves your machine unless you explicitly configure it to.
• The format is inspectable. A .bru file looks like a small config script, not an opaque blob.

Bruno is available as a desktop app for macOS, Windows, and Linux, plus a CLI (bru) for running collections in CI pipelines. There’s also a VS Code extension for running requests inside the editor.

The .bru File Format, Up Close

The format is worth understanding because it’s the core of Bruno’s value proposition. A basic GET request looks roughly like this:

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

get {
  url: {{baseUrl}}/users/{{userId}}
  body: none
  auth: bearer
}

auth:bearer {
  token: {{apiToken}}
}

It’s readable, diffable, and merge-friendly. When two developers add different requests in different folders, Git handles it cleanly. When someone changes a header, the diff shows exactly that line—not a 400-line JSON reordering nightmare, which is a common complaint with exported Postman collections.

Environment variables live in their own files, which means you can commit a local.bru for shared defaults and keep secrets in an uncommitted file or inject them via the CLI at runtime. That’s a sensible separation, though it does require discipline to set up correctly.

Day-to-Day Testing Experience

The interface will feel familiar to anyone who has used Postman or Insomnia: a sidebar with your collection tree, a request builder in the center, and a response pane on the right. Tabs, folders, and drag-and-drop all work as expected.

What works well:

• Request chaining and scripting. Bruno supports pre-request and post-response scripts in JavaScript, with a bru object and req/res APIs. Extracting a token from a login response and reusing it in subsequent calls took only a few lines.
• Assertions. You can write tests inline and get pass/fail output in the response pane—useful for smoke-testing an endpoint without leaving the client.
• The CLI. bru run collection-folder --env production runs your collection headlessly, which makes it straightforward to wire into GitHub Actions or any CI system.
• Speed. Launching and switching between collections feels noticeably lighter than Postman, which has grown heavy over the years.

Where it shows its youth:

• Import fidelity. Importing a large Postman collection mostly worked, but scripts using Postman’s pm.* API needed manual conversion. Bruno has compatibility shims, but complex collections will require cleanup.
• GraphQL support is functional but less polished than REST. Schema introspection and autocomplete aren’t as mature as in dedicated GraphQL tools.
• Documentation and plugin ecosystem are thinner. You’ll rely on the docs site, GitHub issues, and community discussions more than you would with a decade-old incumbent.
• Collaboration features like shared team workspaces simply don’t exist in the cloud sense—by design. If your team wants a hosted dashboard of API runs, Bruno isn’t that tool.

Bruno vs. Postman: The Honest Comparison

The two tools are optimized for different things.

Dimension	Bruno	Postman
Storage	Local plain-text files	Cloud workspaces (with local options)
Account	Not required	Required for most collaboration
Git workflow	Native	Possible via export/import
Team collaboration	Via Git	Built-in, hosted
API documentation	Basic	Extensive, hosted
Mock servers & monitors	Limited	Mature
Pricing model	Free, open source	Free tier + paid plans

Postman remains the stronger choice if you need hosted documentation portals, mock servers, API monitoring, or non-technical stakeholders browsing collections in a browser. Bruno wins when your team already lives in Git and wants API definitions to travel with the code.

It’s not really a David-versus-Goliath story. It’s a question of whether your API collection is a document or a repository artifact.

Who Should Switch (and Who Shouldn’t)

Bruno fits well if you:

• Work on a team that reviews changes through pull requests
• Want API tests versioned alongside application code
• Care about keeping request data off third-party servers
• Run collections in CI and want the same files locally and in the pipeline
• Prefer tools that don’t require an account to function

Consider staying with Postman or looking elsewhere if you:

• Need hosted, shareable API documentation for external consumers
• Rely on mock servers, monitors, or scheduled test runs
• Have large collections deeply invested in pm.* scripts
• Want a polished GraphQL-first workflow
• Need non-developers to browse and execute requests without Git

The Takeaway

Bruno’s offline-first design isn’t a gimmick—it’s a coherent philosophy that reshapes how API work fits into a development workflow. Storing requests as text files in Git means your API collection gets the same review, history, and portability as the rest of your codebase, and the absence of a mandatory account removes a friction point that has quietly frustrated developers for years.

It’s also younger and less feature-complete than Postman, and that gap is real: import edge cases, a thinner GraphQL experience, and no hosted collaboration layer. For Git-centric engineering teams testing REST APIs, those trade-offs are often worth it. For teams that need hosted documentation, monitoring, and non-developer access, Postman still earns its place.

The most useful framing might be this: try Bruno on one project, commit your collection, and see how it feels to review an API change in a pull request. That workflow—not any single feature—is what Bruno is really selling.