Bruno API Client Review: The Offline-First Postman Alternative Worth Switching To?

Bruno API Client Review: The Offline-First Postman Alternative Worth Switching To?

In 2023, Postman’s desktop app quietly began requiring users to sign in to a cloud account just to send a local HTTP request. For developers working on air-gapped machines, in regulated industries, or simply annoyed by yet another mandatory login, that change landed badly. Around the same time, a small open-source project called Bruno started gaining traction on GitHub with a simple pitch: your API collections are just files on your disk, and the app works entirely offline by default.

Bruno crossed 30,000 GitHub stars in 2025 and has built a following among developers who want Git-friendly, local-first API testing. But is it actually good enough to replace Postman or Insomnia in day-to-day work? 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 sending HTTP requests, organizing them into collections, and running assertions on responses. It runs on macOS, Windows, and Linux. The core app is free and open source under the MIT license, with a paid “Golden Edition” that adds features like built-in OAuth2 helpers, a visual Git UI, and priority support.

The defining design decision is this: a Bruno collection is a folder on your filesystem. Each request is a plain-text .bru file. There’s no proprietary cloud database, no account requirement, and no sync service sitting between you and your requests. If you want to share a collection with your team, you commit it to Git.

That one architectural choice cascades into almost everything that makes Bruno appealing.

The Offline-First Architecture, Explained

Open a Bruno collection folder and you’ll see something like this:

my-api/
├── bruno.json
├── environments/
│   └── Local.bru
├── Users/
│   ├── Get User.bru
│   └── Create User.bru
└── Auth/
    └── Login.bru

Each .bru file contains the request method, URL, headers, body, and any test scripts, in a readable format. Because these are text files, they diff cleanly in pull requests. A teammate can review a new API test the same way they’d review a code change. When an endpoint changes, you see exactly which request files were touched.

This is a meaningful improvement over Postman’s export format, which historically produced large JSON blobs that were painful to review. Postman has since added Git integration and a “local view” mode, but the file-based model is still Bruno’s native mode rather than an add-on.

Performance and Day-to-Day Use

Bruno feels fast. The app is built on Electron, so it’s not lightweight in the way a native Rust or Go app would be, but it launches quickly and stays responsive. Collections with hundreds of requests load without the sluggishness some users report in Postman as workspaces grow.

The request builder covers the essentials: all HTTP methods, query params, headers, multiple body types (JSON, form data, multipart, GraphQL), and file uploads. Authentication helpers include Bearer tokens, Basic auth, API keys, and OAuth2 in the Golden Edition. Environment variables work as you’d expect, with separate environment files you can commit or gitignore depending on whether they contain secrets.

Scripting uses JavaScript. You write pre-request and post-response scripts with a bru object that exposes the request, response, environment variables, and test assertions. If you’ve written Postman scripts before, the concepts transfer directly even though the API surface differs.

Here’s a typical test script in Bruno:

test("status is 200", function() {
  expect(res.getStatus()).to.equal(200);
});

test("returns a user object", function() {
  const body = res.getBody();
  expect(body).to.have.property("id");
});

The assertion syntax uses Chai, which will be familiar to many JavaScript developers.

Where Bruno Falls Short

Bruno is younger than Postman, and it shows in a few areas.

Collaboration without Git is awkward. If your team doesn’t use Git, or includes non-engineers like QA analysts or product managers, Bruno’s model is less convenient than Postman’s shared cloud workspaces. There’s no real-time collaborative editing, no comment threads on requests, and no built-in sharing links.

The ecosystem is thinner. Postman has thousands of public API collections, a mock server, monitoring, and a CLI that integrates with CI systems. Bruno has a CLI (bru) that runs collections in CI, which covers the most important use case, but the surrounding tooling is smaller.

Some enterprise features are missing or paid. SSO, audit logs, and team management live in the paid tier. Regulated teams that need these should factor in the cost.

Importing is good but not perfect. Bruno imports Postman collections, OpenAPI specs, Insomnia exports, and others. Complex Postman scripts sometimes need manual fixing after import, particularly around dynamic variables and pre-request logic.

Bruno vs. Postman vs. Insomnia

The short version: Postman remains the strongest choice for teams that want cloud collaboration and a broad ecosystem. Bruno wins for individual developers and engineering teams that live in Git and value local control. Insomnia sits somewhere in between, though its ownership changes over the years have made some users cautious.

Who Should Switch

Bruno is a strong fit if you:

• Work with sensitive APIs and can’t send request data to third-party clouds
• Want API collections versioned alongside the code they test
• Are tired of mandatory accounts and telemetry
• Run API tests in CI and want a simple CLI story

It’s a weaker fit if you:

• Need real-time collaboration with non-technical teammates
• Rely heavily on Postman’s mock servers, monitors, or public API network
• Want a mature plugin ecosystem

The Verdict

Bruno gets the fundamentals right. The file-based, offline-first design isn’t a gimmick—it solves real problems around version control, privacy, and vendor lock-in that have frustrated API developers for years. The app is fast, the scripting is capable, and the free tier is genuinely usable.

It’s not a drop-in replacement for every Postman workflow, particularly in large organizations where cloud collaboration matters. But for developers who treat API collections as code, Bruno is the most compelling alternative to emerge in years. If your team already uses Git for everything else, the switch is worth a serious look.