Bruno vs Postman: A Lightweight Open-Source API Client Review for Offline-First Developers

Bruno vs Postman: A Lightweight Open-Source API Client Review for Offline-First Developers

Postman’s 2023 decision to remove the Scratch Pad—its offline-only workspace—set off a quiet migration. Developers who had relied on the tool for years suddenly found their collections pushed toward cloud sync, account sign-ins, and a workspace model built around collaboration rather than local files. The backlash was immediate and vocal. Into that gap stepped Bruno, an open-source API client that stores collections as plain files on your disk and treats the cloud as optional rather than default.

This review compares the two tools for developers who care about offline access, data ownership, and keeping their API workflow close to their codebase.

What Bruno Is and Why It Exists

Bruno launched on GitHub in 2022 as a direct response to a specific frustration: API collections locked inside proprietary formats and cloud accounts. Its core design principle is simple—every request, environment, and collection lives as a .bru file in a folder on your machine. You can open that folder in any text editor, commit it to Git, or diff it in a pull request.

The tool is built with Electron, so it runs on Windows, macOS, and Linux. It’s licensed under MIT, and the company behind it (also called Bruno) offers a paid API for team collaboration, but the desktop client itself is fully functional without an account. That distinction matters: you can use Bruno indefinitely without ever creating a login.

Where Postman Still Leads

Before diving into Bruno’s strengths, it’s worth being fair to Postman. The tool remains the most feature-complete API client on the market.

• Protocol coverage: Postman supports REST, GraphQL, gRPC, WebSocket, and SOAP in a single interface. Bruno’s gRPC and WebSocket support has improved but remains less mature.
• Mock servers: Postman can spin up hosted mock endpoints from a collection, useful for frontend teams waiting on backend work.
• Monitoring: Scheduled collection runs with alerting are built in.
• Ecosystem: Integrations with CI providers, API gateways, and documentation generators are extensive.
• Team features: Role-based access, comments, and version history are polished.

If your team depends on any of these, Postman is still the safer choice. The question is whether you actually need them.

The Offline-First Difference

The core philosophical split is where your data lives.

Postman stores collections in its cloud by default. The Scratch Pad allowed local-only work, but Postman removed it in 2023 and later reintroduced a limited version after user pushback. Even today, the offline experience is a secondary mode—you’re working around the cloud, not in it.

Bruno stores everything locally. There is no “sync” toggle to enable. Your collection is a folder. If you want to share it, you commit it to Git or send a zip. If you want to back it up, you copy the folder. If Bruno the company disappeared tomorrow, your files would still open in a text editor.

For developers working on air-gapped systems, in regulated environments, or simply on flaky hotel Wi-Fi, this is not a minor convenience—it’s the entire point.

File Formats: .bru vs JSON

Bruno’s .bru format is human-readable and diff-friendly. A simple GET request looks roughly like this:

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

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

Postman collections are JSON, which is also diffable but far more verbose—a single request can span 50+ lines once you include headers, scripts, and metadata. In practice, Bruno pull requests are easier to review because the signal-to-noise ratio is higher.

Bruno also supports importing Postman collections, OpenAPI specs, and Insomnia exports, so migration isn’t a rewrite.

Scripting and Testing

Both tools support pre-request and post-response scripts in JavaScript. Bruno uses a similar API surface (bru.getEnvVar(), res.getBody(), etc.) that will feel familiar to anyone coming from Postman’s pm.* syntax.

Bruno’s CLI (bru) runs collections headlessly, which makes it usable in CI pipelines. It’s less feature-rich than Newman, Postman’s CLI runner, but for straightforward test suites it works well. If your CI relies on complex reporters or Postman-specific features, expect some rework.

Performance and Resource Use

Both are Electron apps, so neither is lightweight in the way a native binary would be. That said, Bruno generally feels snappier on startup and uses less memory in typical use, largely because it isn’t loading a cloud sync layer and a large web app shell. On an older laptop, the difference is noticeable but not dramatic—expect a few hundred megabytes of RAM either way.

Pricing

Postman’s free tier is generous for individuals but caps collaboration. Paid plans start around $14 per user per month (billed annually) for the Basic tier and climb quickly for team features.

Bruno’s desktop client is free and open source. The paid team plan, which adds cloud sync and collaboration, is priced lower than Postman’s equivalent tiers, though exact pricing has shifted since launch—check the current site before budgeting.

Who Should Switch

Bruno makes sense if you:

• Want your API collections in version control alongside your code
• Work in environments where cloud sync is restricted or unreliable
• Prefer plain-text files over proprietary formats
• Don’t need mock servers, monitoring, or extensive integrations
• Are comfortable with a smaller ecosystem and occasional rough edges

Postman remains the better fit if you:

• Rely on team collaboration features like comments and shared workspaces
• Need broad protocol support, especially mature gRPC tooling
• Use Postman’s monitoring or mock server features in production workflows
• Want the largest library of tutorials, plugins, and community answers

The Honest Tradeoffs

Bruno is younger. Its documentation, while improving, is thinner than Postman’s. Some features—particularly around authentication flows and GraphQL schema introspection—are less polished. The community is smaller, so obscure problems take longer to solve.

But for a specific and growing audience—developers who treat API collections as code, not as SaaS data—Bruno solves a problem Postman created. That’s a meaningful niche, and Bruno fills it well.

The Takeaway

If you’ve ever felt uneasy about your API collections living in someone else’s cloud, Bruno is worth an afternoon of testing. Import a Postman collection, poke around the .bru files, and commit them to a repo. The workflow either clicks immediately or it doesn’t. For offline-first developers, it usually does—and the fact that your data stays yours is a feature Postman can’t easily copy without dismantling its own business model.