Bruno vs Postman: A Lightweight Open Source API Client Review
If you have spent any time testing APIs, you have probably opened Postman. It has been the default choice for years, and with good reason: it is polished, widely supported, and packed with features. But a growing number of developers are looking for something leaner, and Bruno has emerged as one of the most interesting alternatives. This review compares the two tools on the things that actually matter day to day: storage model, collaboration, performance, and pricing.
What Is Bruno?
Bruno is an open source API client built around a simple idea: your API collections should live in plain text files inside your project repository, not in a proprietary cloud database. Each request is saved as a .bru file, and collections are organized in folders you can commit to Git just like any other source code.
The project is developed by a small team and distributed as a desktop application for macOS, Windows, and Linux. The core client is free and open source, with a paid tier aimed at teams that want shared workspaces and CI integration.
What Is Postman?
Postman started in 2012 as a Chrome extension and grew into a full API platform. Today it covers request building, automated testing, mock servers, documentation hosting, API monitoring, and a cloud workspace where teams can collaborate in real time. Collections sync to Postman’s servers by default, and the free tier has limits on collaboration features and history.
The Core Difference: Where Your Collections Live
This is the dividing line between the two tools, and it shapes everything else.
In Postman, collections live in the cloud. That makes sharing easy, but it also means your API definitions sit on someone else’s infrastructure. Exporting works, but the sync model assumes a Postman account.
In Bruno, collections live on disk. You can open a folder, edit a request, and commit the change with a normal Git workflow. Pull requests can include API changes alongside the code that consumes them. Merge conflicts are ugly, but at least they are visible and resolvable with tools you already use.
For teams that treat API definitions as part of the codebase, this is a meaningful shift. It also means no account is required to use the core app, and no network connection is needed to work with your collections.
Feature Comparison
| Feature | Bruno | Postman |
|---|---|---|
| Storage model | Local plain-text files | Cloud-synced database |
| Git-friendly | Yes, native | Partial (export/import) |
| Free collaboration | Via Git | Limited on free tier |
| Scripting | JavaScript (pre-request, tests) | JavaScript (pre-request, tests) |
| Environments | Yes, file-based | Yes, cloud-synced |
| CLI for CI | Yes (Bruno CLI) | Yes (Newman) |
| Mock servers | No | Yes |
| API documentation hosting | No | Yes |
| Open source | Yes (core app) | No |
Both tools support environment variables, pre-request scripts, and test assertions in JavaScript, so for basic request-and-assert workflows the two feel similar. The gaps appear around the edges: Postman offers mock servers, hosted documentation, and monitoring that Bruno simply does not have.
Performance and Resource Use
Postman is an Electron app, and it behaves like one. On a laptop with a few collections open, it commonly sits in the hundreds of megabytes of RAM. That is not unusual for Electron, but it is noticeable when you keep the app running all day.
Bruno is also built on Electron, so the difference is not architectural. In practice, though, Bruno tends to feel lighter because it does less. There is no background sync, no workspace telemetry, and no embedded documentation browser. Startup is fast, and the interface stays responsive with large collections. If your main complaint about Postman is that it feels heavy, Bruno addresses the symptom even if it shares the same underlying stack.
Collaboration: Two Different Philosophies
Postman’s collaboration story is real-time and centralized. A teammate updates a collection, and you see it immediately. Comments, version history, and shared workspaces are built in. For large organizations with mixed technical backgrounds, this is genuinely useful.
Bruno’s collaboration story is Git. You share collections the same way you share code: through a repository, with branches and pull requests. This works beautifully for engineering teams already living in Git. It works less well if your QA team, product managers, or external partners need to poke at an API without cloning a repo.
There is no objectively better answer here. It depends on who needs access and how your team already works.
Pricing
Postman’s free tier is generous for individuals, but team features and higher usage limits push you toward paid plans, which are billed per user per month. Costs add up quickly at scale.
Bruno’s core app is free and open source under the MIT license. The paid team plan adds shared workspaces and collaboration features, but you can run the free version indefinitely without an account. For solo developers and small teams, the cost difference is straightforward.
Scripting and Testing
Both tools let you write JavaScript that runs before a request and assertions that run after. Bruno’s API is close enough to Postman’s that porting simple scripts is mostly a matter of adjusting a few method names. Bruno also ships a CLI that can run collections in CI pipelines, similar to how Newman runs Postman collections.
The trade-off is ecosystem maturity. Postman has years of documentation, community examples, and third-party integrations. Bruno’s documentation is solid but younger, and you will occasionally hit an edge case where you have to read the source or ask in the community Discord.
Who Should Use Which
Choose Bruno if:
- You want API collections versioned alongside your code
- You prefer local files over cloud sync
- You value a small, open source tool over a large platform
- Your team already collaborates through Git
Stick with Postman if:
- You need mock servers, hosted docs, or monitoring
- Non-developers need to browse and test APIs
- You rely on real-time cloud collaboration
- You want the largest ecosystem and community
The Bottom Line
Bruno is not trying to beat Postman at everything, and that is precisely its strength. By betting on plain-text files and Git, it offers a workflow that feels natural to developers who already treat configuration as code. Postman remains the more capable platform overall, especially for teams that need collaboration features beyond what a repository provides.
The honest answer is that many developers can use both. Keep Postman around for the platform features, and reach for Bruno when you want a fast, local, Git-friendly client that does not ask you to sign in. If your API work already lives in a repo, Bruno is worth a serious look.