Postman vs Insomnia vs Bruno: API Client Comparison for Developer Teams

Postman vs Insomnia vs Bruno: API Client Comparison for Developer Teams

Three tools, three philosophies. Postman is the incumbent platform with 35 million+ registered developers. Insomnia is the design-first challenger now owned by Kong. Bruno is the upstart that stores collections as plain files on your disk and has no cloud account at all.

For individual developers, the choice often comes down to taste. For teams, it comes down to harder questions: Where does your API collection live? Who can read it? What happens when the vendor changes its pricing or its roadmap? Here’s how the three compare on the things that actually matter to teams.

The Contenders at a Glance

Postman launched in 2012 as a Chrome extension and grew into a full API platform: collections, environments, mock servers, automated tests, monitors, and documentation. It’s the default choice at most companies, largely because everyone already knows it.

Insomnia started in 2016 as a lean, good-looking REST and GraphQL client. Kong acquired it in 2019 and has since pushed it toward API design and spec-driven workflows, including OpenAPI editing and a design-first approach. A free tier exists; team collaboration features sit behind paid plans.

Bruno appeared in 2022 as a reaction to cloud-first tools. Collections are stored as .bru files in a folder you choose, typically committed to Git alongside your code. There’s an optional paid team tier, but the core product works entirely offline with no account.

Where Your Collections Live

This is the single biggest practical difference between the three.

Postman stores collections in its cloud by default. You can export them as JSON, but day-to-day work happens in Postman’s workspace, and collaboration means inviting people into that workspace. Free plans limit collaboration; paid plans start at $14 per user per month (billed annually) and rise from there.

Insomnia historically stored data locally, but the current version syncs to Insomnia’s cloud and requires an account for most workflows. Kong has been steadily aligning it with the broader Kong ecosystem, which makes sense commercially but changes the calculus for teams that picked Insomnia partly for its local-first feel.

Bruno inverts the model entirely. A collection is a directory of plain-text files. You commit it to Git, review changes in pull requests, and branch it like any other code. There’s no sync conflict to resolve because Git is the sync mechanism. For teams already living in Git, this removes an entire category of friction.

The tradeoff: Bruno’s Git-based model assumes your team is comfortable with version control. If your QA engineers or product managers don’t use Git, Postman’s shared workspaces will feel more accessible.

Collaboration and Review Workflows

Postman’s collaboration story is mature. Shared workspaces, roles and permissions, comments on requests, and a web-based collection viewer mean non-developers can inspect and even run requests without installing anything. For large organizations with mixed technical audiences, that’s a real advantage.

Insomnia offers team collaboration through paid plans, with shared projects and environments. It’s functional but less expansive than Postman’s ecosystem, and it’s more clearly aimed at API designers and developers than at cross-functional teams.

Bruno’s collaboration is Git. That means code review, blame, and branching come for free, but real-time co-editing doesn’t exist and isn’t planned in the same way. If two people edit the same request file, you resolve it like a merge conflict. Some teams love this. Others find it tedious.

One underrated point: because Bruno files are human-readable, diffs are actually legible. Reviewing a change to an API request in a pull request is straightforward in a way that reviewing an exported Postman JSON blob often isn’t.

Scripting, Testing, and Automation

Postman uses JavaScript for pre-request and test scripts, with a large library of built-in assertions and the pm.* API. It also offers the Postman CLI (formerly Newman) for running collections in CI, plus cloud-based monitors that run collections on a schedule. If you want scheduled API monitoring without building anything, Postman is the only one of the three that does it natively.

Insomnia supports scripting too, and its plugin ecosystem lets you extend behavior. It can run collections via its CLI, and its OpenAPI tooling is genuinely strong if your team designs specs before writing code. For spec-first workflows, Insomnia’s editor is arguably the best of the three.

Bruno supports JavaScript-based pre-request and test scripts, and it ships a CLI (bru) for CI pipelines. It also handles a useful range of formats: import from Postman, Insomnia, OpenAPI, and others, plus the ability to run collections directly from the command line. What it lacks is hosted monitoring and the deep platform integrations Postman has accumulated over a decade.

If your CI pipeline is the center of your testing strategy, all three can work. If you want a dashboard showing API health over time without wiring anything up, Postman has the shortest path.

Pricing and Lock-In

Postman’s free tier is generous for individuals. Paid plans begin around $14 per user per month for the Basic tier, with higher tiers for advanced governance and API catalog features. Enterprise pricing is custom.

Insomnia has a free tier for individual use and paid plans for teams, with pricing that has shifted since the Kong acquisition. It’s worth checking current terms rather than relying on older comparisons.

Bruno is free and open source for individual and small-team use, with an optional paid tier for larger teams that want hosted features. Because everything is file-based, the exit cost is effectively zero: your collections are already on your machine in a readable format.

That last point deserves emphasis. Vendor lock-in in API tooling is real but rarely discussed. Migrating hundreds of Postman collections to another tool is a project. Migrating Bruno collections is a git clone.

Which Should Your Team Pick?

There’s no universal answer, but the decision usually maps to a few patterns.

Choose Postman if you need broad organizational adoption, non-developers editing requests, scheduled monitoring, and a mature ecosystem. It’s the safe default, and for many teams “safe default” is the correct answer.

Choose Insomnia if your team is design-first, works heavily with OpenAPI specs, and wants a cleaner interface than Postman’s increasingly busy UI. It’s a strong fit for smaller API-focused teams.

Choose Bruno if you want collections versioned with your code, you value offline-first operation, and your team is comfortable with Git-based workflows. It’s also a natural fit for teams that have been burned by pricing changes or cloud dependencies.

Some teams run more than one. Postman for org-wide visibility, Bruno for day-to-day development, is a combination that shows up in practice more often than you’d expect.

The Takeaway

The API client market has quietly split along a single axis: cloud platform versus local files. Postman and Insomnia are betting that teams want a hosted, collaborative platform with a vendor managing the infrastructure. Bruno is betting that teams want their API definitions to live next to their code, under their own version control.

Neither bet is wrong. But the question worth asking before you pick is simple: in five years, where do you want your API collections to live, and who do you want controlling access to them? Answer that honestly, and the tool choice tends to make itself.