Postman vs Insomnia vs Bruno: Which API Client Is Best for Your Team in 2025

Three tools dominate the conversation whenever a team sits down to pick an API client. Postman, the long-standing default with millions of users. Insomnia, the design-first challenger that Kong acquired in 2019. And Bruno, the open-source upstart that stores collections as plain files on your disk and has quietly built a devoted following since launching in 2022.

The choice matters more than it used to. API clients now sit at the center of how teams document endpoints, run automated tests, share environments, and collaborate across time zones. Pick the wrong one and you’re either paying per seat for features nobody uses or fighting a tool that doesn’t fit your workflow.

Here’s how the three compare on the things that actually affect day-to-day work.

Postman: The Everything Platform

Postman started in 2012 as a Chrome extension and grew into something closer to a full API lifecycle platform. It handles request building, automated testing, mock servers, documentation, monitoring, and API governance. If your organization needs a single place where backend engineers, QA, and product managers all look at the same API definitions, Postman is built for that.

The strengths are real. The collection runner is mature. Newman, Postman’s CLI companion, lets you run collections in CI pipelines without much setup. Documentation generation is largely automatic. The public API Network gives you a way to discover and fork collections from other teams.

The friction shows up in two places. First, pricing. Postman’s free tier is generous for individuals, but team collaboration features—shared workspaces, role-based access, version history—push you into paid plans that are billed per user. For a 20-person engineering org, that’s a meaningful line item, and it scales with headcount rather than usage.

Second, the cloud-first architecture. Collections live in Postman’s cloud by default. That’s convenient for distributed teams and awkward for anyone working under strict data residency rules, air-gapped environments, or simply a preference for keeping API definitions in version control alongside the code they describe. Postman added local and Git-based options over time, but the product’s center of gravity remains its hosted platform.

Insomnia: Polished Design, Mixed Signals

Insomnia built its reputation on a cleaner interface and stronger support for GraphQL and gRPC than early Postman offered. The design-first workflow—define your spec, generate requests from it—appealed to teams that treat API contracts as the source of truth.

Kong’s acquisition brought resources and enterprise features, but it also introduced a recurring source of frustration: account requirements. At various points, Insomnia has pushed users toward cloud sync and login in ways that felt heavy-handed for a desktop tool. The company has walked some of that back, and the current version supports local vaults and Git sync, but the whiplash left a mark on community trust.

Where Insomnia still shines is the editing experience. The request builder is fast, keyboard-driven, and pleasant for solo work. Plugin support via Node.js lets you extend behavior. For an individual developer or a small team that wants a slick client without Postman’s sprawl, it’s a reasonable pick.

The weaker spots are collaboration and CI. Insomnia’s collection runner and CLI story aren’t as developed as Postman’s, and team features are tied to Kong’s ecosystem. If you need to run the same test suite locally and in a pipeline with identical results, you’ll do more plumbing here.

Bruno: Files on Disk, Git as the Backend

Bruno takes the opposite approach. Instead of syncing collections to a cloud service, it stores them as plain-text files in a folder you choose—typically inside your repo. Requests use a custom .bru format that’s readable in any text editor. Diffs show up in pull requests like any other code change.

That single design decision solves several problems at once. There’s no vendor lock-in on your API definitions. There’s no per-seat cost for collaboration, because collaboration happens through Git, which your team already pays for. Sensitive values stay on your machine. And because collections live next to the code, they don’t drift out of sync with the services they test.

Bruno’s feature set has filled out considerably. It supports REST, GraphQL, and gRPC, includes a CLI (bru) for running collections in CI, and offers environment management, scripting, and assertions. The desktop app is lightweight compared to Postman’s Electron footprint.

The trade-offs are the mirror image of Postman’s advantages. There’s no hosted documentation portal, no built-in monitoring, and no public network of shared collections. Onboarding a non-technical stakeholder who just wants to click “Send” on an endpoint requires more hand-holding. Bruno is also a younger project, so you’ll occasionally hit rough edges or missing conveniences that mature tools have sanded down. The company behind it offers a paid API testing product for teams that want hosted features, but the core client remains open source and local-first.

Head-to-Head on What Matters

Collaboration. Postman wins on breadth—real-time editing, comments, shared workspaces. Bruno wins on model—Git-based review fits how engineering teams already work. Insomnia sits in between and satisfies neither camp fully.

CI and automation. Postman with Newman is the most battle-tested path. Bruno’s CLI is capable and improving. Insomnia trails here.

Cost at scale. Bruno is free and open source; your only cost is Git infrastructure you already run. Postman and Insomnia both gate meaningful team features behind per-user subscriptions.

Data control. Bruno keeps everything local by default. Postman and Insomnia can be configured for local or self-hosted use, but their default posture is cloud sync.

Protocol support. All three handle REST well. Insomnia and Bruno have strong GraphQL and gRPC support. Postman covers both plus WebSocket, MQTT, and others.

Learning curve. Insomnia and Bruno feel lighter to start. Postman rewards investment with features you may not need on day one.

Which Should Your Team Pick?

There’s no universal answer, but the decision usually comes down to a few questions.

If your organization spans multiple roles—engineers, QA, technical writers, support—and you need shared documentation, monitoring, and governance in one platform, Postman’s breadth justifies its cost. The per-seat pricing is the price of admission for a tool that non-engineers can use.

If you’re a small team or solo developer who values a fast, clean client and doesn’t need heavy collaboration features, Insomnia remains a solid choice, provided you’re comfortable with Kong’s direction and account requirements.

If your team lives in Git, cares about keeping API definitions versioned with code, and would rather not pay per seat for collaboration, Bruno is the strongest fit. It’s the choice that treats your collections like the code artifacts they are.

Many teams end up mixing: Bruno or Insomnia for daily development, Postman for the public-facing documentation and monitoring that other tools don’t replicate. That’s not indecision—it’s matching tools to jobs.

The Takeaway

The API client market has split along a clear axis: hosted platforms versus local-first tools. Postman bets that collaboration and lifecycle management belong in the cloud, and charges accordingly. Bruno bets that your API definitions belong in your repo, and gives the client away. Insomnia occupies the middle ground with a polished interface and an uncertain long-term identity under Kong.

Match the tool to how your team already works. If your source of truth is a shared cloud workspace, Postman. If it’s a Git repository, Bruno. If it’s a single developer’s laptop and the scope is modest, Insomnia still earns its place. The wrong choice isn’t the one with fewer features—it’s the one that fights your existing workflow.