Postman vs Insomnia vs Bruno: Which API Client Is Best for Developer Teams in 2025

Every engineering team eventually has the same argument. Someone opens a pull request and, buried inside it, is a new .json file full of API requests. A teammate asks why it isn’t in the shared workspace. A third person points out that the workspace is behind a paid tier. And somewhere in the background, a new hire is still waiting on credentials to test their first endpoint.

API clients have quietly become infrastructure. They hold the requests that define how your services talk to each other, and the choice of one shapes onboarding, code review, and how much of your budget goes to a SaaS vendor. In 2025, three tools dominate the conversation: Postman, Insomnia, and Bruno. Each takes a genuinely different position on how that infrastructure should work.

The Contenders at a Glance

Postman is the incumbent. Founded in 2014, it grew from a Chrome extension into a full API platform covering design, testing, mocking, documentation, and monitoring. It is the default in most organizations simply because everyone already has it.

Insomnia built its reputation on a cleaner interface and strong GraphQL and gRPC support. Kong acquired it in 2019, and the product has since been folded into Kong’s broader API lifecycle story.

Bruno is the newcomer, launched in 2022 as an open-source, offline-first client. Its central bet is that API collections belong in your Git repository as plain text files, not on someone else’s servers.

Postman: The Platform Play

Postman’s strength is scope. If your team needs shared environments, automated test suites with assertions, mock servers that let frontend work proceed before the backend exists, and generated documentation, Postman does all of it without leaving the app. The collection runner and the CLI (newman) make it possible to wire API tests into CI, which is a real advantage for teams that want contract checks on every build.

The friction shows up in two places. First, collaboration is tied to Postman’s cloud. Collections live in workspaces, and while you can export them as JSON, that export is a snapshot rather than a source of truth. Reviewing API changes in a pull request means diffing large generated files that were never designed to be read by humans. Second, pricing has become a recurring complaint. Postman’s free tier covers basic use, but features teams actually need at scale—SSO, role-based access control, more collaboration seats—sit behind per-user pricing that adds up quickly across a large engineering org. Postman has also been moving aggressively into AI-assisted features, which is useful if you want them and noise if you don’t.

None of this makes Postman a bad choice. For a team that wants one tool for the entire API lifecycle and is willing to pay for it, it remains the most complete option.

Insomnia: Polished, But in Transition

Insomnia’s editor is genuinely pleasant. Request chaining, environment variables, and a responsive UI made it a favorite among individual developers and small teams, particularly those working with GraphQL, where its schema introspection and query autocomplete are better than most alternatives.

The complication is ownership. Since Kong’s acquisition, Insomnia has been repositioned as an entry point to Kong’s API management platform. That’s a reasonable business strategy, but it means the product’s roadmap is no longer purely about being the best standalone client. Users have noticed: the shift to a mandatory account for cloud sync in 2023 prompted a visible backlash, and some teams began looking for tools that wouldn’t change direction under them.

Insomnia still offers a local vault and a free tier, and for a developer who wants a fast, attractive client for solo work, it holds up. For a team making a multi-year decision, the question is whether Insomnia’s priorities will align with theirs in three years. That’s a harder question than it used to be.

Bruno: Git-Native and Offline by Default

Bruno’s pitch is narrow and sharp: your API collection is a folder of .bru files that you commit alongside your code. There is no cloud account required, no sync service in the middle, and no proprietary database. Open the folder in Bruno and you see the requests. Open it in your editor and you see readable text. Open a pull request and reviewers can actually see what changed.

That single design decision solves several problems at once. Onboarding becomes a git clone. Secrets stay out of a vendor’s servers because environments are local files you can gitignore. Code review of API changes works the way code review is supposed to work. And because the format is plain text, there’s no meaningful lock-in—if Bruno disappears tomorrow, your collections are still sitting in your repository.

The trade-offs are real. Bruno is younger, so its ecosystem of plugins, integrations, and community collections is thinner. Features that Postman users take for granted—managed mock servers, hosted documentation, granular team permissions—either don’t exist or require workarounds. The desktop app has matured quickly, but teams that depend on heavy automation or enterprise governance may find gaps.

For teams whose primary need is a shared, versioned collection that lives with the code, Bruno’s trade-offs are easy to accept. For teams that want a managed platform, they aren’t.

How to Choose

The decision usually comes down to three questions.

Where should your collections live? If the answer is “in our repository, reviewed like code,” Bruno is the natural fit. If it’s “in a shared cloud workspace with fine-grained permissions,” Postman is built for that. Insomnia sits in between, with local storage and optional sync.

How much of the API lifecycle do you need? Design, mocking, documentation, monitoring, and CI-integrated testing in one place points to Postman. A focused client for sending requests and organizing them points to Bruno or Insomnia.

How sensitive are you to vendor direction? Postman and Insomnia are venture-backed or corporate-owned products with commercial roadmaps. Bruno is open source with a paid team tier. If your organization has been burned by pricing changes or forced migrations before, that difference matters more than any feature comparison.

A practical pattern is emerging at some companies: Bruno or Insomnia for day-to-day development and versioned collections, Postman for the narrower set of teams that need hosted mocks and documentation. The tools aren’t mutually exclusive, and treating them as a single winner-take-all decision often creates more friction than it resolves.

The Takeaway

There is no universally best API client in 2025, and the framing of “best” obscures the real choice. Postman wins on breadth and enterprise features, at the cost of cloud dependency and per-seat pricing. Insomnia offers a polished experience with genuine uncertainty about where its corporate parent will take it. Bruno trades ecosystem maturity for a Git-native, offline-first model that fits how most engineering teams already work.

Pick the tool whose core assumption matches yours. If your API collections are code, treat them like code. If they’re a managed asset, manage them. The teams that struggle are the ones that pick a tool for its feature list and then discover, a year later, that they disagree with its fundamental model.