Best API Testing Tools in 2025: Postman vs Insomnia vs Bruno Compared

A 2024 Postman State of the API report found that developers spend roughly 40% of their working time on APIs—designing, testing, debugging, and documenting them. That’s a staggering share of the workweek, which explains why the choice of an API client has become almost as personal as the choice of an IDE. For years, Postman was the default answer. Then Insomnia carved out a niche among developers who wanted something lighter and more design-focused. And in 2023, a new challenger appeared: Bruno, an offline-first, Git-friendly client that quickly attracted tens of thousands of GitHub stars.

By 2025, all three tools have matured, and the decision is no longer obvious. This comparison breaks down how Postman, Insomnia, and Bruno differ in architecture, pricing, collaboration, and day-to-day workflow—so you can pick the one that fits how your team actually works.

The Contenders at a Glance

Feature	Postman	Insomnia	Bruno
First released	2012	2016	2023
Pricing model	Freemium, per-user	Freemium, per-user	Free core, one-time paid tiers
Data storage	Cloud-first	Cloud or local	Local files only
Git-friendly	Partial (cloud sync)	Partial	Native (plain-text collections)
Open source	Limited (some components)	Core is open source	Fully open source
Best for	Large teams, enterprise	Individual devs, API design	Privacy-conscious, Git-centric teams

Postman: The Incumbent With the Deepest Feature Set

Postman remains the most widely used API platform, and for good reason. It covers nearly the entire API lifecycle: sending requests, writing automated test suites, generating documentation, mocking servers, running monitors, and managing workspaces for teams.

Strengths:

• Breadth of features. Collection Runner, Newman (CLI), mock servers, and API governance tools mean you rarely need a second product.
• Collaboration. Cloud workspaces, role-based access, and commenting make it easy for large or distributed teams to share collections.
• Ecosystem. Integrations with CI/CD pipelines, GitHub, and most major API gateways are mature and well documented.
• Learning resources. Tutorials, community forums, and certification programs are extensive.

Weaknesses:

• Cloud dependency. Collections live in Postman’s cloud by default. While local storage exists, the product’s gravity pulls toward its servers.
• Pricing pressure. The free tier is generous for individuals, but team plans are billed per user per month, and costs climb fast as headcount grows. Basic paid plans start around $14 per user per month, with higher tiers for advanced governance.
• Performance. The desktop app has grown heavier over the years; some developers report sluggish startup and memory usage compared to lighter alternatives.

Postman is the safe choice for enterprises that need governance, SSO, and a single platform for the whole API lifecycle. For a solo developer or a small team that just wants to fire off requests, it can feel like overkill.

Insomnia: Polished UX With a Design-First Philosophy

Insomnia, now owned by Kong, built its reputation on a cleaner interface and strong support for GraphQL and REST alike. It appeals to developers who value a focused, fast client over an all-in-one platform.

Strengths:

• Clean, fast UI. Insomnia’s interface is generally considered more intuitive than Postman’s, especially for quick request building.
• GraphQL support. First-class GraphQL query editing, schema introspection, and autocomplete make it a favorite among GraphQL users.
• Design and debugging tools. Environment variables, request chaining, and plugin extensibility cover most everyday needs.
• Open-source core. The core client is open source, which appeals to developers who want to inspect or contribute to the code.

Weaknesses:

• Pricing changes. Kong has adjusted Insomnia’s plans over time, and some features that were once free—like certain collaboration and sync capabilities—now sit behind paid tiers. This has caused friction in the community.
• Account requirements. Using Insomnia increasingly nudges users toward creating an account, which rankles privacy-focused developers.
• Smaller ecosystem. Fewer integrations and less enterprise tooling than Postman.

Insomnia strikes a balance: more polished than Postman for individual work, more feature-rich than Bruno for teams that want cloud sync. But its shifting pricing model is worth watching before committing.

Bruno: The Offline-First Challenger

Bruno arrived in 2023 with a simple, contrarian pitch: your API collections should be plain text files stored on your machine, versioned in Git like any other code. No cloud account required. No proprietary format.

Strengths:

• Local-first, Git-native. Collections are saved as .bru files in your project directory. You commit them, branch them, and review them in pull requests just like source code. This is a genuine workflow improvement for teams that already live in Git.
• Privacy by default. Nothing leaves your machine unless you explicitly share it. For developers in regulated industries or those who simply distrust cloud sync, this is a major selling point.
• Free and open source. The core app is fully open source and free, with optional one-time paid licenses for team features. No subscription required for individual use.
• Lightweight. The app is fast and lean, with a small footprint compared to Postman.

Weaknesses:

• Younger ecosystem. Bruno is the newest of the three, so fewer plugins, integrations, and third-party tutorials exist.
• Fewer enterprise features. SSO, advanced governance, and mock servers are limited or absent compared to Postman.
• Manual collaboration. Because there’s no cloud sync, sharing collections means using Git—great for engineering teams, less convenient for non-technical stakeholders.

Bruno is the clear pick for teams that treat API collections as code and want to avoid vendor lock-in. It’s less suited to organizations that need a hosted collaboration hub.

How to Choose in 2025

The right tool depends less on feature checklists and more on your team’s constraints:

• Choose Postman if you need enterprise governance, SSO, mock servers, and a single platform spanning design, testing, and monitoring—and you’re comfortable with per-user subscription pricing.
• Choose Insomnia if you want a fast, polished client with strong GraphQL support and don’t mind a cloud account for sync and collaboration.
• Choose Bruno if privacy, offline access, and Git-based version control matter more than cloud conveniences, or if you want to avoid recurring per-seat costs.

It’s also worth noting that these tools aren’t mutually exclusive. Many developers keep Bruno or Insomnia for personal projects and use Postman at work because that’s what the team standardized on. Migration between them is possible—Postman and Insomnia can import OpenAPI specs, and Bruno can import from both—so the switching cost is lower than it once was.

The Bottom Line

Postman, Insomnia, and Bruno now represent three distinct philosophies: a comprehensive cloud platform, a polished middle ground, and an offline-first, code-centric challenger. Postman still wins on breadth and enterprise readiness. Insomnia offers the best balance of usability and features for individual developers and small teams. Bruno delivers the most developer-friendly workflow for anyone who believes API collections belong in version control alongside the code they test.

If you’re unsure, start with the free tier of each and run a real project through all three for a week. The tool that disappears into your workflow—rather than demanding attention—is usually the right one.