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

Three API clients now dominate the conversation among developers: Postman, the long-time market leader; Insomnia, the design-focused challenger; and Bruno, the open-source newcomer that stores collections as plain files on your disk. Each has made significant changes in the past two years, and the “best” choice depends heavily on whether you prioritize team collaboration, local-first ownership, or a clean interface.

Here’s how they compare on the things that actually matter: pricing, offline behavior, version control, collaboration, and day-to-day workflow.

The 2025 Landscape at a Glance

Postman remains the most widely used API platform, with millions of registered developers and deep penetration in enterprise teams. Its scope has expanded well beyond a desktop client into API design, documentation, mock servers, and automated testing.

Insomnia, acquired by Kong in 2019, has evolved into a tool aimed at developers who want a polished request-building experience with strong support for GraphQL, gRPC, and REST in one place.

Bruno launched in 2022 as a direct reaction to cloud-first tools. Its pitch is simple: your API collections live in a folder on your filesystem, in a human-readable format (.bru files), and you sync them with Git like any other code. The project has grown quickly, surpassing 30,000 GitHub stars, and now offers a paid commercial edition alongside its free core.

Pricing: Where the Real Differences Show Up

Postman uses a generous free tier for individuals, but team features sit behind paid plans. The Basic plan runs about $14 per user per month (billed annually), and Professional is around $29 per user per month. Enterprise pricing is custom. The catch: several features that used to be free—like some collaboration and version control capabilities—now require a paid seat, and Postman has periodically adjusted what falls inside the free tier.

Insomnia offers a free tier and paid plans starting around $12 per user per month for the Individual plan, with Team and Enterprise tiers above that. Since Kong’s restructuring of Insomnia’s pricing in 2023, some users have grumbled about features moving behind paywalls, particularly around Git sync and collaboration.

Bruno is free and open source under the MIT license for the core desktop app. The paid “Bruno Plus” tier (roughly $6–$12 per user per month depending on plan) adds team collaboration features like a shared workspace and cloud sync. Crucially, the free version doesn’t limit you to a cloud account—it works entirely offline.

For solo developers or small teams on a budget, Bruno’s free tier is hard to beat. For organizations that need SSO, audit logs, and admin controls, Postman’s enterprise offering is the most mature.

Offline and Local-First Workflows

This is Bruno’s strongest differentiator. Every collection is a folder of plain-text files. You can open it in any editor, diff it in a pull request, and resolve merge conflicts like code. There’s no proprietary export format, no account required to open your own requests, and no risk of losing access if a vendor changes its terms.

Postman historically stored collections in its cloud, though the desktop app caches data locally. In 2023, Postman faced backlash when users discovered that some collections became inaccessible offline or after the company’s cloud services had issues. Postman has since improved local caching, but the fundamental architecture remains cloud-first.

Insomnia sits in between. It stores data locally in a SQLite database by default, and you can enable Git sync for version control. However, the format isn’t as cleanly diffable as Bruno’s, and the Git integration has been a point of friction for some users.

If your team already lives in Git and wants API definitions reviewed alongside application code, Bruno’s model fits naturally. If you want zero setup and don’t mind the cloud, Postman is frictionless.

Collaboration and Team Features

Postman wins on raw collaboration depth. Shared workspaces, role-based permissions, comments on requests, change history, API documentation generation, mock servers, and monitors are all built in. For a team of 20 that needs a single source of truth for API contracts, Postman’s ecosystem is difficult to replicate.

Insomnia offers team workspaces and shared environments on paid plans, plus a decent plugin ecosystem. It’s capable, but the collaboration surface area is narrower than Postman’s.

Bruno’s collaboration story is newer. The free version relies on Git for sharing, which works well for engineering teams but requires discipline. Bruno Plus adds a hosted workspace with real-time sync, but it’s still catching up to Postman’s feature set for non-technical stakeholders.

One practical consideration: if your API documentation needs to be shared with product managers, QA, or external partners, Postman’s published docs and web-based viewer are a genuine advantage. Bruno and Insomnia assume a more developer-centric audience.

Developer Experience and Performance

All three handle the basics—REST, environment variables, authentication helpers, code generation—competently.

Postman has the largest feature set, which can also make it feel heavy. Startup times and memory usage have drawn complaints, particularly on older machines. The scripting environment (using JavaScript) is powerful but has a learning curve.

Insomnia is often praised for its clean, fast interface and excellent GraphQL support, including schema introspection and query autocomplete. Its plugin system lets you extend behavior, though the plugin ecosystem is smaller than Postman’s.

Bruno is lightweight and fast, with a straightforward UI. Its scripting uses a JavaScript-like syntax, and the .bru format is easy to read and edit by hand. Some advanced features—like certain authentication flows and testing capabilities—are less mature than Postman’s.

For pure request-building speed on a modern machine, Insomnia and Bruno generally feel snappier. For breadth of features, Postman leads.

Security and Data Ownership

Postman stores data in its cloud, which raises questions for teams with strict data residency or compliance requirements. Postman offers SOC 2 compliance and enterprise controls, but the data still leaves your infrastructure unless you use certain enterprise configurations.

Insomnia stores data locally by default, which is a plus for privacy-conscious developers, though cloud sync features change that.

Bruno’s local-first design means your API keys and requests never leave your machine unless you explicitly enable sync. For developers handling sensitive endpoints, that’s a meaningful default.

So Which Should You Choose?

There’s no universal winner, but the decision tree is fairly clear:

• Choose Postman if you work in a larger organization that needs documentation, monitoring, mock servers, and enterprise controls in one platform, and you’re comfortable with cloud storage and per-seat pricing.
• Choose Insomnia if you want a fast, clean client with strong GraphQL and gRPC support, and you prefer local storage with optional sync.
• Choose Bruno if you value open-source software, want your collections versioned in Git as plain files, and prefer to avoid vendor lock-in or mandatory accounts.

Many developers use more than one. It’s common to keep Bruno or Insomnia for personal projects and Postman for team work, or to run Bruno in a Git-centric backend team while a platform group standardizes on Postman.

The Bottom Line

The API client market has finally produced a real alternative to the cloud-first model. Postman remains the most feature-complete platform, Insomnia offers a polished middle ground, and Bruno has made local-first, Git-friendly API development genuinely practical. In 2025, the question isn’t which tool is objectively best—it’s whether you want your API collections to live in someone else’s cloud or in your own repository. Answer that, and the choice becomes obvious.