Postman vs Insomnia vs Bruno: Best API Testing Tool for Developers in 2025

In a 2024 survey by Postman, over 60% of developers reported spending at least four hours per week on API-related tasks, yet nearly half said they were still searching for the “right” tool to streamline their workflow. The API client market has never been more crowded, and the stakes are high: choose the wrong tool, and you’re stuck with sluggish performance, confusing collaboration features, or—worse—a licensing model that changes under your feet.

For years, the conversation was simple: Postman vs. Insomnia. But 2024 changed everything. Bruno, an open-source upstart with a radical “offline-first” philosophy, has become the fastest-growing API client on GitHub, amassing over 25,000 stars in under two years. So, which tool deserves a place in your 2025 toolbelt?

This guide breaks down the three contenders across performance, collaboration, security, and pricing—no hype, just the facts you need to make an informed decision.

The Current Landscape: Why 2025 Is Different

The API testing market is undergoing a quiet revolution. The old guard (Postman) is pushing hard into enterprise AI features. The middle child (Insomnia) was acquired by Kong in 2021, leading to a controversial revamp. And the new kid (Bruno) is betting that developers are tired of cloud-dependent, account-required tools.

Before diving into comparisons, here’s the one question that should drive your choice: Do you want your API tool to be a collaborative cloud platform or a local-first developer utility?

Postman and Insomnia assume the former. Bruno assumes the latter. That philosophical split determines everything else.

Postman: The 800-Pound Gorilla (Still)

What It Does Well

Postman remains the most feature-complete API client on the market. With over 30 million registered users, it’s the default choice in most corporate environments. The tool excels at:

  • Collaboration: Postman’s cloud workspaces allow teams to share collections, environments, and mock servers in real time. The review/comment system is mature and widely adopted.
  • API Governance: The 2024 addition of “API Governance” rules lets admins enforce naming conventions, authentication standards, and schema compliance across teams. This is a killer feature for enterprises with compliance requirements.
  • AI Integration: Postman’s “Postbot” (powered by GPT-4) can generate test scripts, debug responses, and auto-generate documentation from your requests. It’s genuinely useful for boilerplate work.

The Pain Points

Postman’s biggest weakness in 2025 is performance. The Electron-based desktop app is notoriously memory-hungry. On a 16GB MacBook Pro, running Postman alongside Chrome and VS Code can push your system to its limits. Users frequently report 2-3 second delays when switching between requests in large collections.

There’s also the monetization creep. In 2023, Postman restricted several collaboration features to paid tiers. The free tier now caps shared collections at three members. For solo developers, this is fine; for small teams, it’s a nagging limitation.

Pricing: Free tier available. Paid plans start at $14/user/month (Pro) and $49/user/month (Enterprise). A 2025 update introduced usage-based pricing for AI features, which can surprise teams with large API volumes.

Best For

Enterprise teams that need governance, audit trails, and deep collaboration, and who are willing to pay for it.

Insomnia: The Middle Ground (But for How Long?)

What It Does Well

Insomnia, now owned by Kong, offers a cleaner, faster alternative to Postman. Its redesigned UI (v4, launched in 2023) is arguably the most polished interface of the three. Key strengths include:

  • Performance: Built on Electron like Postman, but Insomnia’s architecture is leaner. It handles large collections (10,000+ requests) with noticeably less lag.
  • GraphQL Support: Insomnia has the best native GraphQL editor of the three. Autocomplete, schema introspection, and query variables work flawlessly.
  • Kong Ecosystem Integration: If you use Kong Gateway or Kong Konnect, Insomnia’s one-click import of services is a major time-saver.

The Pain Points

The 2023 redesign (v4) was controversial. Long-time users complained that the “Insomnia Designer” (used for OpenAPI spec editing) was removed and merged into the main app, making it harder to work with spec-first development. Kong also introduced a mandatory account requirement for cloud sync, which angered privacy-conscious developers.

The biggest concern is strategic direction. Kong’s primary business is API gateways, not client tools. Many developers worry Insomnia is a “loss leader” that could be deprecated or heavily monetized once it reaches critical mass. In 2024, Kong quietly removed the free “Insomnia Cloud” plan, requiring a paid subscription for any sync beyond local files.

Pricing: Free for core features. Paid “Insomnia Plus” starts at $5/user/month, and “Enterprise” at $30/user/month.

Best For

Developers who need a fast, modern UI and work heavily with GraphQL, but who don’t need enterprise governance. The low price point makes it attractive for small startups.

Bruno: The Open-Source Disruptor

What It Does Well

Bruno is the most interesting entrant in years. Its core philosophy: your API data should live in your version control system, not in a proprietary cloud. Bruno stores collections as plain text files (in a Git-friendly format), so you can diff, review, and merge API changes just like code.

  • Offline-First: No account. No cloud sync. No telemetry. Open Bruno, and it just works. This is a massive selling point for developers in regulated industries or those who work on planes/coffeeshops with spotty internet.
  • Git-Native Workflow: Since collections are just files, you can use pull requests to review API changes. This is a game-changer for teams that want to enforce code review on API design.
  • Performance: Bruno is built on Electron, but because it does almost no network calls (no cloud sync), it’s surprisingly snappy. Cold startup is under 2 seconds on modern hardware.

The Pain Points

Bruno’s radical approach has real trade-offs:

  • No Built-In Collaboration: There’s no shared workspace where multiple users can edit a collection simultaneously. You must use Git for that. For non-technical team members (QA, product managers), this is a steep learning curve.
  • Limited Scripting: Bruno’s scripting language (a custom JavaScript-like syntax) is less powerful than Postman’s Sandbox or Insomnia’s Node-based scripting. Complex authentication flows (OAuth2 with PKCE, for example) require more manual setup.
  • Younger Ecosystem: The plugin marketplace is sparse. While Postman has hundreds of integrations (AWS, Azure, etc.), Bruno relies on its community, which is still small.

Pricing: 100% free and open-source (MIT license). No paid tiers, no enterprise edition. The company plans to monetize through paid support and a future cloud sync service (optional, not required).

Best For

Developers and small teams who value version control, privacy, and zero-cost tools. Ideal for open-source projects and security-conscious environments.

Head-to-Head Comparison

Feature Postman Insomnia Bruno
Base price Free (limited) Free (limited) Free (unlimited)
Collaboration Cloud workspaces Cloud sync (paid) Git-based only
Performance Heavy Moderate Light
GraphQL support Good Excellent Fair
Scripting Powerful (Node.js) Good (Node.js) Limited (custom)
Offline use Requires account Requires account Fully offline
AI features Yes (Postbot) No No
Open source No No Yes (MIT)

How to Choose: A Decision Tree

Choose Postman if:

  • You work in a team of 5+ developers who need real-time shared editing.
  • You need enterprise features like SSO, audit logs, and governance rules.
  • You rely on AI-assisted test generation or API documentation.

Choose Insomnia if:

  • You’re a solo developer or small team (under 5 people).
  • You work heavily with GraphQL and want the smoothest experience.
  • You want a modern UI without paying Postman’s premium.

Choose Bruno if:

  • You’re a developer who lives in Git and wants API collections in version control.
  • You’re privacy-conscious or work in regulated environments with strict data residency rules.
  • You’re tired of account creation and cloud dependencies for basic tools.

The Verdict for 2025

No single tool wins across every dimension. But here’s our practical take:

  • For enterprise teams: Postman remains the safest bet. Its governance features and AI integration are unmatched, and the cost is justified if you’re saving developer hours on API maintenance.

  • For startups and mid-size teams: Insomnia offers the best balance of performance, price, and features. The $5/user/month price point is a no-brainer for most startups.

  • For the open-source purist or solo dev: Bruno is the future. Its Git-native approach is philosophically sound, and the tool is already good enough for 80% of daily API testing tasks. It’s not ready for enterprise collaboration, but it’s a joy to use.

One final note: Don’t sleep on Bruno’s trajectory. In the last six months, it’s added support for environment variables, scripting enhancements, and a CLI runner. If it continues at this pace, 2026 could see Bruno challenging Postman’s dominance in the mid-market.

The best API tool is the one you’ll actually use every day. Download all three, spend an hour with each, and see which one feels natural. Your muscle memory will thank you.