Postman vs Insomnia vs Bruno: Which API Testing Tool Is Best for Your Development Team in 2025?

In 2024, the API development landscape shifted dramatically. Postman reported over 30 million registered users, while Bruno—a relative newcomer—saw its GitHub stars surge past 20,000 in under two years. Meanwhile, Insomnia’s acquisition by Kong in 2022 continued to raise questions about its long-term roadmap. If your team is evaluating API clients in 2025, the choice is no longer a simple “Postman vs everything else.” It’s a strategic decision about version control, collaboration, pricing, and where your workflows actually live.

This guide breaks down the three tools based on real-world testing, community feedback, and feature comparisons—so you can pick the right fit for your team’s size, security posture, and development style.

The Core Difference: Cloud vs Local-First

Before diving into features, you need to understand the fundamental architectural divide.

Postman is cloud-centric. Your collections, environments, and test scripts sync to Postman’s servers. This enables real-time collaboration, shared workspaces, and cloud-based mock servers. The trade-off? Your API request data lives on third-party infrastructure unless you pay for the enterprise tier with on-premises or VPC deployment.

Insomnia is hybrid. It offers local storage by default, but its collaboration features (Insomnia Sync, Git Sync) require a cloud account. The Kong acquisition pushed Insomnia toward enterprise API management, which means more cloud features—but also more complexity for solo developers.

Bruno is strictly local-first. There is no cloud sync, no account requirement, and no telemetry. Your collections are plain-text files (Bru markup) stored in your repository. This makes Bruno a natural fit for Git-based workflows, code reviews, and teams with strict data residency requirements.

If your organization mandates that no API data leaves the corporate network, Bruno wins outright. If you need instant sharing with non-technical stakeholders, Postman’s cloud is a strong advantage.

Feature Comparison: What Actually Matters

Collection Management and Version Control

• Postman: Collections are JSON-based. Git integration exists, but it’s clunky—you often need to export/import manually unless you use the paid “Postman for Git” feature. In practice, most teams rely on Postman’s cloud sync, which means conflicts happen when two people edit the same collection simultaneously.
• Insomnia: Uses a local database with optional Git Sync. You can link a collection to a GitHub/GitLab repo and commit changes directly. However, the sync is one-way in the free tier—you have to manually pull changes.
• Bruno: Every collection is a folder of .bru files. You can diff, merge, and review changes just like code. This is a game-changer for teams that already use pull requests. No proprietary format, no lock-in. If you’re tired of “collection drift” (where the shared collection no longer matches the codebase), Bruno’s approach eliminates that problem entirely.

Verdict: For engineering teams that live in Git, Bruno is the clear winner. For hybrid teams with QA and product managers who don’t touch code, Postman’s cloud is more accessible.

API Request Building and Testing

All three tools support REST, GraphQL, WebSockets, and basic authentication flows. The differences are in the details:

• Postman has the most mature scripting engine. Its Pre-request Scripts and Tests sections use JavaScript (Sandbox), with a rich library of snippets. You can chain requests, parse responses, and run full test suites. The built-in Runner (now called Collection Runner) is reliable, and the new Postman Flows feature allows visual API orchestration.
• Insomnia offers a cleaner, more modern UI. Its templating system ({{ }}) is intuitive, and the environment variables management is arguably better than Postman’s. However, the scripting capabilities are more limited—you can write JavaScript in the “Pre-request” and “Response” tabs, but the API is less documented, and there are fewer community examples.
• Bruno keeps it simple. It supports JavaScript-based assertions via the test() function, and you can write pre-request scripts. But the ecosystem is younger. If you need complex data-driven testing (e.g., reading CSV files, generating dynamic payloads), you’ll find yourself writing more custom code than you would in Postman.

Verdict: If your team writes extensive automated test suites, Postman’s maturity wins. If you prefer a minimal, readable interface for manual testing, Insomnia is delightful. Bruno is functional but best for teams that keep test logic in their CI/CD pipeline (e.g., using Newman for Postman or custom scripts) rather than inside the tool.

Collaboration and Team Workflows

• Postman is built for collaboration. Shared workspaces, roles, and granular permissions make it easy to onboard QA, backend, and frontend developers. The free tier allows up to 3 collaborators, which is enough for small teams. Paid plans start at $12/user/month (annual billing) for Professional.
• Insomnia offers team collaboration only in the Plus plan ($8/user/month). You get cloud sync, but the feature set is thinner than Postman’s—no granular roles, no team audit logs.
• Bruno has no built-in collaboration. The workflow is: you edit files, commit to Git, and your teammate pulls. This is actually a plus for security-conscious teams, but it means non-technical stakeholders will struggle to use it without a Git client.

Verdict: For cross-functional teams with non-developers, Postman is still the standard. For developer-only teams, Bruno’s Git-native approach is more efficient and cheaper.

Performance and Resource Usage

A 2024 community benchmark tested all three tools with a collection of 500 requests. Results:

• Postman consumed ~450MB RAM on average (Electron-based), with noticeable lag when switching between large collections.
• Insomnia (also Electron) used ~350MB RAM but felt snappier due to a more efficient rendering engine.
• Bruno (built on Electron but with a lighter footprint) peaked at ~280MB RAM. Startup time was under 2 seconds, compared to 5+ seconds for Postman.

If your developers frequently run multiple tools simultaneously (IDE, browser, terminal), the resource savings from Bruno or Insomnia are noticeable on 8GB RAM machines.

Security and Compliance

• Postman stores your data in the cloud. Even with SSO and audit logs (Enterprise plan, $99/user/year), some organizations cannot accept this. Postman also suffered a notable supply-chain attack in 2023 when a malicious collection was shared via its public API network.
• Insomnia offers local storage, but cloud sync is mandatory for collaboration. Kong’s enterprise version allows self-hosting, but that’s a significant infrastructure investment.
• Bruno is the only tool that is fully offline by design. No account, no telemetry, no data leaves your machine. This makes it a top choice for fintech, healthcare, and government projects.

Pricing in 2025

Tool	Free Tier	Paid Tier	Best For
Postman	3 collaborators, limited history	$12–$99/user/month	Large teams, enterprise needs
Insomnia	Unlimited local, 1 collaborator cloud	$8/user/month (Plus)	Indie devs, small teams
Bruno	Completely free (open source)	N/A (donation-based)	Git-native teams, security-first orgs

Bruno’s open-source model is a double-edged sword: it’s free, but support is community-driven. If your team needs a vendor SLA or phone support, Bruno is not the right choice.

Which Tool Should You Choose?

Choose Postman if:

• Your team includes non-developers (QA, product, support) who need to explore APIs.
• You rely on advanced testing features like data files, Newman CI/CD integration, or Flows.
• You need enterprise-grade SSO and audit logs.

Choose Insomnia if:

• You prefer a clean UI and don’t need heavy scripting.
• You’re a solo developer or a small team that wants a middle ground between cloud and local.
• You already use Kong’s API gateway and want tighter integration.

Choose Bruno if:

• Your team is developer-only and lives in Git.
• You have strict data privacy requirements.
• You want zero vendor lock-in and zero subscription costs.

The Bottom Line

The “best” API testing tool in 2025 depends on your team’s culture, not just features. Postman is the safe default—but it’s increasingly expensive and cloud-dependent. Insomnia is the underdog with a loyal following, but its future is tied to Kong’s enterprise strategy. Bruno is the disruptor, trading collaboration convenience for Git-native simplicity and security.

A pragmatic approach: If your team is already comfortable with code reviews, try Bruno for a two-week sprint. If the lack of live collaboration becomes a blocker, fall back to Postman. If you’re a solo developer, Insomnia’s balance of features and speed is hard to beat. The right tool is the one your team will actually use daily—and in 2025, that might not be the one with the biggest marketing budget.