Postman vs Insomnia vs Bruno: Best API Testing Tool for Developers in 2025
Three tools dominate the conversation when developers argue about API clients: Postman, Insomnia, and Bruno. Each has a distinct philosophy about where your request collections should live, how much a GUI should do for you, and what “open source” actually means in practice. If you’re picking one in 2025, the decision comes down to more than feature checklists—it’s about workflow, collaboration, and how much you trust the cloud with your API definitions.
Here’s how the three stack up.
The Short Version
- Postman is the most feature-complete platform, with the deepest collaboration, mocking, monitoring, and documentation tooling. It’s also the heaviest, and its cloud-first model means your collections live on Postman’s servers by default.
- Insomnia sits in the middle: a polished GUI with strong GraphQL and gRPC support, now owned by Kong. It offers local and cloud storage options but has shifted its open-source posture over time.
- Bruno is the newcomer built around a single idea: collections are plain-text files stored in your Git repo, not in someone else’s cloud. It’s offline-first, open source, and deliberately minimal.
Postman: The Incumbent With the Deepest Toolkit
Postman started as a Chrome extension in 2012 and grew into something closer to an API development platform than a client. In 2025 it covers request building, automated testing, mock servers, API documentation, monitoring, and a workspace model that supports team collaboration at scale.
Where it wins:
- Breadth. If you need to generate documentation from your collection, schedule monitors, or spin up mock servers for frontend work, Postman does it without leaving the app.
- Collaboration. Shared workspaces, role-based access, and version history make it the default choice for teams that need non-engineers (QA, product, support) to interact with APIs.
- Ecosystem. The Postman API, CLI (Newman), and CI integrations are mature and widely documented.
Where it grates:
- Weight. The desktop app is resource-hungry. On older machines it’s noticeably sluggish compared to lighter clients.
- Cloud-first defaults. Collections sync to Postman’s cloud unless you deliberately work locally. For teams with strict data governance or air-gapped environments, that’s a real constraint.
- Account requirements. Postman has pushed users toward signing in, which frustrates developers who just want to fire off a request.
Pricing in 2025 runs from a free tier (limited collaboration) through paid per-user plans, with enterprise pricing on request. For solo developers the free tier is usually enough; for teams, costs add up quickly.
Insomnia: Polished, GraphQL-Friendly, Kong-Owned
Insomnia carved out a niche by being faster and cleaner than Postman while still offering a proper GUI. Its GraphQL editor—with schema introspection and autocomplete—remains one of the best in any client, and its gRPC support is solid.
Where it wins:
- Design and speed. The interface is less cluttered than Postman’s, and it feels quicker for day-to-day request work.
- Protocol coverage. REST, GraphQL, gRPC, and WebSockets are all handled well.
- Flexible storage. You can keep data locally, sync via Git, or use Insomnia’s cloud sync.
Where it grates:
- Licensing history. Insomnia’s shift away from a fully open-source model after the Kong acquisition left a bad taste for some developers. The core is still available, but the open-source story is muddier than Bruno’s.
- Plugin ecosystem. It exists, but it’s smaller and less active than Postman’s.
- Account friction. Like Postman, newer versions nudge you toward creating an account.
Insomnia’s pricing follows a similar pattern to Postman: a free tier plus paid plans for teams, with enterprise options.
Bruno: Offline-First, Git-Native, Open Source
Bruno arrived with a contrarian pitch: your API collections should be files on your disk, versioned in Git like the rest of your code. No cloud account, no sync service, no lock-in.
Collections are stored in a plain-text format (.bru files), which means diffs are readable, merge conflicts are manageable, and code review works the way it does for any other source file. That single design decision is why Bruno has picked up traction among developers who were tired of cloud-synced collections.
Where it wins:
- Git-native workflow. Collections live in your repo. Reviewing an API change is just a pull request.
- Offline by default. No account, no telemetry-by-default, no dependency on a vendor’s uptime.
- Open source. The core client is genuinely open source, which matters for teams with compliance requirements.
- Lightweight. It launches fast and stays out of the way.
Where it grates:
- Younger ecosystem. Bruno doesn’t yet match Postman’s mocking, monitoring, or documentation features. If you need a full API platform, it won’t replace Postman today.
- Collaboration model. Git-based collaboration is elegant for engineers but awkward for non-technical teammates who don’t use Git.
- Smaller community. Fewer plugins, fewer tutorials, fewer Stack Overflow answers when something breaks.
Bruno offers a free open-source client plus paid plans aimed at teams that want shared features without giving up the file-based model.
Head-to-Head Comparison
| Feature | Postman | Insomnia | Bruno |
|---|---|---|---|
| Storage model | Cloud-first, local option | Local, Git, or cloud | Local files, Git-native |
| Open source | Partially | Partially | Yes (core) |
| GraphQL support | Good | Excellent | Good |
| gRPC support | Good | Good | Basic |
| Mock servers | Yes | Limited | No |
| CI/CLI tooling | Mature (Newman) | Available | Available |
| Account required | Effectively yes | Nudged | No |
| Best for | Large teams, full platform | GraphQL-heavy solo/team work | Git-centric engineering teams |
How to Choose
The decision usually comes down to three questions.
Do you need collaboration features beyond engineers? If QA, support, or product folks need to poke at your APIs, Postman’s workspace model is hard to beat. Bruno’s Git workflow assumes everyone involved is comfortable with version control.
How sensitive is your API data? If your organization restricts where API definitions can live, Bruno’s local-first model and Postman’s local workspace option are worth weighing carefully. Insomnia’s flexibility helps here too.
How much platform do you actually need? If you want mocking, monitoring, and generated docs in one place, Postman earns its weight. If you mainly send requests and write tests, Bruno or Insomnia will feel lighter and faster.
A pragmatic pattern some teams adopt: use Bruno or Insomnia for daily development, and keep Postman around for the platform features—or migrate fully once the lighter tool covers your needs.
The Takeaway
There’s no universal winner in 2025, because the three tools optimize for different things. Postman optimizes for breadth and team collaboration. Insomnia optimizes for a clean, protocol-rich GUI. Bruno optimizes for developer workflow and data ownership. Pick based on where your collections should live and who needs to touch them—not on which tool has the longest feature list. The best API client is the one your team actually keeps using six months from now.