API Testing Tools Compared: Postman vs Insomnia vs Bruno vs HTTPie vs curl (2026)

TL;DR:

• Bruno is the pick for teams who want version-controlled API collections stored as files alongside code
• Postman is still the most feature-complete option for enterprise teams who need complex environments and automation
• For quick one-off requests, HTTPie’s readable syntax beats curl without requiring a GUI

API testing tools have fragmented a lot over the past couple of years. Postman’s pricing changes pushed many teams — including quite a few British dev teams — to actually look at what else was out there. And honestly? The alternatives have genuinely improved. The right tool depends on whether you care more about collaboration, speed, CI/CD integration, or just getting something working in a terminal.

Postman

Postman is still the most feature-complete API client available. Collections, environments, automated test scripts, mock servers, API documentation generation, a monitoring service for scheduled test runs — it does more than any alternative, full stop.

The friction, though, is real. Postman requires an account, stores collections in its cloud by default, and has gradually shifted its focus toward platform features rather than the core request/response workflow. The desktop app has grown heavier with each release. If you’re evaluating it fresh, that’s worth knowing.

Pricing: Free tier with workspace limits. Basic at $14/user/month for team features. Enterprise starts at $49/user/month — so for a 10-person UK dev team, you’re looking at roughly £560/month at that tier. That adds up.

Best for: Larger teams with complex testing requirements, QA engineers who need scripting and reporting, organisations that want API documentation and mocking in one place.

Insomnia

Insomnia (now owned by Kong) remains a clean, focused alternative. Faster to open, simpler UI, and equally capable for most common request types including REST, GraphQL, and gRPC.

After Kong’s acquisition, the sync and collaboration features moved to a cloud model that some developers find less open than it used to be. The core local functionality stays free; you pay for sync and team features.

Pricing: Free for local use. Teams plan at $7/user/month.

Best for: Solo developers who want a Postman-style GUI without the account requirement friction, REST and GraphQL workflows.

Bruno

Bruno is the tool that’s gained the most traction in 2026. Its fundamental design decision is different from every other GUI client: collections are stored as plain text files in a folder on your filesystem, not in a cloud database or some opaque binary format.

That means your API collections live in your git repository. Version control, code review, branching, and diffing work exactly as they do for the rest of your code. When you change an API request, the diff is human-readable.

# Bruno collection file format example
meta {
  name: Get User
  type: http
  seq: 1
}

get {
  url: {{baseUrl}}/users/{{userId}}
  body: none
  auth: bearer
}

auth:bearer {
  token: {{authToken}}
}

Bruno is free and open source. No cloud sync (by design), no account requirement, no paid tier. The limitation is exactly that: no built-in team sharing beyond “commit and push.” For teams already living in git, that’s a non-issue.

Best for: Dev teams who want API collections versioned with code, developers who’ve moved away from Postman for cost or philosophical reasons.

HTTPie

HTTPie is a command-line HTTP client built for readability. It’s not curl with flags — it’s a purpose-built tool for making HTTP requests in a way you can actually read without consulting documentation every time.

# HTTPie
http GET api.example.com/users Authorization:"Bearer $TOKEN"
http POST api.example.com/users name="Jane" email="jane@example.com"

# vs curl
curl -H "Authorization: Bearer $TOKEN" https://api.example.com/users
curl -X POST -H "Content-Type: application/json" \
  -d '{"name":"Jane","email":"jane@example.com"}' \
  https://api.example.com/users

HTTPie has a desktop GUI and a web client too, but the CLI is the core product and the reason most developers reach for it.

Pricing: CLI is free and open source. HTTPie Cloud (sync and team features) starts at $5/month.

Best for: Developers who live in the terminal, scripting API interactions in shell scripts, quick one-off requests during development.

curl

curl needs no introduction. It’s available everywhere, documented thoroughly, and its output is predictable for scripting. The syntax is hostile for interactive use — nobody enjoys writing curl commands by hand — but it’s perfect for CI/CD pipelines and scripts where you need zero dependencies.

curl -s -o /dev/null -w "%{http_code}" https://api.example.com/health

Nobody chooses curl as their primary development API client when alternatives exist. It’s the baseline you fall back on in environments where you can’t install anything else.

Side-by-Side Comparison

The Bottom Line

Bruno is the right call for dev teams who want API collections treated like code — versioned, diffed, and reviewed in pull requests. Postman is still the answer when you need enterprise features, monitoring, and mock servers. HTTPie wins for the terminal-native developer making quick requests. If you’re comparing Insomnia to Bruno, look at Bruno first — the file-based model is increasingly just the right default.