What are the best alternatives to Postman for API testing?

Here are some of the best alternatives to Postman for API testing, depending on what you care about most:

1. Insomnia

Best for: A clean UI and strong REST/GraphQL support

• Easy to use and visually polished
• Good for REST, GraphQL, gRPC, and WebSockets
• Supports environments, variables, auth, and request chaining
• Great choice if you want something similar to Postman but lighter

2. Hoppscotch

Best for: Free, fast, web-based testing

• Open-source and browser-based
• Supports REST, GraphQL, WebSocket, and MQTT
• Very lightweight and easy to start with
• Great if you want a no-install option

3. Bruno

Best for: Local-first, Git-friendly API testing

• Stores collections as files in your repo
• Excellent for version control and team collaboration via Git
• Open-source and privacy-friendly
• Good if you want to keep API definitions alongside code

4. Swagger UI / OpenAPI tools

Best for: Testing APIs that already have an OpenAPI spec

• Helpful for exploring and trying endpoints documented in OpenAPI
• Great for documentation-driven workflows
• Not as full-featured as Postman for complex testing, but very useful

5. Thunder Client

Best for: VS Code users

• Lightweight extension inside VS Code
• Good for quick API requests without leaving your editor
• Supports collections, environments, and basic tests
• Best if you prefer an IDE-integrated workflow

6. cURL + HTTPie

Best for: Command-line users and automation

• cURL is universal and scriptable
• HTTPie is more human-friendly and readable than cURL
• Excellent for debugging and CI pipelines
• Best if you don’t need a GUI

7. Karate

Best for: API testing with automation and assertions

• Strong for test automation and behavior-driven testing
• Can test APIs, mocks, and even UI in some cases
• Good for teams needing more than manual exploration

8. SoapUI / ReadyAPI

Best for: SOAP APIs and enterprise testing

• Strong SOAP support, plus REST testing
• Powerful for complex enterprise scenarios
• ReadyAPI is commercial; SoapUI has a free version

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Quick recommendations

• Closest to Postman: Insomnia
• Best open-source web app: Hoppscotch
• Best for Git-based workflows: Bruno
• Best inside VS Code: Thunder Client
• Best for automation-heavy testing: Karate
• Best for SOAP: SoapUI

If you want, I can also give you:

1. a comparison table of these tools, or
2. the best option based on your use case (team collaboration, open-source, automation, GraphQL, etc.).