Top 9 Developer Tools in API Testing

The best Developer Tools within the API Testing category - based on our collection of reviews & verified products.

Product categories

API Observability API Testing API Tools APIs Automated Testing Browser Testing Developer APIs Developer Tools Realtime Backend / API Tech Web Service Automation Website Testing

Summary

The top products on this list are Postman, Swagger UI, and Thunder Client. All products here are categorized as: We recommend LibHunt for [discovery and comparisons of open-source projects](https://www.libhunt.com/). API Testing. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Postman Landing Page
1

Postman

The Collaboration Platform for API Development
Pricing:
- Open Source
#API Tools #Developer Tools #APIs 30 social mentions
Swagger UI Landing Page

2

Swagger UI

Swagger UI is a dependency-free collection of HTML, Javascript, and CSS assets that dynamically generate beautiful documentation from a Swag

#API Tools #Web Service Automation #Developer Tools 50 social mentions
Thunder Client Landing Page

3

Thunder Client

Rest API client for VS Code, lightweight Postman alternative

#API Tools #Project Management #Developer Tools
Treblle Landing Page
4

Treblle

End to End APIOps Platform
Pricing:
- Open Source
- Freemium
- Free Trial
- $25.0 / Monthly (For 1 Workspace, 1 API, 250,000 Requests / mo)
#API Tools #Error Tracking #Realtime Backend / API 28 social mentions
Katalon Landing Page

5

Katalon

Built on the top of Selenium and Appium, Katalon Studio is a free and powerful automated testing tool for web testing, mobile testing, and API testing.

#Automated Testing #Website Testing #Software Testing 9 social mentions
Ping-API Landing Page

6

Ping-API

Automated API testing and monitoring.

#API Tools #Developer Tools #Tech
TestMace Landing Page

7

TestMace

Powerful IDE to work with API.

#API Tools #Developer Tools #Tech
Firecamp Landing Page
8

Firecamp

Firecamp is a modern client for Real-time, GraphQL, REST and other 15+ routine tech stacks and platforms.
Pricing:
- Open Source
#API Tools #Realtime Backend / API #Developer Tools 5 social mentions
KushoAI Landing Page
9

KushoAI

AI agent to understand, write & execute tests for APIs in minutes
Pricing:
- Freemium
- Free Trial
#Productivity #API Tools #AI 1 social mentions

Recent Developer Tools Posts

Best Postman Alternatives To Consider in 2025

hypertest.co // over 1 year ago

Postman Alternatives for API Testing and Monitoring

blazemeter.com // over 1 year ago

Top 20 Open Source & Cloud Free Postman Alternatives (2024 Updated)

medium.com // about 1 year ago

15 BEST SoapUI Alternatives (2022 Update)

guru99.com // about 3 years ago

15 Best Postman Alternatives for Automated API Testing [2022 Updated]

testsigma.com // about 3 years ago

Related categories

🔍 API Tools 💻 APIs 💻 Tech 📂 Developer APIs ⚡ Realtime Backend / API

Recently added products

Rest Console Airborne Mambo HooksEasy Qodex.ai Scandium REST-Assured vREST Testfully Depicter

If you want to make changes on any of the products, you can go to its page and click on the "Suggest Changes" link. Alternatively, if you are working on one of these products, it's best to verify it and make the changes directly through the management page. Thanks!