What are the best tools for API testing?
Asked "What are the best tools for API testing?", Perplexity, Gemini, Google AI Mode, ChatGPT and Copilot named 36 distinct tools across 10 answers on September 8, 2026, and 19 of them in two or more answers.
19 of 36 names confirmed · named in 2 or more of 10 answers · asked September 8, 2026 · 5 engines
The best tools for API testing include Postman, Insomnia, and SoapUI, each excelling in different areas such as collaboration, speed, protocol support, and enterprise readiness. The choice of tool depends on the specific needs of the project, such as manual API exploration, automated regression tests, load testing, security testing, or enterprise workflows. Postman is a comprehensive tool covering design, mocking, testing, and monitoring, while Insomnia is a lightweight alternative with strong support for REST, GraphQL, and gRPC.
- 1Postmannamed in 9 of 10 answers
- 2Hoppscotchnamed in 9 of 10 answers
- 3REST Assurednamed in 9 of 10 answers
- 4Brunonamed in 8 of 10 answers
- 5Insomnianamed in 7 of 10 answers
- 6Apache JMeternamed in 6 of 10 answers
- 7SoapUInamed in 5 of 10 answers
- 8Playwrightnamed in 5 of 10 answers
- 9HTTPienamed in 5 of 10 answers
- 10k6named in 5 of 10 answers
- 11Karatenamed in 4 of 10 answers
- 12SoapUI/ReadyAPInamed in 3 of 10 answers
- 13ReadyAPInamed in 3 of 10 answers
- 14Katalon Studionamed in 3 of 10 answers
- 15Cypressnamed in 2 of 10 answers
- 16Karate DSLnamed in 2 of 10 answers
- 17PyTestnamed in 2 of 10 answers
- 18Thunder Clientnamed in 2 of 10 answers
- 19Assertiblenamed in 2 of 10 answers
- 20JMeternamed in 1 of 10 answersone answer
- 21Pactnamed in 1 of 10 answersone answer
- 22SuperTestnamed in 1 of 10 answersone answer
- 23k6 by Grafananamed in 1 of 10 answersone answer
- 24Taikonamed in 1 of 10 answersone answer
- 25Gatlingnamed in 1 of 10 answersone answer
The full measurement
- The position each of the 5 engines gave all 36 names.
- How many of the 10 answers named each of them.
- 187 sampled observations behind this ranking, and where the engines disagree.
- Fan-out — the query each engine actually searched.
- Every citation, and the sources nobody cited.