01
Karate DSL
Unified API, UI and AI test automation
Karate DSL is an open-source testing engine for API, UI and performance scenarios.
96.0
Open-source API testing tools
10 ranked, with a plain verdict on every entry.
Karate DSL comes first on this list: it allows developers to write significantly less test code while running in any CI environment. Insomnia is built for API developers, and offers unlimited projects and collection runs on its free tier. BrowserStack serves QA and engineering teams scaling test automation, and integrates AI agents across the entire testing lifecycle.
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The ranking, in detail
02
Insomnia
An AI-native API collaboration platform with native Kong Konnect integration.
Insomnia is a collaborative API development platform supporting REST, GraphQL, gRPC, and WebSocket protocols. It enables developers to design, mock, test, and debug APIs with AI-native capabilities.
92.0
03
BrowserStack
Live browser testing and continuous testing platform
BrowserStack is a reliable platform for app and cross-browser testing. It enables teams to test websites and mobile apps on real devices.
90.0
04
Kong
Cloud-native API gateway and connectivity platform
Kong is an AI connectivity company offering a unified platform for API, AI, and event management. It enables organisations to secure, govern, and monetise traffic across diverse infrastructures.
90.0
05
Bruno
Open-source API client with Git-native workflows and local-first security.
Bruno is a Git-native API client designed for developers.
88.0
06
SoapUI
The simplest and easiest way to begin your API testing journey
SoapUI is the open source version of the most widely used API testing tool in the world.
88.0
07
Hoppscotch
Open source API development ecosystem
Hoppscotch is an open source API development ecosystem. It provides a comprehensive suite of tools for managing and testing APIs.
80.0
08
HTTPie
API testing client that flows with you
HTTPie simplifies API testing for developers building modern tools. The company aims to make APIs intuitive for all creators.
80.0
09
Cubenest
A nest for small, self-contained developer tools
Cubenest creates small, self-contained developer tools that are open source and independent. The company builds these utilities carefully to close the gap between prototype and usable product.
78.0
10
Rest-Assured
Simplifying REST service validation in Java
REST Assured simplifies testing and validating REST services in Java. It brings the simplicity of dynamic languages into the Java domain.
74.0
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Positions 1, 2 and 3 are available to buy for twelve months.
Frequently asked questions
What do the top four say they are built for?
Karate DSL says it is built for engineering teams modernising manual regression, and Insomnia for API developers. BrowserStack says it is built for QA and engineering teams scaling test automation, and Kong for Platform teams.
What should a buyer check before signing up?
Karate DSL states that the product requires a paid commercial licence for runtime execution of async protocol tests in CI/CD pipelines. Kong states that Kong charges extra fees for transaction volumes exceeding the included monthly limit. SoapUI states that SoapUI does not offer data driven testing capabilities. Those are the limits each product publishes itself, not a full account of any plan.