Karate vs SoapUI / ReadyAPI

Free tier available

Free tier available

Open source core; Karate Labs sells a commercial IDE and enterprise support separately.

SmartBear publishes no ReadyAPI price; the pricing page is a quote request. ReadyAPI is licensed per module — Test, Performance, Virtualization — and buying all three multiplies the cost, with floating licences for CI costing more than fixed seats.

The open-source framework is complete and free.

SoapUI open source is free and covers SOAP and REST functional testing.

Widely used

Karate Labs · since 2017

Widely used

SmartBear · since 2005

• One DSL covers functional API tests, mocks and load tests — rare consolidation.
• Powerful JSON matching that removes most assertion boilerplate.
• Non-Java testers can write meaningful tests.

• Unmatched SOAP, WSDL and JMS support for legacy enterprise integration work.
• ReadyAPI bundles functional, security, load and virtualisation in one product family.
• Groovy scripting escape hatch for anything the GUI cannot express.

• The custom DSL is another language to learn and cannot be refactored by an IDE.
• Debugging complex scenarios is harder than in plain code.
• The UI automation feature is far behind dedicated browser tools.

• Dated Java desktop UI that feels heavy next to modern clients.
• Project files are XML and merge badly in version control.
• Modular licensing gets expensive fast.

Teams wanting API testing and mocking in one tool, including non-Java testers.

Enterprises testing SOAP services, message queues and legacy integration layers.