SoapUI / ReadyAPI vs REST Assured
Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
Free tier available
Free tierFree and open source
Open sourceWhat drives the bill
The metric that actually scales your invoice.
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.
Free and open source. You pay in engineering time and CI minutes.
Free tier
SoapUI open source is free and covers SOAP and REST functional testing.
Everything, self-hosted
Open source
EUPL-1.1 (SoapUI open source)
Apache-2.0
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
SmartBear · since 2005
Widely used
OSS community · since 2010
Strengths
- 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.
- API tests live in the codebase, versioned and reviewed with the service.
- Readable given/when/then chains that map directly onto HTTP semantics.
- Full access to Java for setup, data and assertions.
Limitations
- 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.
- Java only, and requires developers rather than manual testers.
- No GUI, so exploratory request work needs a separate client.
- Verbose for very large payload assertions.
Best for
Enterprises testing SOAP services, message queues and legacy integration layers.
JVM teams that want API tests in the same repository as the service.
All of these integrate with: Maven.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.