Citrus
Citrus: A broad, Java-centered framework for testing APIs, messages, contracts, and service integrations. Ranked #14 of 33 in API Testing Tools by our editors (7.8/10); pricing: Free plan; best for java teams testing service ecosystems and integrations.
At a glance
- Editor score7.8 / 10
- PricingFree plan
- Best forJava teams testing service ecosystems and integrations
- Free planYes
- Paid fromFree
- Founded2006
- Facts checked21 Sep 2026
Where it wins
- Supports HTTP, SOAP, Kafka, JMS, FTP/SFTP, SQL, SSH, Docker, and Kubernetes
- Validates JSON, XML, YAML, plaintext, schemas, XPath, and JsonPath
- Offers partner simulation, contract testing, and Java, XML, YAML, or Cucumber authoring
Where it doesn't
- Self-hosted deployment requires teams to manage the testing environment
- Its Java-centered runtimes may not suit teams seeking a language-neutral tool
- The broad integration surface may exceed the needs of simple HTTP-only testing
Our verdict on Citrus
Citrus is an open-source Java framework for automated integration testing across messaging applications, microservices, and enterprise systems. It is designed for development and test teams that need to send and receive messages, simulate client and server endpoints, validate headers and bodies, and test service integrations across HTTP REST, SOAP, Kafka, JMS, TCP/IP, FTP, and other transports. Tests can be authored in Java, XML, YAML, or Cucumber and run with JUnit Jupiter, Maven, Gradle, Spring Boot, Quarkus, or Cucumber.
The published pricing model is free of charge under the Apache License 2.0. That makes Citrus a practical option for teams that want an open-source framework rather than a metered hosted testing service or commercial plan structure. The tradeoff is deployment: Citrus is self-hosted, so teams need to provide and maintain the environment in which tests run. Java-oriented projects will have the clearest fit, especially when existing build and test workflows already use Maven, Gradle, Spring Boot, Quarkus, or JUnit Jupiter.
Citrus stands out for breadth in integration and message validation. It combines HTTP and SOAP clients and servers with interface-partner simulation, OpenAPI-based message generation, contract-driven testing, and validation for JSON, XML, YAML, plaintext, schemas, XPath, and JsonPath. Its ecosystem also includes Cucumber, Apache Camel, Testcontainers, Docker, Kubernetes, Apache Kafka, JMS, and SQL-related integrations. Choose Citrus when service ecosystems, message-based workflows, or third-party simulations are central to the testing strategy. Teams focused only on straightforward HTTP endpoint checks may prefer a narrower tool with less infrastructure and integration scope.
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Citrus pricing
Citrus fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| GraphQL support | Not verified |
| SOAP support | Yes |
| Scheduled runs | Not verified |
| CI/CD integration | Yes |
| Mock server | Yes |
| Contract testing | Yes |
| Included requests | Not verified |
| Deployment | Self-hosted |
| Support | Community, Docs |
| Built for | Mid-market, Enterprise (editorial estimate) |
| Integrations | 16 integrations: JUnit 5, JUnit 4, TestNG, Cucumber, Maven, Gradle … See all → |
| Pricing | Free plan |
| Website | citrusframework.org |
| Facts checked | 21 Sep 2026 |
Citrus integrations
Citrus lists 16 integrations on its own site.
- JUnit 5
- JUnit 4
- TestNG
- Cucumber
- Maven
- Gradle
- Quarkus
- Spring Boot
- Apache Camel
- Kafka
- JMS
- Docker
- Kubernetes
- Testcontainers
- Selenium
- OpenAPI
Alternatives to Citrus
- PostmanA mature API test platform with broad protocol support and a wide feature set.9.3
- ApidogA broad API toolkit for teams that need design, testing, automation, and documentation together.9.2
- SoapUIA broad, free API testing desktop tool for functional, contract, performance, and load work.9.0
Also Ranked In
Citrus is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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