Comparison of API simulation tools

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The tools listed here support emulating [1] or simulating APIs and software systems. They are also called [2] API mocking tools, service virtualization tools, over the wire test doubles and tools for stubbing and mocking HTTP(S) and other protocols. [1] They enable component testing in isolation. [3]

In alphabetical order by name (click on a column heading to sort by that column):

Name FOSS FreeSupported protocols and APIsHas a GUI Scriptable/Programmable Docker supportCloud offering
API SimulatorNo; Proprietary [4] YesHTTP/2 with TLS ALPN; HTTP/2 with prior knowledge; HTTP/2 upgrade from HTTP/1.1; HTTP/1.x with and without TLS/SSL; HTTP(S)Yes [5] Yes [6] [7] Yes [8] No
apiUi [9] Yes; GPL v3.0 [10] YesHTTP(S); STOMP, WSDL; Swagger; OpenAPI; CobolYes [11] Yes [12] Yes [13] No
Beeceptor [14] No; Proprietary [15] Yes (Free plan)HTTP1.1; HTTP2; HTTP(S); SOAP, MITM/Proxing; Swagger; OpenAPI; TLS 1.2; XML; Local tunnelingYesYes [16] NoYes
CamouflageYes; MIT [17] YesHTTP(S), HTTP/2 gRPC, Websockets, ThriftYes [18] Yes [19] Yes [20] No
Castle MockYes; Apache 2 [21] YesHTTP(S)YesYesYesNo
Charles ProxyNo; Proprietary [22] NoHTTP(S)YesNoNoNo
Ekko ProxyNo; ProprietaryYes (non commercial use) [23] HTTP(S), JDBC; WSDL, Swagger, OpenApi, JWT.Yes [24] Yes (Scriptable)YesNo
HAM Yes; MITYesHTTP(S), SOAP, MITM/Proxing, Swagger, XML, JSON, Jackson-Smile, Brotli, Record, Replay, Automatic tests, Schema verification, JDBC, MongoDbYes (Web)Yes (Dynamic Javascript and Java Plugins)YesNo
Hoverfly Yes; Apache 2 [25] YesHTTP(S)YesYesYesYes [26]
HTTP ToolkitYes; AGPL [27] Yes (Hobbyist Edition) [28] HTTP(S)YesNoNoNo
Int4 IFTTNo; ProprietaryNoHTTP(S), Middleware virtualization: SAP Process Orchestration, SAP Intelligent Suite, Dell Boomi, Software AG Webmethods, SAP IDOCsYesYesNoNo
KarateYes; MIT [29] YesHTTP(S), Java interop [30] NoYes [30] NoNo
Microcks Yes; Apache 2 [31] YesHTTP(S), SOAP, gRPC, GraphQL, AsyncAPI [32] YesYesYesNo
MockadilloNo; ProprietaryNoHTTP(S) [33] YesYesNoYes
MockletsNo; Proprietary [34] YesHTTP(S)YesNoNoYes [35]
Mockoon Yes; MIT [36] YesHTTP(S) [37] YesYesYes [38] No
MockServerYes; Apache 2 [39] YesHTTP(S)Yes [40] YesYesNo
mock.qa No; ProprietaryYes (Free plan) [41] gRPC, gRPC-web, HTTP/1.x, HTTP/2 [42] Yes [43] (Web)Yes [44] [45] (Scripting language, [46] Request matching, [47] Response templating, [48] Data generation, [49] Stateful scenarios [50] )NoYes
MountebankYes; MIT [51] YesHTTP(S), TCP, SMTP [52] NoYes [53] Yes [54] No
NetOcean No; ProprietaryNoWeb Services Protocols: HTTP, HTTPS, HTTP2, REST, SOAP, Hessian

Others: IMAP, FTP, DNS, XML, JSON, WebSocket

ESB / Middleware Protocols, TIBCO JMS

Database Protocols: JDBC

Proprietary: TCP, UDP

Platforms: TIBCO-EMS, IBM-MQ, Kafka

SOA Protocols: SOAP, HTTP, XML, REST

SMS Gateway Providers: SMTP, POP3

Bill Payments Services: Gift card- PINPAD, AJB

YesYesYesYes
Parasoft Virtualize No; ProprietaryYes (Community Edition) [55] AMQP, FIX, FTP, HTTP(S), ISO 8583, JMS,
JDBC, MQ, MQTT, .NET WCF, RabbitMQ, SAP, TCP/IP, etc. [56] 		YesYesYes [57] Yes
Postman No; ProprietaryYes (Free Edition) [58] HTTP(S)YesYes (JSON Examples)NoYes
ProxyMan No; ProprietaryYes, [59] (Limited)HTTP(S), WebsocketsYesYes [60] NoNo
QuickMockerNo; ProprietaryYes (Free Subscription) [61] HTTP(S)YesYes [62] NoYes
RapidmockNo; Proprietary [63] Yes (Free Edition)HTTP(S)YesNoNoYes
Requestly Yes; GPL v3.0 [64] Yes [65] HTTP(S)YesYesNoYes [66]
sMockinYes; Apache 2 [67] YesHTTP, Websockets, Server Side Events, plus tools for real time monitoring & live response modificationYesYesYesNo
SmockerYes; MIT [68] YesHTTP(S) [69] YesYesYesNo
SmartMock.ioNo; Proprietary [70] Yes [71] HTTP(S)YesYesNoYes
specmatic.in Yes; MIT [72] YesHTTP(S), Swagger, OpenAPI, WSDL, Kafka (WIP)NoYesNoNo
simuladoYes; MIT [73] YesHTTP(S)NoYesYesYes
SoapUI MockServerYes; EUPL [74] YesHTTP(S) [75] Yes [75] No [75] No [75] No [75]
Speedscale No; ProprietaryYes, (Free Trial) [76] HTTP(S), gRPC, GraphQL webservices, Message queues, OSS Databases [77] YesNo, Not required. Traffic recording-based [78] YesYes
StoplightYes; Apache 2 [79] Yes (Free Edition) [80] HTTP(S) and generate mocks directly from OpenAPIYesYesYesYes
The Protocol Master Yes; MITYesDirect Wire Protocol implementation: HTTP(S), SOAP, MITM/Proxing, Swagger, XML, JSON, Jackson-Smile, Brotli, MongoDb, Postgres, MySQL, AMQP 091, MQTT, REDIS, Record, Replay, ModifyYes (Swagger)Yes (Java Plugins)YesNo
Traffic ParrotNo; Proprietary [81] No; [82] HTTP(S) including REST and SOAP

gRPC

JMS (ActiveMQ TCP, ActiveMQ AMQP 1.0, Azure AMQP 1.0, RabbitMQ AMQP 0.9.1, IBM® WebSphere MQ 7.5+)

Native IBM® WebSphere MQ 7.5+

Thrift

AMQP 1.0

File transfers over a filesystem

Amazon Simple Queue Service (SQS)

Azure Service Bus AMQP 1.0 [83]

In beta: [84] FIX, FAST, FIXatdl, SWIFT, MQTT, SonicMQ, Kafka, CORBA, FTP, SFTP, .NET WCF, RMI, MTP, TIBCO EMS, CICS, SAP RFC, JDBC, Mongo, Databases, OFX, IFX, RIXML, AS2, Amazon Simple Notification Service (SNS), AWS IoT Message Broker, XMPP, Google Cloud Messaging (GCM), Azure Event Grid, Azure Event Hubs, STOMP, Avro, HTTP/2 (HTTP2), LWM2M, CoAP (Constrained Application Protocol), ZeroMQ, Broker-J (BrokerJ), Qpid, QUIC and gQUIC (Google QUIC)

Yes [81] Yes [85] Yes [81] Yes [86] [81]
tweakNo; ProprietaryYesHTTP(S)YesNoNoNo
Tricentis API SimulationNo; ProprietaryYes(Free Edition) [87] Http(s), AmazonSqs, AMQP, AzureServiceBus, Files, IbmMQ, Kafka, RabbitMQ, SolaceYes [87] Yes [87] Yes [88] Yes [87]
WilmaYes; GPL v3.0 [89] Yes [90] HTTP(S)YesYesYes [91] No
WireMockYes; Apache 2 [92] YesHTTP(S), gRPC, GraphQLYesYesYesYes [93]
WireMock.NetYes; Apache 2 [94] YesHTTP(S)NoYesYes [95] [96] No
WireshamYes; Apache 2 [97] YesTCPNoYesNoNo

See also

References

  1. 1 2 Thought Works Technology Radar Mountebank
  2. ↑ Tom Akehurst at the Next Gen Service Virtualisation Forum
  3. ↑ Martin Fowler, Microservce Testing, Component Testing
  4. ↑ API Simulator License Agreement
  5. ↑ API Simulation Modeler
  6. ↑ Scripting in API Simulator
  7. ↑ Simula Template Scriptlets
  8. ↑ API Simulator in Docker Container
  9. ↑ apiUi how to mock api calls? how to test api calls?
  10. ↑ apiUi License
  11. ↑ The apiUi GUI
  12. ↑ apiUi Scripting; adding dynamics
  13. ↑ apiUi Docker
  14. ↑ Beeceptor eases API development and testing by allowing mocking, intercepting and MITM proxies
  15. ↑ Beeceptor pricing
  16. ↑ Handlebar templates for scripting; adding dynamic responses
  17. ↑ Camouflage License
  18. ↑ Camouflage UI
  19. ↑ Scripting in Camouflage
  20. ↑ Camouflage Docker
  21. ↑ Castle Mock License
  22. ↑ Charles Proxy EULA
  23. ↑ Ekko Proxy License Agreement
  24. ↑ Ekko Proxy Usage
  25. ↑ Hoverfly license
  26. ↑ Hoverfly Cloud
  27. ↑ HTTP Toolkit license
  28. ↑ HTTP Toolkit tiers
  29. ↑ Karate license
  30. 1 2 Karate-Netty home page
  31. ↑ Microcks License
  32. ↑ Using Microcks
  33. ↑ "Mockadillo". Mockadillo Homepage.
  34. ↑ Mocklets Terms of Use
  35. ↑ Mocklets
  36. ↑ Mockoon license
  37. ↑ "Mockoon". Mockoon features page.
  38. ↑ Mockoon CLI dockerhub
  39. ↑ MockServer License
  40. ↑ MockServer Dashboard
  41. ↑ Mock.qa: Free plan on GitHub Markeplace
  42. ↑ Mock.qa: Supported protocols
  43. ↑ Mock.qa: Playground
  44. ↑ Mock.qa: Configuration
  45. ↑ Mock.qa: Configuration examples
  46. ↑ Mock.qa: Scripting language
  47. ↑ Mock.qa: Request matching
  48. ↑ Mock.qa: Response templating
  49. ↑ Mock.qa: Data generation
  50. ↑ Mock.qa: Stateful scenarios
  51. ↑ Mountebank license
  52. ↑ Moutebank home page
  53. ↑ Mountebank injection
  54. ↑ Running Mountebank in Docker
  55. ↑ Parasoft Virtualize Community Edition
  56. ↑ Parasoft Virtualize home page
  57. ↑ Virtualize Docker Files 1.0
  58. ↑ Postman Pricing
  59. ↑ Proxyman Pricing
  60. ↑ Proxyman scripting
  61. ↑ QuickMocker Pricing
  62. ↑ QuickMocker RegExp & Shortcodes
  63. ↑ Rapidmock home page
  64. ↑ "requestly/requestly". GitHub .
  65. ↑ Requestly Pricing
  66. ↑ Requestly Clound Based Mock Server
  67. ↑ "Matthewgallina/Smockin". GitHub . 27 March 2022.
  68. ↑ Smocker License
  69. ↑ Smocker documentation
  70. ↑ SmartMock.io Terms of Use
  71. ↑ SmartMock.io pricing
  72. ↑ "Specmatic". GitHub .
  73. ↑ simulado license
  74. ↑ SoapUI Licence
  75. 1 2 3 4 5 SoapUI MockServer documentation
  76. ↑ "Speedscale Free Trial Version". Speedscale. Retrieved 2024-03-20.
  77. ↑ "Technology Support | Speedscale Docs". docs.speedscale.com. Retrieved 2024-03-20.
  78. ↑ "How Traffic Recording Works". Speedscale. Retrieved 2024-03-20.
  79. ↑ Prism Licence
  80. ↑ Stoplight Pricing
  81. 1 2 3 4 Traffic Parrot home page
  82. ↑ Traffic Parrot pricing
  83. ↑ Traffic Parrot data sheet
  84. ↑ Traffic Parrot list of beta features
  85. ↑ Traffic Parrot Dynamic Responses Documentation
  86. ↑ Traffic Parrot is compatible with Docker, Kubernetes and Openshift
  87. ↑ https://documentation.tricentis.com/tricentis_cloud/en/content/topics/sim_get_started.htm
  88. ↑ Wilma License
  89. ↑ Wilma Feature list
  90. ↑ Docker images of Wilma
  91. ↑ WireMock License
  92. ↑ WireMock Cloud
  93. ↑ WireMock.Net License
  94. ↑ WireMock.Net .Net Core 2.0 Linux image
  95. ↑ WireMock.Net .Net Core 2.0 windows-nano image
  96. ↑ Wiresham License
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