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Comparison of API simulation tools

From EverybodyWiki Bios & Wiki

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 Free Supported protocols and APIs Has a GUI Scriptable/Programmable
Docker support
Cloud offering
API Simulator No; Proprietary[4] Yes HTTP/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 Yes; GPL v3.0[9] Yes HTTP(S); STOMP, WSDL; Swagger; OpenAPI; Cobol Yes[10] Yes[11] Yes[12] No
Beeceptor No; Proprietary[13] Yes (Free plan) HTTP1.1; HTTP2; HTTP(S); SOAP, MITM/Proxing; Swagger; OpenAPI; TLS 1.2; XML; Local tunneling Yes Yes[14] Yes Yes
Camouflage Yes; MIT[15] Yes HTTP(S), HTTP/2 gRPC, Websockets, Thrift Yes[16] Yes[17] Yes[18] No
Charles Proxy No; Proprietary[19] No HTTP(S) Yes No No No
Ekko Proxy No; Proprietary Yes (non commercial use)[20] HTTP(S), JDBC; WSDL, Swagger, OpenApi, JWT. Yes[21] Yes (Scriptable) Yes No
HAM Yes; MIT Yes HTTP(S), SOAP, MITM/Proxing, Swagger, XML, JSON, Jackson-Smile, Brotli, Record, Replay, Automatic tests, Schema verification, JDBC, MongoDb Yes (Web) Yes (Dynamic Javascript and Java Plugins) Yes No
Hoverfly Yes; Apache 2[22] Yes HTTP(S) Yes Yes Yes Yes [23]
HTTP Toolkit Yes; AGPL[24] Yes (Hobbyist Edition)[25] HTTP(S) Yes No No No
Int4 IFTT No; Proprietary No HTTP(S), Middleware virtualization: SAP Process Orchestration, SAP Intelligent Suite, Dell Boomi, Software AG Webmethods, SAP IDOCs Yes Yes No No
Karate Yes; MIT[26] Yes HTTP(S), Java interop[27] No Yes[27] No No
Keploy Yes Yes HTTP(S), OpenAPI, gRPC Yes Yes Yes Yes
LogDog No; Proprietary[28] No HTTP(S), HTML, XML, JSON, Replay, Real-Time-Monitoring, 1-Click-Mocks Yes Yes No Yes
Microcks Yes; Apache 2[29] Yes HTTP(S), SOAP, gRPC, GraphQL, AsyncAPI[30] Yes Yes Yes No
Mockadillo No; Proprietary No HTTP(S)[31] Yes Yes No Yes
Mocklets No; Proprietary[32] Yes HTTP(S) Yes No No Yes [33]
Mockoon Yes; MIT[34] Yes HTTP(S)[35] Yes Yes Yes [36] No
MockServer Yes; Apache 2[37] Yes HTTP(S) Yes[38] Yes Yes No
mock.qa No; Proprietary Yes (Free plan)[39] gRPC, gRPC-web, HTTP/1.x, HTTP/2[40] Yes[41] (Web) Yes[42][43] (Scripting language,[44] Request matching,[45] Response templating,[46] Data generation,[47] Stateful scenarios[48]) No Yes
Mountebank Yes; MIT[49] Yes HTTP(S), TCP, SMTP[50] No Yes[51] Yes[52] No
NetOcean No; Proprietary No Web 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

Yes Yes Yes Yes
Parasoft Virtualize No; Proprietary Yes (Community Edition)[53] AMQP, FIX, FTP, HTTP(S), ISO 8583, JMS,
JDBC, MQ, MQTT, .NET WCF, RabbitMQ, SAP, TCP/IP, etc.[54]		 Yes Yes Yes[55] Yes
Postman No; Proprietary Yes (Free Edition)[56] HTTP(S) Yes Yes (JSON Examples) No Yes
ProxyMan No; Proprietary Yes,[57] (Limited) HTTP(S), Websockets Yes Yes[58] No No
QuickMocker No; Proprietary Yes (Free Subscription)[59] HTTP(S) Yes Yes[60] No Yes
Rapidmock No; Proprietary[61] Yes (Free Edition) HTTP(S) Yes No No Yes
Requestly Yes; GPL v3.0[62] Yes[63] HTTP(S) Yes Yes No Yes[64]
sMockin Yes; Apache 2[65] Yes HTTP, Websockets, Server Side Events, plus tools for real time monitoring & live response modification Yes Yes Yes No
Smocker Yes; MIT[66] Yes HTTP(S)[67] Yes Yes Yes No
SmartMock.io No; Proprietary[68] Yes [69] HTTP(S) Yes Yes No Yes
Specmatic Yes; MIT[70] Yes (Basic Plan) [71] HTTP(S), Swagger, OpenAPI, WSDL, Kafka, AsyncAPI, GraphQL, gRPC, Arazzo, Protobuf, JDBC, Redis, JMS, Google Pub/Sub [72] Yes [73] Yes Yes Yes
simulado Yes; MIT[74] Yes HTTP(S) No Yes Yes Yes
SoapUI MockServer Yes; EUPL[75] Yes HTTP(S)[76] Yes[76] No[76] No[76] No[76]
Speedscale No; Proprietary Yes, (Free Trial)[77] HTTP(S), gRPC, GraphQL webservices, Message queues, OSS Databases[78] Yes No, Not required. Traffic recording-based[79] Yes Yes
Stoplight Yes; Apache 2[80] Yes (Free Edition)[81] HTTP(S) and generate mocks directly from OpenAPI Yes Yes Yes Yes
TPM-Proxy Yes; MIT Yes Direct Wire Protocol implementation: HTTP(S), SOAP, MITM/Proxing, OpenAPI, XML, JSON, Jackson-Smile, Brotli, MongoDb, Postgres, MySQL, AMQP 091, MQTT, REDIS, Record, Replay, Modify Yes Yes (Java Plugins) Yes No
tweak No; Proprietary Yes HTTP(S) Yes No No No
Tricentis API Simulation No; Proprietary Yes(Free Edition)[82] Http(s), AmazonSqs, AMQP, AzureServiceBus, Files, IbmMQ, Kafka, RabbitMQ, Solace Yes [82] Yes [82] Yes [83] Yes [82]
Wilma Yes; GPL v3.0[84] Yes [85] HTTP(S) Yes Yes Yes [86] No
WireMock Yes; Apache 2[87] Yes HTTP(S), gRPC, GraphQL Yes Yes Yes Yes [88]
WireMock.Net Yes; Apache 2[89] Yes HTTP(S) No Yes Yes [90][91] No
Wiresham Yes; Apache 2[92] Yes TCP No Yes No No

See also

  • Test double
  • Service virtualization

References

  1. ↑ 1.0 1.1 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 License
  10. ↑ The apiUi GUI
  11. ↑ apiUi Scripting; adding dynamics
  12. ↑ apiUi Docker
  13. ↑ Beeceptor pricing
  14. ↑ Handlebar templates for scripting; adding dynamic responses
  15. ↑ Camouflage License
  16. ↑ "Camouflage UI". Archived from the original on 2021-05-22. Retrieved 2021-05-22. Unknown parameter |url-status= ignored (help)
  17. ↑ Scripting in Camouflage
  18. ↑ Camouflage Docker
  19. ↑ Charles Proxy EULA
  20. ↑ Ekko Proxy License Agreement
  21. ↑ Ekko Proxy Usage
  22. ↑ Hoverfly license
  23. ↑ Hoverfly Cloud
  24. ↑ HTTP Toolkit license
  25. ↑ HTTP Toolkit tiers
  26. ↑ Karate license
  27. ↑ 27.0 27.1 Karate-Netty home page
  28. ↑ LogDog
  29. ↑ Microcks License
  30. ↑ Using Microcks[permanent dead link]
  31. ↑ "Mockadillo". Mockadillo Homepage.
  32. ↑ Mocklets Terms of Use
  33. ↑ Mocklets
  34. ↑ Mockoon license
  35. ↑ "Mockoon". Mockoon features page.
  36. ↑ Mockoon CLI dockerhub
  37. ↑ MockServer License
  38. ↑ MockServer Dashboard
  39. ↑ Mock.qa: Free plan on GitHub Markeplace
  40. ↑ "Mock.qa: Supported protocols". Archived from the original on 2024-03-02. Retrieved 2025-08-21.
  41. ↑ "Mock.qa: Playground". Archived from the original on 2024-04-19. Retrieved 2025-08-21.
  42. ↑ "Mock.qa: Configuration". Archived from the original on 2023-10-01. Retrieved 2025-08-21.
  43. ↑ Mock.qa: Configuration examples[permanent dead link]
  44. ↑ "Mock.qa: Scripting language". Archived from the original on 2023-12-10. Retrieved 2025-08-21.
  45. ↑ "Mock.qa: Request matching". Archived from the original on 2023-10-19. Retrieved 2025-08-21.
  46. ↑ "Mock.qa: Response templating". Archived from the original on 2023-12-10. Retrieved 2025-08-21.
  47. ↑ "Mock.qa: Data generation". Archived from the original on 2023-12-10. Retrieved 2025-08-21.
  48. ↑ "Mock.qa: Stateful scenarios". Archived from the original on 2023-12-10. Retrieved 2025-08-21.
  49. ↑ Mountebank license
  50. ↑ Moutebank home page[Usurped!]
  51. ↑ Mountebank injection[Usurped!]
  52. ↑ Running Mountebank in Docker
  53. ↑ Parasoft Virtualize Community Edition
  54. ↑ Parasoft Virtualize home page
  55. ↑ Virtualize Docker Files 1.0
  56. ↑ Postman Pricing
  57. ↑ Proxyman Pricing
  58. ↑ Proxyman scripting
  59. ↑ "QuickMocker Pricing". Archived from the original on 2021-08-02. Retrieved 2025-08-21.
  60. ↑ "QuickMocker RegExp & Shortcodes". Archived from the original on 2024-12-02. Retrieved 2025-08-21.
  61. ↑ Rapidmock home page
  62. ↑ "requestly/requestly". GitHub.
  63. ↑ Requestly Pricing
  64. ↑ Requestly Clound Based Mock Server
  65. ↑ "Matthewgallina/Smockin". GitHub. 27 March 2022.
  66. ↑ Smocker License
  67. ↑ "Smocker documentation". Archived from the original on 2024-02-23. Retrieved 2025-08-21.
  68. ↑ SmartMock.io Terms of Use
  69. ↑ SmartMock.io pricing
  70. ↑ "Specmatic". GitHub.
  71. ↑ "Pricing - Specmatic".
  72. ↑ [1]
  73. ↑ Specmatic Studio
  74. ↑ simulado license
  75. ↑ SoapUI Licence
  76. ↑ 76.0 76.1 76.2 76.3 76.4 SoapUI MockServer documentation
  77. ↑ "Speedscale Free Trial Version". Speedscale. Retrieved 2024-03-20.
  78. ↑ "Technology Support | Speedscale Docs". docs.speedscale.com. Retrieved 2024-03-20.
  79. ↑ "How Traffic Recording Works". Speedscale. Retrieved 2024-03-20.
  80. ↑ Prism Licence
  81. ↑ Stoplight Pricing
  82. ↑ "Simulate services".
  83. ↑ Wilma License
  84. ↑ Wilma Feature list
  85. ↑ Docker images of Wilma
  86. ↑ WireMock License
  87. ↑ WireMock Cloud
  88. ↑ WireMock.Net License
  89. ↑ WireMock.Net .Net Core 2.0 Linux image
  90. ↑ WireMock.Net .Net Core 2.0 windows-nano image
  91. ↑ Wiresham License


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