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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 | 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[28] | Yes | HTTP(S), OpenAPI, gRPC | Yes[29] | Yes | Yes[30] | Yes[31] |
| LogDog | No; Proprietary[32] | No | HTTP(S), HTML, XML, JSON, Replay, Real-Time-Monitoring, 1-Click-Mocks | Yes | Yes | No | Yes |
| Microcks | Yes; Apache 2[33] | Yes | HTTP(S), SOAP, gRPC, GraphQL, AsyncAPI[34] | Yes | Yes | Yes | No |
| Mockadillo | No; Proprietary | No | HTTP(S)[35] | Yes | Yes | No | Yes |
| Mocklets | No; Proprietary[36] | Yes | HTTP(S) | Yes | No | No | Yes [37] |
| Mockoon | Yes; MIT[38] | Yes | HTTP(S)[39] | Yes | Yes | Yes [40] | No |
| MockServer | Yes; Apache 2[41] | Yes | HTTP(S) | Yes[42] | Yes | Yes | No |
| mock.qa | No; Proprietary | Yes (Free plan)[43] | gRPC, gRPC-web, HTTP/1.x, HTTP/2[44] | Yes[45] (Web) | Yes[46][47] (Scripting language,[48] Request matching,[49] Response templating,[50] Data generation,[51] Stateful scenarios[52]) | No | Yes |
| Mountebank | Yes; MIT[53] | Yes | HTTP(S), TCP, SMTP[54] | No | Yes[55] | Yes[56] | 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)[57] | AMQP, FIX, FTP, HTTP(S), ISO 8583, JMS, JDBC, MQ, MQTT, .NET WCF, RabbitMQ, SAP, TCP/IP, etc.[58] |
Yes | Yes | Yes[59] | Yes |
| Postman | No; Proprietary | Yes (Free Edition)[60] | HTTP(S) | Yes | Yes (JSON Examples) | No | Yes |
| ProxyMan | No; Proprietary | Yes,[61] (Limited) | HTTP(S), Websockets | Yes | Yes[62] | No | No |
| QuickMocker | No; Proprietary | Yes (Free Subscription)[63] | HTTP(S) | Yes | Yes[64] | No | Yes |
| Rapidmock | No; Proprietary[65] | Yes (Free Edition) | HTTP(S) | Yes | No | No | Yes |
| Requestly | Yes; GPL v3.0[66] | Yes[67] | HTTP(S) | Yes | Yes | No | Yes[68] |
| sMockin | Yes; Apache 2[69] | Yes | HTTP, Websockets, Server Side Events, plus tools for real time monitoring & live response modification | Yes | Yes | Yes | No |
| Smocker | Yes; MIT[70] | Yes | HTTP(S)[71] | Yes | Yes | Yes | No |
| SmartMock.io | No; Proprietary[72] | Yes [73] | HTTP(S) | Yes | Yes | No | Yes |
| Specmatic | Yes; MIT[74] | Yes (Basic Plan) [75] | HTTP(S), Swagger, OpenAPI, WSDL, Kafka, AsyncAPI, GraphQL, gRPC, Arazzo, Protobuf, JDBC, Redis, JMS, Google Pub/Sub [76] | Yes [77] | Yes | Yes | Yes |
| simulado | Yes; MIT[78] | Yes | HTTP(S) | No | Yes | Yes | Yes |
| SoapUI MockServer | Yes; EUPL[79] | Yes | HTTP(S)[80] | Yes[80] | No[80] | No[80] | No[80] |
| Speedscale | No; Proprietary | Yes, (Free Trial)[81] | HTTP(S), gRPC, GraphQL webservices, Message queues, OSS Databases[82] | Yes | No, Not required. Traffic recording-based[83] | Yes | Yes |
| Stoplight | Yes; Apache 2[84] | Yes (Free Edition)[85] | 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)[86] | Http(s), AmazonSqs, AMQP, AzureServiceBus, Files, IbmMQ, Kafka, RabbitMQ, Solace | Yes [86] | Yes [86] | Yes [87] | Yes [86] |
| Wilma | Yes; GPL v3.0[88] | Yes [89] | HTTP(S) | Yes | Yes | Yes [90] | No |
| WireMock | Yes; Apache 2[91] | Yes | HTTP(S), gRPC, GraphQL | Yes | Yes | Yes | Yes [92] |
| WireMock.Net | Yes; Apache 2[93] | Yes | HTTP(S) | No | Yes | Yes [94][95] | No |
| Wiresham | Yes; Apache 2[96] | Yes | TCP | No | Yes | No | No |
See also
References
- ^ a b Thought Works Technology Radar Mountebank
- ^ Tom Akehurst at the Next Gen Service Virtualisation Forum
- ^ Martin Fowler, Microservce Testing, Component Testing
- ^ API Simulator License Agreement
- ^ API Simulation Modeler
- ^ Scripting in API Simulator
- ^ Simula Template Scriptlets
- ^ API Simulator in Docker Container
- ^ apiUi License
- ^ The apiUi GUI
- ^ apiUi Scripting; adding dynamics
- ^ apiUi Docker
- ^ Beeceptor pricing
- ^ Handlebar templates for scripting; adding dynamic responses
- ^ Camouflage License
- ^ Camouflage UI
- ^ Scripting in Camouflage
- ^ Camouflage Docker
- ^ Charles Proxy EULA
- ^ Ekko Proxy License Agreement
- ^ Ekko Proxy Usage
- ^ Hoverfly license
- ^ Hoverfly Cloud
- ^ HTTP Toolkit license
- ^ HTTP Toolkit tiers
- ^ Karate license
- ^ a b Karate-Netty home page
- ^ keploy License, Keploy Inc, 2025-08-20, retrieved 2025-08-20
- ^ "Keploy UI". app.keploy.io. Retrieved 2025-08-20.
- ^ "Keploy docker support". keploy.io. Retrieved 2025-08-20.
- ^ "Cloud offering's". keploy.io. Retrieved 2025-08-20.
- ^ LogDog
- ^ Microcks License
- ^ Using Microcks
- ^ "Mockadillo". Mockadillo Homepage.
- ^ Mocklets Terms of Use
- ^ Mocklets
- ^ Mockoon license
- ^ "Mockoon". Mockoon features page.
- ^ Mockoon CLI dockerhub
- ^ MockServer License
- ^ MockServer Dashboard
- ^ Mock.qa: Free plan on GitHub Markeplace
- ^ Mock.qa: Supported protocols
- ^ Mock.qa: Playground
- ^ Mock.qa: Configuration
- ^ Mock.qa: Configuration examples
- ^ Mock.qa: Scripting language
- ^ Mock.qa: Request matching
- ^ Mock.qa: Response templating
- ^ Mock.qa: Data generation
- ^ Mock.qa: Stateful scenarios
- ^ Mountebank license
- ^ Moutebank home page
- ^ Mountebank injection
- ^ Running Mountebank in Docker
- ^ Parasoft Virtualize Community Edition
- ^ Parasoft Virtualize home page
- ^ Virtualize Docker Files 1.0
- ^ Postman Pricing
- ^ Proxyman Pricing
- ^ Proxyman scripting
- ^ QuickMocker Pricing
- ^ QuickMocker RegExp & Shortcodes
- ^ Rapidmock home page
- ^ "requestly/requestly". GitHub.
- ^ Requestly Pricing
- ^ Requestly Clound Based Mock Server
- ^ "Matthewgallina/Smockin". GitHub. 27 March 2022.
- ^ Smocker License
- ^ Smocker documentation
- ^ SmartMock.io Terms of Use
- ^ SmartMock.io pricing
- ^ "Specmatic". GitHub.
- ^ [1]
- ^ [2]
- ^ Specmatic Studio
- ^ simulado license
- ^ SoapUI Licence
- ^ a b c d e SoapUI MockServer documentation
- ^ "Speedscale Free Trial Version". Speedscale. Retrieved 2024-03-20.
- ^ "Technology Support | Speedscale Docs". docs.speedscale.com. Retrieved 2024-03-20.
- ^ "How Traffic Recording Works". Speedscale. Retrieved 2024-03-20.
- ^ Prism Licence
- ^ Stoplight Pricing
- ^ a b c d https://www.tricentis.com/products/tricentis-test-automation
- ^ https://documentation.tricentis.com/tricentis_cloud/en/content/topics/sim_get_started.htm
- ^ Wilma License
- ^ Wilma Feature list
- ^ Docker images of Wilma
- ^ WireMock License
- ^ WireMock Cloud
- ^ WireMock.Net License
- ^ WireMock.Net .Net Core 2.0 Linux image
- ^ WireMock.Net .Net Core 2.0 windows-nano image
- ^ Wiresham License