View source for Comparison of API simulation tools

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The tools listed here support [[Emulator|emulating]]<ref name=technologyradarmoutebank>[https://www.thoughtworks.com/radar/tools/mountebank Thought Works Technology Radar Mountebank]</ref> or [[Simulation|simulating]] [[Application programming interface|APIs]] and [[software system]]s. They are also called<ref>[https://www.youtube.com/watch?v=Lesn4L3k6HE Tom Akehurst at the Next Gen Service Virtualisation Forum]</ref> [[Application programming interface|API]] [[Mock object|mocking]] tools, [[service virtualization]] tools, over the wire [[test double]]s and tools for stubbing and mocking HTTP(S) and other protocols.<ref name=technologyradarmoutebank/> They enable component testing in isolation.<ref>[https://martinfowler.com/articles/microservice-testing/#testing-component-introduction Martin Fowler, Microservce Testing, Component Testing]</ref>

In alphabetical order by name (click on a column heading to sort by that column):
{{sort-under}}
{|  class="wikitable sortable sort-under"
! Name !! [[Free and open-source software|FOSS]] !! Free !! Supported protocols and APIs !! Has a [[Graphical user interface|GUI]] !! Scriptable/Programmable !! {{verth|va=middle|[[Docker (software)|Docker]] support}} !! {{verth|va=middle|Cloud offering}}
|-
| API Simulator || {{no}}; Proprietary<ref>[https://apisimulator.io/license-agreement/ API Simulator License Agreement]</ref> || {{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}}<ref>[https://apisimulator.io/doc/api-simulation-modeler/ API Simulation Modeler]</ref> || {{yes}}<ref>[https://apisimulator.io/doc/standalone-api-simulator-scripting/ Scripting in API Simulator]</ref><ref>[https://apisimulator.io/doc/standalone-api-simulator-template-scriptlets/ Simula Template Scriptlets]</ref> || {{yes}}<ref>[https://apisimulator.io/doc/api-simulator-in-docker-container/ API Simulator in Docker Container]</ref> || {{no}}
|-
| apiUi || {{yes}}; GPL v3.0<ref>[https://github.com/apiUi/apiUi/blob/main/COPYING apiUi License]</ref> || {{yes}} || HTTP(S); STOMP, WSDL; Swagger; OpenAPI; Cobol || {{yes}}<ref>[https://www.apiui.org/apiuigui/ The apiUi GUI]</ref> || {{yes}}<ref>[https://www.apiui.org/scripting/ apiUi Scripting; adding dynamics]</ref> || {{yes}}<ref>[https://hub.docker.com/repository/docker/apiui/apiuiserver apiUi Docker]</ref> || {{no}}
|-
| Beeceptor || {{no}}; Proprietary<ref>[https://beeceptor.com/pricing Beeceptor pricing]</ref> || {{yes}} (Free plan) || HTTP1.1; HTTP2; HTTP(S); SOAP, MITM/Proxing; Swagger; OpenAPI; TLS 1.2; XML; Local tunneling || {{yes}}|| {{yes}}<ref>[https://docs.beeceptor.com/docs/features-response-templates Handlebar templates for scripting; adding dynamic responses]</ref> || {{yes}} || {{yes}}
|-
| Camouflage || {{yes}}; MIT<ref>[https://github.com/testinggospels/camouflage/blob/main/LICENSE Camouflage License]</ref> || {{yes}} || HTTP(S), HTTP/2 gRPC, Websockets, Thrift || {{yes}}<ref>{{Cite web |url=http://camouflage-server.herokuapp.com/ |title=Camouflage UI |access-date=2021-05-22 |archive-date=2021-05-22 |archive-url=https://web.archive.org/web/20210522053652/http://camouflage-server.herokuapp.com/ |url-status=dead }}</ref> || {{yes}}<ref>[https://testinggospels.github.io/camouflage/handlebars/#code Scripting in Camouflage]</ref> || {{yes}}<ref>[https://hub.docker.com/repository/docker/shubhendumadhukar/camouflage Camouflage Docker]</ref> || {{no}}
|-
| Charles Proxy ||  {{no}}; Proprietary<ref>[https://www.charlesproxy.com/buy/eula/ Charles Proxy EULA]</ref> || {{no}} || HTTP(S) || {{yes}} || {{no}} || {{no}} || {{no}}
|-
| Ekko Proxy || {{no}}; Proprietary || {{yes}} (non commercial use)<ref>[https://www.ekkoproxy.com/eula.html Ekko Proxy License Agreement]</ref> || HTTP(S), JDBC; WSDL, Swagger, OpenApi, JWT. || {{yes}}<ref>[https://www.ekkoproxy.com/usage.html Ekko Proxy Usage]</ref> || {{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 License|Apache 2]]<ref>[https://github.com/SpectoLabs/hoverfly/blob/master/LICENSE Hoverfly license]</ref> || {{yes}} || HTTP(S) || {{yes}} || {{yes}} || {{yes}} || {{yes}} <ref>[https://cloud.hoverfly.io Hoverfly Cloud]</ref>
|-
| HTTP Toolkit || {{yes}}; [[GNU Affero General Public License|AGPL]]<ref>[https://github.com/httptoolkit/httptoolkit-desktop/blob/master/LICENSE HTTP Toolkit license]</ref> || {{yes}} (Hobbyist Edition)<ref>[https://httptoolkit.tech/pricing/ HTTP Toolkit tiers]</ref> || 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 License|MIT]]<ref>[https://github.com/intuit/karate/blob/master/LICENSE Karate license]</ref> || {{yes}}|| HTTP(S), Java interop<ref name="Karate-Netty home page">[https://github.com/intuit/karate/tree/master/karate-netty Karate-Netty home page]</ref>  || {{no}} || {{yes}}<ref name="Karate-Netty home page"/> || {{no}} || {{no}}
|-
|Keploy
|Yes
|Yes
|HTTP(S), OpenAPI, gRPC
|Yes
|Yes
|Yes
|Yes
|-
|LogDog|| {{no}}; Proprietary<ref>[https://log.dog LogDog]</ref> || {{no}} 
|HTTP(S), HTML, XML, JSON, Replay, Real-Time-Monitoring, 1-Click-Mocks|| {{yes}} || {{yes}}|| {{no}} || {{yes}}
|-
| Microcks || {{yes}}; [[Apache License|Apache 2]]<ref>[https://github.com/microcks/microcks/blob/master/LICENSE Microcks License]</ref> || {{yes}} || HTTP(S), SOAP, gRPC, GraphQL, AsyncAPI<ref>[https://microcks.io/documentation/using/ Using Microcks]</ref> || {{yes}} || {{yes}} || {{yes}} || {{no}}
|-
|Mockadillo|| {{no}}; Proprietary || {{no}}
|HTTP(S)<ref name=":0">{{Cite web|url=https://mockadillo.com|title=Mockadillo|website=Mockadillo Homepage}}</ref>|| {{yes}} || {{yes}} || {{no}} || {{yes}}
|-
| Mocklets || {{no}}; Proprietary<ref>[https://mocklets.com/terms Mocklets Terms of Use]</ref> || {{yes}} || HTTP(S) || {{yes}} || {{no}} || {{no}} || {{yes}} <ref>[https://mocklets.com/ Mocklets]</ref>
|-
|Mockoon || {{yes}}; [[MIT License|MIT]]<ref>[https://github.com/mockoon/mockoon/blob/master/LICENSE.md Mockoon license]</ref> || {{yes}}
|HTTP(S)<ref>{{Cite web|url=https://mockoon.com/features/|title=Mockoon|website=Mockoon features page}}</ref>|| {{yes}} || {{yes}} || {{yes}} <ref>[https://hub.docker.com/r/mockoon/cli Mockoon CLI dockerhub]</ref> || {{no}}
|-
| [[MockServer]]|| {{yes}}; [[Apache License|Apache 2]]<ref>[https://github.com/jamesdbloom/mockserver/blob/master/LICENSE.md MockServer License]</ref> || {{yes}} || HTTP(S) || {{yes}}<ref>[https://github.com/jamesdbloom/mockserver-ui MockServer Dashboard]</ref> || {{yes}} || {{yes}} || {{no}}
|-
|mock.qa || {{no}}; Proprietary || {{yes}} (Free plan)<ref>[https://github.com/marketplace/mockqa-grpc/plan/MLP_kgDNHMU#pricing-and-setup Mock.qa: Free plan on GitHub Markeplace]</ref> || gRPC, gRPC-web, HTTP/1.x, HTTP/2<ref>[https://mock.qa/docs/supported-protocols Mock.qa: Supported protocols]</ref> || {{yes}}<ref>[https://mock.qa/docs/playground Mock.qa: Playground]</ref> (Web) || {{yes}}<ref>[https://mock.qa/docs/yaml-config Mock.qa: Configuration]</ref><ref>[https://mock.qa/docs/examples Mock.qa: Configuration examples]</ref> (Scripting language,<ref>[https://mock.qa/docs/scripting-language Mock.qa: Scripting language]</ref> Request matching,<ref>[https://mock.qa/docs/request-matching Mock.qa: Request matching]</ref> Response templating,<ref>[https://mock.qa/docs/response-templating Mock.qa: Response templating]</ref> Data generation,<ref>[https://mock.qa/docs/data-generation Mock.qa: Data generation]</ref> Stateful scenarios<ref>[https://mock.qa/docs/stateful-scenarios Mock.qa: Stateful scenarios]</ref>) || {{no}} || {{yes}}
|-
| Mountebank || {{yes}}; [[MIT License|MIT]]<ref>[https://github.com/bbyars/mountebank/blob/master/LICENSE Mountebank license]</ref> || {{yes}}|| HTTP(S), TCP, SMTP<ref>{{usurped|1=[https://web.archive.org/web/20140530022716/http://www.mbtest.org/ Moutebank home page]}}</ref>  || {{no}} || {{yes}}<ref>{{usurped|1=[https://web.archive.org/web/20140530040537/http://www.mbtest.org/docs/api/injection Mountebank injection]}}</ref> || {{yes}}<ref>[https://blog.codecentric.de/en/2015/06/mock-server-powered-by-mountebank-and-docker/ Running Mountebank in Docker]</ref> || {{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)<ref>[http://software.parasoft.com/virtualize/community-edition/ Parasoft Virtualize Community Edition]</ref>|| AMQP, FIX, FTP, HTTP(S), ISO 8583, JMS, <br /> JDBC, MQ, MQTT, .NET WCF, RabbitMQ, SAP, TCP/IP, etc.<ref>[https://www.parasoft.com/product/parasoft-service-virtualization/#supp_env Parasoft Virtualize home page]</ref>  || {{yes}} || {{yes}}|| {{yes}}<ref>[https://docs.parasoft.com/display/SOAVIRT9103CTP310/Virtualize+Docker+Files+1.0 Virtualize Docker Files 1.0]</ref> || {{yes}}
|-
| [[Postman (software)|Postman]] || {{No}}; Proprietary || {{yes}} (Free Edition)<ref>[https://www.postman.com/pricing/ Postman Pricing]</ref>|| HTTP(S) || {{yes}} || {{yes}} (JSON Examples)|| {{no}} || {{yes}}
|-
| ProxyMan || {{no}}; Proprietary || {{yes}},<ref>[https://proxyman.io/pricing Proxyman Pricing]</ref> (Limited) || HTTP(S), Websockets || {{yes}} || {{yes}}<ref>[https://docs.proxyman.io/scripting/script Proxyman scripting]</ref>|| {{no}} || {{no}}
|-
|QuickMocker || {{No}}; Proprietary || {{yes}} (Free Subscription)<ref>[https://quickmocker.com/#pricing QuickMocker Pricing]</ref>|| HTTP(S) || {{yes}} || {{yes}}<ref>[https://quickmocker.com/faq QuickMocker RegExp & Shortcodes]</ref> || {{no}} || {{yes}}
|-
|Rapidmock || {{No}}; Proprietary<ref name=rapidmockhomepage>[https://rapidmock.com/ Rapidmock home page]</ref> || {{yes}} (Free Edition)|| HTTP(S) || {{yes}} || {{no}}|| {{no}} || {{yes}}
|-
| Requestly || {{yes}}; GPL v3.0<ref>{{Cite web|url=https://github.com/requestly/requestly/blob/master/LICENSE|title = requestly/requestly|website = [[GitHub]]}}</ref> || {{yes}}<ref>[https://app.requestly.io/pricing Requestly Pricing]</ref> || HTTP(S)|| {{yes}} || {{Yes}} || {{No}} || {{Yes}}<ref>[https://requestly.com/blog/simplifying-api-testing-with-requestly-api-mock-service/ Requestly Clound Based Mock Server]</ref>
|-
| sMockin || {{yes}}; [[Apache License|Apache 2]]<ref>{{Cite web|url=https://github.com/mgtechsoftware/smockin/blob/master/LICENSE|title = Matthewgallina/Smockin|website = [[GitHub]]|date = 27 March 2022}}</ref> || {{yes}} || HTTP, Websockets, Server Side Events, plus tools for real time monitoring & live response modification || {{yes}} || {{yes}} || {{yes}} || {{no}}
|-
| Smocker || {{yes}}; [[MIT License|MIT]]<ref>[https://github.com/Thiht/smocker/blob/master/LICENSE Smocker License]</ref> || {{yes}} || HTTP(S)<ref name=smockerdocumentation>[https://smocker.dev/guide/ Smocker documentation]</ref> || {{yes}} || {{yes}} || {{yes}} || {{no}}
|-
|SmartMock.io|| {{no}}; Proprietary<ref>[https://smartmock.io/terms SmartMock.io Terms of Use]</ref> || {{yes}}  <ref>[https://smartmock.io/pricing SmartMock.io pricing]</ref>
|HTTP(S)|| {{yes}} || {{yes}} || {{no}} || {{yes}}
|-
| Specmatic || {{yes}}; [[MIT License|MIT]]<ref>{{cite web | url=https://github.com/specmatic/specmatic/blob/main/License.md | title=Specmatic | website=[[GitHub]] }}</ref> || {{yes}} (Basic Plan) <ref>{{cite web | title=Pricing - Specmatic | url=https://specmatic.io/pricing/ }}</ref> || HTTP(S), Swagger, OpenAPI, WSDL, Kafka, AsyncAPI, GraphQL, gRPC, Arazzo, Protobuf, JDBC, Redis, JMS, Google Pub/Sub <ref>[https://docs.specmatic.io/]</ref>|| {{yes}} <ref>[https://specmatic.io/specmatic-studio/ Specmatic Studio]</ref>|| {{yes}} || {{yes}} || {{yes}}
|-
|simulado
|{{Yes}}; [[MIT License|MIT]]<ref>[https://github.com/ldabiralai/simulado/blob/master/LICENSE simulado license]</ref>
|{{Yes}}
|HTTP(S)
|{{No}}
|{{Yes}}
|{{Yes}}
|{{Yes}}
|-
| SoapUI MockServer || {{yes}}; [[European Union Public Licence|EUPL]]<ref>[https://github.com/SmartBear/soapui/blob/next/LICENSE.txt SoapUI Licence]</ref> || {{yes}} || HTTP(S)<ref name=sopauidocumentation>[https://www.soapui.org/soap-mocking/service-mocking-overview.html SoapUI MockServer documentation]</ref> || {{yes}}<ref name=sopauidocumentation/> || {{no}}<ref name=sopauidocumentation/> || {{no}}<ref name=sopauidocumentation/> || {{no}}<ref name=sopauidocumentation/>
|-
|Speedscale
|{{No}}; Proprietary
|{{Yes}}, (Free Trial)<ref>{{cite web |title=Speedscale Free Trial Version |url=https://speedscale.com/ |website=Speedscale |access-date=2024-03-20}}</ref>
|HTTP(S), gRPC, GraphQL webservices, Message queues, OSS Databases<ref>{{Cite web |title=Technology Support {{!}} Speedscale Docs |url=https://docs.speedscale.com/reference/technology-support/ |access-date=2024-03-20 |website=docs.speedscale.com |language=en}}</ref>
|{{Yes}}
|{{No}}, Not required. Traffic recording-based<ref>{{Cite web |title=How Traffic Recording Works |url=https://speedscale.com/kubernetes-traffic-replay/ |access-date=2024-03-20 |website=Speedscale |language=en-US}}</ref>
|{{Yes}}
|{{Yes}}
|-
| Stoplight || {{yes}}; [[Apache License|Apache 2]]<ref>[https://github.com/stoplightio/prism/blob/master/LICENSE Prism Licence]</ref> || {{yes}} (Free Edition)<ref>[https://stoplight.io/pricing/ Stoplight Pricing]</ref>|| 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)<ref name=ttaapisimlink>{{cite web | title=Discover Tricentis Tosca in the cloud | url=https://www.tricentis.com/products/tricentis-test-automation }}</ref>|| Http(s), AmazonSqs, AMQP, AzureServiceBus, Files, IbmMQ, Kafka, RabbitMQ, Solace || {{yes}} <ref name=ttaapisimlink/>|| {{yes}} <ref name=ttaapisimlink/>|| {{yes}} <ref>{{cite web | title=Simulate services | url=https://documentation.tricentis.com/tricentis_cloud/en/content/topics/sim_get_started.htm }}</ref>|| {{yes}} <ref name=ttaapisimlink/>
|-
| Wilma || {{yes}}; GPL v3.0<ref>[https://github.com/epam/Wilma/blob/master/COPYRIGHT.txt Wilma License]</ref> || {{yes}} <ref>[https://epam.github.io/Wilma/endusers/feature_list.html Wilma Feature list]</ref> || HTTP(S) || {{yes}} || {{yes}} || {{yes}} <ref>[https://github.com/epam/Wilma/wiki/Docker-image-of-Wilma Docker images of Wilma]</ref> || {{no}}
|-
| WireMock || {{yes}}; [[Apache License|Apache 2]]<ref>[https://github.com/wiremock/wiremock/blob/master/LICENSE.txt WireMock License]</ref> || {{yes}} || HTTP(S), gRPC, GraphQL || {{yes}} || {{yes}} || {{yes}} || {{yes}} <ref>[https://www.wiremock.io/product WireMock Cloud]</ref>
|-
| WireMock.Net || {{yes}}; [[Apache License|Apache 2]]<ref>[https://raw.githubusercontent.com/WireMock-Net/WireMock.Net/master/LICENSE WireMock.Net License]</ref> || {{yes}} || HTTP(S) || {{no}} || {{yes}} || {{yes}} <ref>[https://hub.docker.com/r/sheyenrath/wiremock.net WireMock.Net .Net Core 2.0 Linux image]</ref><ref>[https://hub.docker.com/r/sheyenrath/wiremock.net-nano/ WireMock.Net .Net Core 2.0 windows-nano image]</ref> || {{no}}
|-
| Wiresham ||  {{yes}}; [[Apache License|Apache 2]]<ref>[https://github.com/abstracta/wiresham/blob/master/LICENSE Wiresham License]</ref> || {{yes}} || TCP || {{no}} || {{yes}} || {{no}} || {{no}}
|}

== See also ==
* [[Test double]]
* [[Service virtualization]]

== References ==
{{Reflist}}
[[Category:Software comparisons|API simulation tools]]
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