# Best Service Virtualization Software

  *By [Adam Crivello](https://research.g2.com/insights/author/adam-crivello)*

   Service virtualization software allows developers to test their applications by simulating various components of the eventual production environment. This software serves as a stand-in for elements that developers often have limited access to during testing, such as application programming interface (API) connections. By running tests in an environment that emulates complex interactions between real-world systems, development teams can find relevant issues early in the development process. This keeps software delivery efficient and streamlined while preemptively solving problems that would otherwise lead to delays.

Service virtualization software is closely related to [automation testing software](https://www.g2.com/categories/automation-testing), and often includes automation testing capabilities. However, automation testing automates the execution of specific test parameters, whereas service virtualization enables tests to be performed by mimicking real-world system behavior.

To qualify for inclusion in the Service Virtualization category, a product must:

- Simulate otherwise inaccessible production components for testing
- Emulate service and dependency behavior
- Allow assets to be shared between team members





## Best Service Virtualization Software At A Glance

- **Leader:** [Postman](https://www.g2.com/products/postman/reviews)
- **Easiest to Use:** [Postman](https://www.g2.com/products/postman/reviews)
- **Top Trending:** [ReadyAPI](https://www.g2.com/products/readyapi/reviews)
- **Best Free Software:** [Postman](https://www.g2.com/products/postman/reviews)


---

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---

## Top-Rated Products (Ranked by G2 Score)
  ### 1. [Postman](https://www.g2.com/products/postman/reviews)
  Postman is the world’s leading API platform, used by more than 40 million developers and 500,000 organizations to build, test, and manage APIs at scale. With Postman, teams collaborate efficiently across the entire API lifecycle, including design, development, testing, security, documentation, and governance. The platform helps ensure consistency, quality, and enterprise-grade control. Postman also offers Agent Mode (beta), built on AWS Bedrock and trained with AWS SageMaker. Agent Mode enables developers to use natural language to debug requests, organize collections, document APIs, and automate workflows without switching tools or writing custom scripts.


  **Average Rating:** 4.6/5.0
  **Total Reviews:** 1,702


**Seller Details:**

- **Seller:** [Postman](https://www.g2.com/sellers/postman)
- **Year Founded:** 2014
- **HQ Location:** San Francisco, CA
- **Twitter:** @getpostman (55,313 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/3795851/ (3,420 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Who Uses This:** Software Engineer, Software Developer
  - **Top Industries:** Computer Software, Information Technology and Services
  - **Company Size:** 38% Mid-Market, 34% Small-Business


#### Pros & Cons

**Pros:**

- Ease of Use (467 reviews)
- API Testing (401 reviews)
- API Management (311 reviews)
- Testing (282 reviews)
- Testing Efficiency (279 reviews)

**Cons:**

- Slow Performance (222 reviews)
- Performance Issues (203 reviews)
- Slow Loading (145 reviews)
- Resource Limitations (134 reviews)
- Limited Features (123 reviews)

  ### 2. [Parasoft Virtualize](https://www.g2.com/products/parasoft-virtualize/reviews)
  Create, deploy, and manage virtual test environments—anytime, anywhere. During software testing you are often constrained by limited access to real data and live services in your test environment. The Parasoft service virtualization tool lets you create simulated equivalents that behave just like the real thing. Go beyond basic mocking and stubbing to create a more robust simulation for APIs and services. Deploy a “digital twin” of your test environment to use as a sandbox for partner development or as a virtual endpoint for internal testing. Virtualize goes beyond other service virtualization solutions with its integration with the Parasoft Continuous Testing Platform, which provides an intuitive browser-based interface for collaboration and coordination of your virtual services. You can bundle virtual assets and test cases into a virtual test environment, giving you full control over your test environment and the ability to test earlier and more completely. Testing is already hard, and it’s even harder when you can’t access components that are out of your control because systems are still evolving, difficult to access, difficult to scale, or difficult to configure. Parasoft Virtualize enables testers and developers to simulate services or data when access is limited or unreliable. Increase testing efficiency with service virtualization. » Remove test constraints. » Improve product quality. » Decrease time-to-market. » Reduce testing costs.


  **Average Rating:** 4.9/5.0
  **Total Reviews:** 14


**Seller Details:**

- **Seller:** [Parasoft](https://www.g2.com/sellers/parasoft)
- **Year Founded:** 1987
- **HQ Location:** Monrovia, CA
- **Twitter:** @Parasoft (2,596 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/parasoft/ (303 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Company Size:** 71% Enterprise, 14% Mid-Market


  ### 3. [ReadyAPI](https://www.g2.com/products/readyapi/reviews)
  ReadyAPI allows teams to create, manage, and execute automated functional, security, and performance tests of RESTful, SOAP, Kafka and other web services in one centralized interface inside your CI/CD pipeline – accelerating API quality for Agile and DevOps software teams. Get started by importing API definitions like OpenAPI/Swagger or AsyncAPI, testing and recording live API traffic, or virtualizing web services to remove pipeline dependencies.


  **Average Rating:** 4.4/5.0
  **Total Reviews:** 70


**Seller Details:**

- **Seller:** [SmartBear](https://www.g2.com/sellers/smartbear)
- **HQ Location:** Somerville, MA
- **Twitter:** @smartbear (16,478 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/108422/ (994 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Top Industries:** Information Technology and Services, Computer Software
  - **Company Size:** 45% Enterprise, 41% Mid-Market


#### Pros & Cons

**Pros:**

- Ease of Use (1 reviews)
- Easy Testing (1 reviews)
- Time-saving (1 reviews)

**Cons:**

- Expensive (1 reviews)
- High Licensing Cost (1 reviews)
- Licensing Issues (1 reviews)

  ### 4. [Beeceptor](https://www.g2.com/products/beeceptor/reviews)
  Beeceptor is a mock server and service virtualization platform that helps QA teams simulate APIs, increase coverate, remove backend dependencies and shift left, and test integrations earlier in the development cycle. It is used by QA engineers, SDETs, automation teams, and frontend developers who need predictable, configurable API behavior without relying on real upstream systems. Beeceptor provides virtual services (service replicas) for REST, GraphQL, SOAP, gRPC, and other protocols, allowing QA teams to move forward independently and reduce delays caused by external dependencies. The platform is suitable for shift-left testing, CI pipelines, contract validation, and performance workflows where controlled API responses are required. ## Key capabilities include: 1. Multi-protocol support across REST APIs, OpenAPI-generated mocks, GraphQL schemas, SOAP/WSDL, gRPC, CRUD routes, and Mutual TLS. 2. Stateful mock servers that store per-request variables, lists, and counters to simulate multi-step workflows. 3. AI-generated mock data that reads schema structures and produces realistic, context-aware JSON responses. 4. No-code and low-code configuration using visual rules, with deeper customization via a template engine that supports IF/ELSE, SWITCH, REPEAT, and JSON operators. 5. Support for delays, error responses, conditional logic, data correlation, and dynamic payload generation. 6. Creating a Mock Service directory, multi-level mock services, test data management, and having full governance model. ## Benefits for QA and engineering teams: - Faster test execution cycles by removing reliance on real backend systems. - Parallel development and integration testing across distributed services. - Consistent, reproducible responses that support automated testing and CI/CD pipelines. - Improved coverage of edge cases, negative paths, latency conditions, and schema-driven scenarios. - Reduced cost and reduced usage of rate-limited or metered third-party APIs. ## Security Beeceptor includes enterprise-grade security features suitable for regulated environments. It supports SSO/SAML, audit logs, IP access controls, header masking, and role-based access. All data in transit and at rest is encrypted. Beeceptor is compliant with SOC 2 Type II and ISO 27001 requirements. Enterprises can deploy Beeceptor in the cloud or in on-premise environments that require isolated infrastructure and unlimited usage.


  **Average Rating:** 4.8/5.0
  **Total Reviews:** 73


**Seller Details:**

- **Seller:** [Beeceptor](https://www.g2.com/sellers/beeceptor)
- **Year Founded:** 2017
- **HQ Location:** Hyderabad, Telangana
- **Twitter:** @beeceptor (174 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/beeceptor/ (7 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Who Uses This:** Software Developer
  - **Top Industries:** Computer Software, Information Technology and Services
  - **Company Size:** 52% Small-Business, 25% Mid-Market


#### Pros & Cons

**Pros:**

- Ease of Use (35 reviews)
- Speed (15 reviews)
- Easy Setup (14 reviews)
- API Testing (11 reviews)
- Integrations (10 reviews)

**Cons:**

- Missing Features (8 reviews)
- Request Limitations (7 reviews)
- Limited Features (3 reviews)
- UX Improvement (3 reviews)
- Bug Issues (2 reviews)

  ### 5. [Mockoon](https://www.g2.com/products/mockoon-mockoon/reviews)
  Mockoon is a powerful, open-source platform designed to streamline API mocking processes. It offers a comprehensive suite of tools tailored to meet the needs of developers, QA engineers, and teams working with APIs. API Mocking Tools Mockoon provides intuitive and robust API mocking tools, enabling users to create, manage, and test API endpoints effortlessly. With Mockoon, you can simulate complex API behaviors, including request/response cycles, latency, and error handling. This ensures that your application can handle real-world scenarios before going live. CLI for Integration Testing Mockoon's Command Line Interface (CLI) facilitates seamless integration testing. The CLI allows you to automate API mock server operations, making it an ideal tool for continuous integration and deployment (CI/CD) pipelines. By integrating Mockoon into your workflow, you can ensure consistent and reliable testing outcomes across various environments. Cloud Services for Team Collaboration and Deployment Mockoon Cloud Services enhance team collaboration and deployment capabilities. With cloud-based solutions, teams can collaborate in real-time, share mock API configurations, and synchronize changes effortlessly. The cloud platform also supports easy deployment of mock servers, ensuring that your team can access and test APIs from anywhere, anytime. Open Source and Community-Driven As an open-source project, Mockoon benefits from a vibrant community of developers and contributors. This ensures continuous improvement, regular updates, and a wide range of features driven by user needs. The open-source nature of Mockoon also means that it is highly customizable, allowing you to tailor it to your specific requirements.


  **Average Rating:** 4.5/5.0
  **Total Reviews:** 17


**Seller Details:**

- **Seller:** [Mockoon](https://www.g2.com/sellers/mockoon)
- **Year Founded:** 2017
- **HQ Location:** Luxembourg
- **LinkedIn® Page:** https://www.linkedin.com/company/mockoon (2 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Top Industries:** Computer Software
  - **Company Size:** 41% Small-Business, 35% Enterprise


#### Pros & Cons

**Pros:**

- Free Usage (2 reviews)
- Open Source (2 reviews)
- Deployment (1 reviews)
- Ease of Use (1 reviews)

**Cons:**

- Learning Curve (1 reviews)
- Poor Documentation (1 reviews)

  ### 6. [WireMock Cloud](https://www.g2.com/products/wiremock-wiremock-cloud/reviews)
  WireMock Cloud is AI-native API simulation platform for simulating APIs and services with speed and precision. It enables teams to accelerate development and testing through robust, stateful API simulation, support for REST, SOAP, GraphQL, and gRPC, and alignment with OpenAPI and schema-first workflows. With dynamic request matching, data source stubbing, enterprise-grade controls, Cloud, on-premise or hybrid deployment options, and an intuitive, developer and QA friendly UX, WireMock Cloud replaces legacy service virtualization with a scalable, easy-to-use solution for building and testing integrations faster.


  **Average Rating:** 5.0/5.0
  **Total Reviews:** 10


**Seller Details:**

- **Seller:** [WireMock](https://www.g2.com/sellers/wiremock)
- **HQ Location:** Menlo Park, California
- **LinkedIn® Page:** https://www.linkedin.com/company/wiremock/ (13 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Company Size:** 50% Mid-Market, 30% Enterprise


#### Pros & Cons

**Pros:**

- Ease of Use (4 reviews)
- Customer Support (3 reviews)
- API Testing (2 reviews)
- Integrations (2 reviews)
- Tools (2 reviews)

**Cons:**

- API Limitations (1 reviews)
- Expensive (1 reviews)
- Limited Community Support (1 reviews)

  ### 7. [Broadcom Service Virtualization](https://www.g2.com/products/broadcom-service-virtualization/reviews)
  Service Virtualization simulates unavailable systems across the software development lifecycle (SDLC), allowing developers, testers, integration, and performance teams to work in parallel for faster delivery and higher application quality and reliability.


  **Average Rating:** 4.3/5.0
  **Total Reviews:** 3


**Seller Details:**

- **Seller:** [Broadcom](https://www.g2.com/sellers/broadcom-ab3091cd-4724-46a8-ac89-219d6bc8e166)
- **Year Founded:** 1991
- **HQ Location:** San Jose, CA
- **Twitter:** @broadcom (62,960 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/broadcom/ (55,707 employees on LinkedIn®)
- **Ownership:** NASDAQ: CA

**Reviewer Demographics:**
  - **Company Size:** 67% Enterprise, 33% Small-Business


  ### 8. [OpenText Service Virtualization](https://www.g2.com/products/opentext-service-virtualization/reviews)
  Micro Focus Service Virtualization is an application simulation software designed to keep users on schedule and focused on service quality.


  **Average Rating:** 4.8/5.0
  **Total Reviews:** 3


**Seller Details:**

- **Seller:** [OpenText](https://www.g2.com/sellers/opentext)
- **Year Founded:** 1991
- **HQ Location:** Waterloo, ON
- **Twitter:** @OpenText (21,575 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/2709/ (23,339 employees on LinkedIn®)
- **Ownership:** NASDAQ:OTEX

**Reviewer Demographics:**
  - **Company Size:** 50% Mid-Market, 50% Small-Business


#### Pros & Cons

**Pros:**

- Deployment (1 reviews)
- Features (1 reviews)
- Security (1 reviews)


  ### 9. [MockLab](https://www.g2.com/products/mocklab/reviews)
  MockLab is an API simulator that helps software teams test faster and better.


  **Average Rating:** 4.7/5.0
  **Total Reviews:** 3


**Seller Details:**

- **Seller:** [MockLab](https://www.g2.com/sellers/mocklab)
- **Year Founded:** 2017
- **HQ Location:** Menlo Park, California, United States
- **Twitter:** @mocklab (1 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/wiremock/ (13 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Company Size:** 67% Mid-Market, 33% Small-Business


#### Pros & Cons

**Pros:**

- API Management (1 reviews)
- Speed (1 reviews)

**Cons:**

- Testing Issues (1 reviews)

  ### 10. [Mocky.io](https://www.g2.com/products/mocky-io/reviews)
  The world easiest & fastest tool belts to mock your APIs|


  **Average Rating:** 4.0/5.0
  **Total Reviews:** 2


**Seller Details:**

- **Seller:** [Mocky.io](https://www.g2.com/sellers/mocky-io)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Company Size:** 50% Mid-Market, 50% Small-Business


  ### 11. [BlazeMeter Continuous Testing Platform](https://www.g2.com/products/blazemeter-continuous-testing-platform/reviews)
  BlazeMeter, a comprehensive continuous testing platform that boosts your software delivery speed and quality, specializes in performance testing, functional UI testing, API testing and monitoring, along with AI-driven test data generation and service virtualization. It enables swift and scalable simulations of user activity, ensuring robust performance and seamless functionality across applications. Integrating with CI/CD pipelines for both development and operations, BlazeMeter provides detailed, real-time analytics to optimize performance and meet stringent SLAs. Its service virtualization capabilities allow for uninterrupted testing and agile delivery, establishing it as the ideal solution for high-velocity software development teams focused on delivering superior user experiences. Learn more at blazemeter.com.


  **Average Rating:** 4.0/5.0
  **Total Reviews:** 24


**Seller Details:**

- **Seller:** [Perforce](https://www.g2.com/sellers/perforce)
- **Year Founded:** 1995
- **HQ Location:** Minneapolis, MN
- **Twitter:** @perforce (5,087 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/perforce/ (2,032 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Top Industries:** Information Technology and Services, Computer Software
  - **Company Size:** 52% Mid-Market, 36% Enterprise


#### Pros & Cons

**Pros:**

- Ease of Use (4 reviews)
- Helpful (3 reviews)
- Performance (3 reviews)
- Team Collaboration (3 reviews)
- Testing (3 reviews)

**Cons:**

- Expensive (3 reviews)
- Complexity (1 reviews)
- Data Limitations (1 reviews)
- Inaccuracy (1 reviews)
- Integration Issues (1 reviews)

  ### 12. [Hoverfly Cloud](https://www.g2.com/products/hoverfly-cloud/reviews)
  Hosted, high-performance, API simulations for your development environment and CI pipeline


  **Average Rating:** 4.5/5.0
  **Total Reviews:** 1


**Seller Details:**

- **Seller:** [SpectoLabs](https://www.g2.com/sellers/spectolabs)
- **Year Founded:** 2015
- **HQ Location:** Reading, GB
- **LinkedIn® Page:** http://www.linkedin.com/company/hoverfly-cloud (2 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Company Size:** 100% Small-Business


  ### 13. [IBM DevOps Test Virtualization](https://www.g2.com/products/ibm-devops-test-virtualization/reviews)
  IBM DevOps Test Virtualization software enables early and frequent testing in the development lifecycle. It removes dependencies by virtualizing part or all of an application or database so software testing teams don’t have to wait for the availability of those resources to begin. Combined with Integration Tester, you can achieve continuous software testing.


  **Average Rating:** 4.5/5.0
  **Total Reviews:** 1


**Seller Details:**

- **Seller:** [IBM](https://www.g2.com/sellers/ibm)
- **Year Founded:** 1911
- **HQ Location:** Armonk, NY
- **Twitter:** @IBM (708,000 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/1009/ (324,553 employees on LinkedIn®)
- **Ownership:** SWX:IBM

**Reviewer Demographics:**
  - **Company Size:** 100% Small-Business


  ### 14. [Mountebank](https://www.g2.com/products/mountebank/reviews)
  mountebank is the first open source tool to provide cross-platform, multi-protocol test doubles over the wire. Simply point your application under test to mountebank instead of the real dependency, and test like you would with traditional stubs and mocks.


  **Average Rating:** 4.5/5.0
  **Total Reviews:** 1


**Seller Details:**

- **Seller:** [Mountebank](https://www.g2.com/sellers/mountebank)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Company Size:** 100% Small-Business


  ### 15. [Requestly](https://www.g2.com/products/requestly/reviews)
  Requestly is a modern and powerful companion for API Development and Testing. It is an open-source tool purpose-built to speed up and simplify API development workflow for developers and QAs. It is a combination of API Client and HTTP Interceptor that helps create and share API Contracts, testing APIs, and easily mock and integrate them into web and mobile apps. Requestly Benefits: ✅ Open Source: Requestly is open-source tools, giving transparency on how we handle your data. ✅ API Client: A modern & privacy-first API Client with all the features like API Collection, Variables, Scripts. ✅ Intercept HTTPS Traffic: Enables you to watch traffic from the mobile app you are developing for testing and debugging. ✅ HTTP Request Modification: Enables network request and response modification to mock different edge cases and scenarios of a real app. ✅ API Mocks: Creates local and cloud based API mocks to develop and isolate testing of an application. ✅ Record & Bulk mocks: Supports recording traffic of an existing service and create mocks in few seconds. ✅ Team Workspaces: Offers flexibility to work with team and share mocks, request modification rules and API contracts with team. ✅ GraphQL Support: Integrates with GraphQL development flows using different set of filters for GraphQL APIs. Learn more at: https://requestly.com/


  **Average Rating:** 4.7/5.0
  **Total Reviews:** 5


**Seller Details:**

- **Seller:** [Requestly](https://www.g2.com/sellers/requestly)
- **Year Founded:** 2021
- **HQ Location:** San Francisco, US
- **Twitter:** @requestlyio (1,570 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/requestly (11 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Company Size:** 40% Mid-Market, 40% Small-Business


#### Pros & Cons

**Pros:**

- Time-saving (2 reviews)
- Cross-Browser Testing (1 reviews)
- Easy Implementation (1 reviews)
- Implementation Ease (1 reviews)
- Setup Ease (1 reviews)

**Cons:**

- Complexity (1 reviews)
- Difficult Setup (1 reviews)
- Learning Curve (1 reviews)

  ### 16. [Tricentis Tosca](https://www.g2.com/products/tricentis-tosca/reviews)
  Tricentis Tosca provides a unique approach to test automation – one that is AI-powered, codeless, and end-to-end so it can test everything in a complex IT landscape, and ensure business processes work flawlessly – no matter where changes occur. Its 160+ technology support means users can easily combine and orchestrate UI, API, and data testing within the same test case, including combining virtually any enterprise, custom, homegrown and mobile application. With its model-based approach, Tosca enables business, QA and IT teams to create and maintain reusable test assets at speed and scale while boosting test automation rates to 90% from release to release. With Tosca, teams can test 12x faster, increase risk coverage to 85%+ and cut overall testing costs by 40%. Tosca also features Vision AI, a patented deep learning technology that augments UI testing and increases test stability through self-healing. Vision AI recognizes UI objects (hand drawn, documents, or computer screens) including different control types (fields, inputs, tables, buttons, dropdowns, etc.) allowing it to steer objects regardless of the technical underlayer. Vision AI extends UI automation to various use cases such as automating mockup designs for extreme shift-left testing, and apps running on remote desktops (Citrix), including legacy and modern apps that require heavy test customization. Tosca also features risk optimization, service virtualization, test data management, and smart test case design, making it a comprehensive continuous testing tool.


  **Average Rating:** 4.3/5.0
  **Total Reviews:** 62


**Seller Details:**

- **Seller:** [Tricentis](https://www.g2.com/sellers/tricentis)
- **Year Founded:** 2007
- **HQ Location:** Vienna, Austria
- **Twitter:** @Tricentis (12,909 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/656215/ (1,663 employees on LinkedIn®)

**Reviewer Demographics:**
  - **Top Industries:** Information Technology and Services, Computer Software
  - **Company Size:** 53% Enterprise, 28% Small-Business


#### Pros & Cons

**Pros:**

- Automation (4 reviews)
- Automation Support (3 reviews)
- Automation Ease (2 reviews)
- Ease of Learning (2 reviews)
- Ease of Use (2 reviews)

**Cons:**

- Poor Customer Support (2 reviews)
- Browser Compatibility (1 reviews)
- Difficulty (1 reviews)
- Integration Issues (1 reviews)
- Learning Curve (1 reviews)

  ### 17. [Antithesis](https://www.g2.com/products/antithesis/reviews)
  Antithesis is a continuous reliability platform that autonomously searches for problems in your software within a simulated environment. Every problem we find can be perfectly reproduced, allowing for efficient debugging of even the most complex problems.




**Seller Details:**

- **Seller:** [Antithesis](https://www.g2.com/sellers/antithesis)
- **HQ Location:** Vienna, Virginia, United States
- **LinkedIn® Page:** https://www.linkedin.com/company/antithesis-operations (94 employees on LinkedIn®)



  ### 18. [Cavisson NetOcean](https://www.g2.com/products/cavisson-netocean/reviews)
  Cavisson’s performance testing, monitoring, and diagnostics software helps enterprises maximize up-time and optimize server response time for seamless transactions and exceptional buying experiences.




**Seller Details:**

- **Seller:** [Cavisson Systems](https://www.g2.com/sellers/cavisson-systems)
- **Year Founded:** 2011
- **HQ Location:** Santa Clara, US
- **Twitter:** @CavissonSystems (196 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/450651 (390 employees on LinkedIn®)



  ### 19. [FIXSIM](https://www.g2.com/products/fixsim/reviews)
  FIXSIM is a browser-based FIX protocol simulator and automated testing platform built for QA engineers, developers, and integration teams at broker-dealers, buy-side firms, OMS/EMS vendors, exchanges, and fintech companies. In production since 2012, FIXSIM eliminates the need for live counterparties during FIX connectivity testing, certification, and regression validation. Unlike traditional on-premise tools, FIXSIM requires no software installation, no VPN, and no infrastructure setup. Teams connect directly from a browser using TLS-encrypted sessions and can begin testing FIX order flow within minutes. This makes it practical for globally distributed teams, remote QA engineers, and contractors who need immediate access to a reliable FIX testing environment without waiting for IT provisioning. FIXSIM acts as a FIX counterparty — initiator, acceptor, or both simultaneously — to simulate the full range of trading scenarios: order fills, partial fills, cancels, rejects, replaces, and session recovery. It supports all major FIX versions from FIX 4.0 through FIX 5.0SP2, making it suitable for firms working across legacy and modern trading infrastructure. For manual testing, the platform provides real-time message blotter and session views for inspecting live FIX message flows, order state, and execution reports. Engineers can send individual messages, trigger order actions, and observe the full session lifecycle in real time. This is particularly valuable during initial integration work, debugging, and client onboarding certification where visibility into message-level detail matters. For automated testing, the Rule Builder creates deterministic, repeatable test scenarios that respond automatically to incoming FIX messages. Teams define rules that simulate venue behavior — automatic fills on New Order Singles, conditional rejects, partial execution sequences, and more — enabling zero-touch regression testing that runs consistently without manual intervention. This makes it straightforward to validate that OMS and EMS order state machines behave correctly after code changes. For teams running CI/CD pipelines, the FIXSIM REST API provides programmatic control over sessions, message injection, and scenario execution. Development and QA teams use the API to trigger FIX test scenarios directly from build pipelines, ensuring that FIX connectivity and business logic are validated automatically on every release. FIXSIM is used by broker-dealers certifying client FIX connectivity before go-live, buy-side firms validating OMS and EMS integrations, OMS and EMS software vendors testing order routing logic, exchanges and ECNs stress testing FIX market access, and fintech teams integrating FIX for the first time. The platform supports high-volume stress testing to validate system behavior under sustained FIX message throughput, and multi-user access allows entire QA teams to work within a single firm account. FIXSIM is a cloud-hosted SaaS product operated by Gamma Three Trading, LLC, based in Boston, Massachusetts. Gamma Three Trading is a member of the FIX Trading Community, the non-profit standards body responsible for the FIX protocol specification. The platform processes over 1,000 FIX sessions and 2 million FIX messages daily, maintains 99.9% uptime, and offers a 7-day free trial with no credit card required. Subscriptions are month-to-month with no annual contracts.




**Seller Details:**

- **Seller:** [Gamma Three Trading](https://www.g2.com/sellers/gamma-three-trading)
- **Year Founded:** 2010
- **HQ Location:** Boston, US
- **LinkedIn® Page:** https://www.linkedin.com/company/gamma-three-trading/ (1 employees on LinkedIn®)



  ### 20. [Mockintosh](https://www.g2.com/products/mockintosh/reviews)
  Mocks for microservice environments




**Seller Details:**

- **Seller:** [Mockintosh](https://www.g2.com/sellers/mockintosh)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/No-Linkedin-Presence-Added-Intentionally-By-DataOps (1 employees on LinkedIn®)



  ### 21. [Testfully](https://www.g2.com/products/testfully/reviews)
  Testfully is a comprehensive API development platform designed to streamline the creation, testing, and monitoring of APIs. It offers a suite of tools that enhance productivity and ensure the reliability of APIs throughout their lifecycle. With both cloud-based and offline capabilities, Testfully caters to diverse development environments, providing flexibility and security for teams of all sizes. Key Features and Functionality: - API Client: Facilitates seamless interaction with RESTful and GraphQL APIs through a user-friendly request editor. Features include customizable authentication, parameter management, and support for scripts using modern JavaScript. Users can choose between cloud storage or local control for their data, ensuring adaptability to various workflows. - API Testing: Enables efficient, automated testing without the need for coding. Features such as folder runners allow for simultaneous execution of multiple requests, while no-code testing capabilities facilitate response validation and contract testing. Request chaining supports the creation of realistic end-user scenarios, enhancing the depth of testing. - API Monitoring: Provides continuous health checks and functional testing to maintain API performance. Users can reuse existing requests for monitoring purposes, receive notifications through various channels, and access comprehensive histories of past runs to diagnose and resolve issues promptly. - Offline Capability: Offers a fully offline and air-gapped API development toolkit, allowing developers to work without cloud dependencies. This feature is particularly beneficial for environments with strict security requirements. - Desktop Applications: Provides desktop apps for Windows, Mac, and Linux, ensuring a consistent user experience across platforms. These applications support the same functionalities as the web app and are recommended for scenarios involving self-signed SSL certificates or APIs without CORS configuration. Primary Value and User Solutions: Testfully addresses the challenges of API development by offering an integrated platform that simplifies the processes of building, testing, and monitoring APIs. Its no-code testing capabilities make advanced API testing accessible to non-programmers, while the flexibility of cloud and offline options ensures adaptability to various security and operational requirements. By automating repetitive tasks and providing robust monitoring tools, Testfully enhances productivity and ensures the reliability of APIs, allowing development teams to focus on delivering high-quality software solutions.




**Seller Details:**

- **Seller:** [Testfully](https://www.g2.com/sellers/testfully)
- **Year Founded:** 2020
- **HQ Location:** Sydney, AU
- **LinkedIn® Page:** https://www.linkedin.com/company/testfully/ (3 employees on LinkedIn®)



  ### 22. [Traffic Parrot](https://www.g2.com/products/traffic-parrot/reviews)
  Traffic Parrot provides API and service simulation, service virtualization and API mocking software and consulting services to both startups and established e-commerce and financial institutions.




**Seller Details:**

- **Seller:** [Traffic Parrot](https://www.g2.com/sellers/traffic-parrot)
- **Year Founded:** 2016
- **HQ Location:** London, GB
- **LinkedIn® Page:** https://www.linkedin.com/company/traffic-parrot/ (2 employees on LinkedIn®)





## Parent Category

[Development Software](https://www.g2.com/categories/development)



## Related Categories

- [Software Testing Tools](https://www.g2.com/categories/software-testing)