Best Service Virtualization Software - Page 2

Requestly

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

Traffic Parrot

Traffic Parrot is self-hosted service virtualization and API mocking for development and test teams and for the AI coding agents they now work with. It simulates the APIs, queues and systems your software depends on, so people and agents can build and test when the real dependency is unavailable, shared, rate-limited or not yet built. A coding agent that cannot reach a backend improvises. It hard-codes a response or rewrites the test until it passes, then reports the code as working. Shared sandboxes were sized for people. One agent burns the quota. Traffic Parrot gives each agent, pipeline and developer its own deterministic backend (512 MB RAM, 200 MB disk): green means tested, red means broken. A built-in MCP server lets Claude Code, GitHub Copilot CLI, Cursor, Antigravity or any MCP client work on a running instance: read the mocks it serves and the requests it received, create and update mocks, generate mocks from an OpenAPI file, find endpoints with no mock yet, and re-test loaded mocks against real traffic. Tools that change mocks default to a dry run, the endpoint accepts only the local machine until you configure a token, and generated mocks are schema-validated with remote-code-execution helpers blocked by policy. Mocks are plain files, reviewed in the same pull request as the agent's code. No model inside and no AI service called: you bring the agent and the keys, nothing leaves your network, and security has no new AI vendor to assess. Claude and ChatGPT support assistants, set up by Traffic Parrot, explain features and troubleshoot. Protocols: HTTP and HTTPS (REST, SOAP, GraphQL), gRPC, WebSocket, JMS (ActiveMQ, RabbitMQ, AMQP 1.0, Azure Service Bus), IBM MQ (JMS and native, 7.5 to 9), Apache Thrift, and file transfers (filesystem, network share, FTP, SFTP) with FIX and SWIFT MT field matching. For the people on the team: record and replay real traffic, or import OpenAPI, Swagger, RAML, AsyncAPI and HAR. Responses can be templated, scripted, stateful and data-driven. Management REST API, Maven and Gradle plugins, Testcontainers module. Runs on a laptop, in CI, or in a container on Kubernetes or OpenShift, in AWS, Azure or Google Cloud. Who uses it: developers, testers and platform teams at global retail banks and financial enterprises, Fortune 500 e-commerce, insurtech and software houses delivering government projects, typically where IBM MQ, JMS or mainframe integrations make test environments scarce and self-hosting is required. Commercials: 14-day free trial. Floating licences priced by licence count and protocols used, with quantity discounts. Quote on request. What it is not: a hosted mocking service, or an AI that writes mocks for you (your agent does; Traffic Parrot checks and serves them). If your dependencies are all public HTTP APIs and a cloud service suits you, a lighter tool may fit better.

Average Rating: 4.0/5.0

Total Reviews: 1

Tricentis Tosca

Tricentis Tosca is an AI-powered test automation platform that enables enterprise organizations to achieve continuous testing across complex, multi-application landscapes. It is a type of end-to-end test automation solution that helps teams validate software quality across functional, regression, API, UI, accessibility, and performance test types from a unified platform. Tosca supports codeless test automation across more than 160 enterprise technologies, including SAP, Salesforce, Oracle, ServiceNow, Workday, Snowflake, and a broad range of web, desktop, and mobile applications. Its model-based approach abstracts test logic from the underlying application interface, making tests more resilient to application changes and reducing maintenance overhead across large test suites. Its Business Flow Designer lets teams visually model end-to-end business processes, mapping them directly into test cases that mirror real operational scenarios. Key capabilities include: - Agentic test automation that builds complete test cases from natural language using AI - Risk-based test optimization that prioritizes testing effort based on business impact, reducing unnecessary tests by up to 40% while increasing risk coverage by 90%+ - Cloud-native execution grid for parallel, distributed test runs at scale - Test data management with synthetic and masked data provisioning - API simulation and service virtualization to enable testing in incomplete or unavailable environments - Native and hybrid mobile test automation for iOS and Android applications, plus automated accessibility testing against WCAG 2.0 AA standards - Integrated support for SAP migrations, cloud transitions, and application modernization initiatives Tosca is designed for enterprise QA teams managing large-scale test automation programs and organizations undergoing SAP S/4HANA migrations or other complex transformation projects. It connects with ALM tools, CI/CD pipelines, defect management systems, and monitoring platforms through a broad ecosystem of integrations, and provides analytics and reporting capabilities that give stakeholders visibility into test coverage, execution status, and quality trends across the entire delivery lifecycle. Tosca is available in on-premises, cloud-hosted, or hybrid deployment models, and integrates with other Tricentis platform products, including qTest for test management, NeoLoad for performance testing, and LiveCompare for change impact analysis.

Average Rating: 4.3/5.0

Total Reviews: 63

Arga Labs

Cavisson NetOcean

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.

FIXSIM

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.

Mockintosh

Mocks for microservice environments

SOAPsuds

Testfully

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.