--- title: Service virtualization | Qventis One description: Simulate APIs that are down, unfinished or costly to call, from OpenAPI specs or recorded traffic, in the same plain-English steps. --- [Skip to content](https://qventis.ai/engines/virtualization#main) [![qventis](https://qventis.ai/hubfs/raw_assets/public/qventis-one/images/qventis-logo.svg)![qventis](https://qventis.ai/hubfs/raw_assets/public/qventis-one/images/qventis-logo-reverse.svg)](https://qventis.ai/?hsLang=en) - Platform [**Qventis Engine**The core of the platform. Automate any app, any stack, in plain English, with zero AI tokens at run time.WebDesktopTerminalAPIDataOne plain-English suite](https://qventis.ai/engine?hsLang=en) Platform [**Qventis One**The engine, scaled to one pane of glass](https://qventis.ai/one?hsLang=en) [**Release Intelligence**Every vendor change, mapped to your processes](https://qventis.ai/release-intelligence?hsLang=en) [**App Model**One model of your app, learned once](https://qventis.ai/one/app-model?hsLang=en) [**Quality View**Evidence and a signed go or no-go](https://qventis.ai/one/quality-view?hsLang=en) Automation [**Studio**Anyone can automate, in plain English](https://qventis.ai/platform/studio?hsLang=en) [**Eight engines**Functional to accessibility in one flow](https://qventis.ai/one#engines) [**Integrations**CI, ALM, chat and coding agents](https://qventis.ai/platform/integrations?hsLang=en) [**Trust and security**AI on your terms, people approve](https://qventis.ai/platform/trust?hsLang=en) How it works[Detect](https://qventis.ai/release-intelligence?hsLang=en)→[Assess](https://qventis.ai/one/app-model?hsLang=en)→[Automate](https://qventis.ai/engine?hsLang=en)→[Assure](https://qventis.ai/one/quality-view?hsLang=en) - [Release Intelligence](https://qventis.ai/release-intelligence?hsLang=en) - Platforms [**Release in confidence**Certify every vendor update and configuration change before your business feels it.PreviewTestProdNextImpact known before the window opens](https://qventis.ai/platforms?hsLang=en) Enterprise platforms [**Oracle**Quarterly updates](https://qventis.ai/platforms/oracle?hsLang=en)[**Workday**R1 and R2](https://qventis.ai/platforms/workday?hsLang=en) [**SAP**S/4HANA releases](https://qventis.ai/platforms/sap?hsLang=en)[**Salesforce**Three a year](https://qventis.ai/platforms/salesforce?hsLang=en) [**ServiceNow**Family releases](https://qventis.ai/platforms/servicenow?hsLang=en)[**Dynamics 365**Release waves](https://qventis.ai/platforms/dynamics-365?hsLang=en) [**nCino**Two calendars](https://qventis.ai/platforms/ncino?hsLang=en)[**Coupa**Major releases](https://qventis.ai/platforms/coupa?hsLang=en) [**All 40+ platforms**ERP, HCM, CRM, ITSM, banking, insurance](https://qventis.ai/engines/packaged-apps?hsLang=en) By need [**Release testing**Test only what a change affects](https://qventis.ai/solutions/release-testing?hsLang=en) [**Industries**Regulated and complex businesses](https://qventis.ai/industries?hsLang=en) [**Legacy desktop**Apps automation never reached](https://qventis.ai/solutions/legacy-desktop?hsLang=en) [**Quality CoE**One standard across the business](https://qventis.ai/solutions/quality-coe?hsLang=en) Certify an upgrade[Release notes in](https://qventis.ai/release-intelligence?hsLang=en)→[Impact traced](https://qventis.ai/release-intelligence?hsLang=en)→[Tests run](https://qventis.ai/engine?hsLang=en)→[Signed off](https://qventis.ai/one/quality-view?hsLang=en) - Resources [**Brochures and guides**Platform briefs sent to your inbox](https://qventis.ai/resources?hsLang=en) [**Customers**How teams release in confidence](https://qventis.ai/customers?hsLang=en) [**Blog**Field notes on releases, quality and AI](https://qventis.ai/blog?hsLang=en) [**Editions**Start with one need, grow into One](https://qventis.ai/editions?hsLang=en) [**Support**Guides and community for customers](https://qventis.ai/support?hsLang=en) - Company [**About qventis**Why we built one platform](https://qventis.ai/about?hsLang=en) [**Trust center**How we protect your data](https://qventis.ai/platform/trust?hsLang=en) [**Contact**Talk to a person](https://qventis.ai/contact?hsLang=en) Talk to usSend a request Search platforms, releasesCtrl K [Book a demo](https://qventis.ai/contact#demo) [Qventis One](https://qventis.ai/one?hsLang=en)/Engines/Service virtualization Service virtualization engine # Stop waiting on APIs that aren't ready Service virtualization runs on the Qventis Engine. Simulate a service that is down, unfinished or charged per call with one plain-English step, built from a spec or recorded traffic, in the same test that drives the screen. [Book a demo](https://qventis.ai/contact#demo)[See Qventis One](https://qventis.ai/one?hsLang=en) - Unblock tests today - One step language, no second tool - Simulated and real kept apart **Loan approved on a good score**Web + simulation, 5 steps 1. Simulate GET '/credit-score' returning '720' 2. Open the 'Loan application' app 3. Click the 'Submit' button 4. Check that 'Decision' shows 'Approved' 5. Check that '/credit-score' was called once ## Unblock tests waiting on a service ### It is down A shared environment is offline or a partner sandbox is flaky. Simulate it and keep the suite green for the right reasons. ### It is unfinished The front end is ready and the API is not. Simulate from the agreed spec and test the screens now. ### It is costly Credit bureaus and payment gateways charge per call. Simulate them daily and call the real one before release. ## How service virtualization works Build a simulationFrom a spec or traffic Edge casesErrors and delays in one sentence Simulated or realAlways know which you tested One model, one paneShared APIs, one results view ### Start from a spec or traffic Simulations live in Studio beside your tests and use the same verbs. - From an OpenAPI spec: every path and response shape - From recorded traffic: the responses your app actually gets, with sensitive values masked - Tune behavior with steps: return a value, an error or a delay [Build simulations in Studio](https://qventis.ai/platform/studio?hsLang=en) ### Hard cases made easy A timeout or a 503 is hard to trigger on a real service. Here it is one step. 1. Simulate POST '/payments' returning status '503' 2. Simulate POST '/payments' returning '201' after 4 seconds 3. Check that the 'Retry' button is shown [Use simulations under load](https://qventis.ai/engines/performance?hsLang=en) ### Honest evidence by stage A pass against a simulation is useful, and it is a different kind of evidence from a pass against the real service. - Developer and CI runs simulate unfinished and costly services - Integration runs use real internal services and simulated third parties - Release readiness flags any check that only passed on a simulation [See readiness in Quality View](https://qventis.ai/one/quality-view?hsLang=en) ### Switch by environment Simulations sit in the [App Model](https://qventis.ai/one/app-model?hsLang=en) next to the real APIs they stand in for. - Functional, performance and data tests switch to a simulation without editing a step - Every run records which services were simulated - [Quality View](https://qventis.ai/one/quality-view?hsLang=en) uses that record to keep readiness honest [Explore the App Model](https://qventis.ai/one/app-model?hsLang=en) ## Unblock your stuck suite in one session Bring the API that holds your tests up, and leave with a simulation your steps can use. 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