Wilma
Wilma: A self-hosted choice for transparent proxy stubbing, traffic control, and fault simulation. Ranked #16 of 21 in Service Virtualization Software by our editors (7.0/10); pricing: Free plan; best for open-source transparent proxy stubbing.
At a glance
- Editor score7.0 / 10
- PricingFree plan
- Best forOpen-source transparent proxy stubbing
- Free planYes
- Paid fromFree
- Deployment modelSelf_hosted
- Facts checked20 Sep 2026
Where it wins
- HTTP/HTTPS proxying with traffic capture and real-time interception
- Stateful sequences and fault simulation for varied test scenarios
- JSON stubs, web configuration, endpoints, and plugin support
Where it doesn't
- Does not provide database virtualization
- Does not provide messaging virtualization
- Integration support is outside its stated scope
Our verdict on Wilma
Wilma is an open-source Java service virtualization tool for development and testing. It is designed for teams that need to proxy available dependencies, emulate unavailable services, capture traffic, generate stub responses, or modify requests and responses during testing. Its stated use cases include automated, manual, integration, functional, end-to-end, performance, and microservice testing. Wilma runs as a self-hosted deployment through standalone applications or Docker images, with web and service-endpoint access for runtime configuration.
Its strongest capability is the combination of transparent proxying and configurable service stubbing. Wilma supports HTTP/HTTPS traffic capture, decoding, logging, and storage, then allows real-time request and response interception and modification. Teams can define stubs with JSON, handle stateful message sequences, and simulate timeouts, delays, and error responses. An optional request-response message search application supports analysis of logged exchanges. Plugin support extends the tool with condition checkers, response formatters, and interceptors, giving technical teams additional control over how virtualized services behave.
Wilma is a fit for organizations that prefer an open-source, self-hosted approach and need focused HTTP/HTTPS virtualization with record-and-replay behavior, state handling, and fault injection. Its GPLv3 distribution and Docker availability support deployment flexibility within that model. The trade-off is breadth: Wilma does not cover database or messaging virtualization, and integration support is outside its stated scope. Teams seeking a focused proxy and stubbing layer should consider it; teams needing broader data, messaging, or ecosystem virtualization should choose a tool built around those requirements instead.
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Wilma pricing
Wilma fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Deployment model | Self_hosted |
| Stateful simulation | Yes |
| Fault injection | Yes |
| Database virtualization | No |
| Messaging virtualization | No |
| Record and replay | Yes |
| Deployment | Self-hosted |
| Platforms | Web |
| Support | Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | epam.github.io |
| Facts checked | 20 Sep 2026 |
Alternatives to Wilma
- OpenText Service VirtualizationA mature self-hosted platform for simulating dependencies across enterprise testing workflows.9.3
- Parasoft VirtualizeA broad service-virtualization suite for enterprise development and QA teams.8.9
- WireMockFlexible API virtualization with mocking, recording, stateful behavior, and fault simulation.8.8
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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