No. 7 of 20 ·Service Virtualization Software

Wilma

Web · Self-hosted

Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Wilma is ranked #7 of 20 in service virtualization software on Freedom251. It runs on Self-hosted, Web. There is a free plan.

Wilma plans and pricing

All plans

Wilma Free GPLv3.0 licensed software github.com · 30 Sept 2026

Compared on service virtualization software

Free plan: Yes
Deployment model: self_hosted
Stateful simulation: Yes
Fault injection: Yes
Database virtualization: No
Messaging virtualization: No
Record and replay: Yes

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The record

Purpose: Wilma combines a service stub with an HTTP/HTTPS transparent proxy for developing and testing applications that depend on other services.
Traffic handling: It can capture, decode, save, and forward HTTP/HTTPS traffic, including two-way SSL, or generate stub responses for requests.
Operating modes: Wilma can run as a proxy, a service stub, or in a mixed mode.
Stub configuration: Stub behavior is configured with JSON files, and multiple stub configurations can be used.
Message modification: Message interceptors can alter or analyze requests and responses in real time, and users can add their own interceptor classes.
Message search: Wilma Message Search provides search for request-response pairs logged by Wilma.
Integrations: Wilma provides a Java service library through Maven Central and a .NET service library through NuGet.
Distribution: The applications are available as Docker Hub images, GitHub release ZIP files, or builds created from source.
Runtime requirement: The Wilma application requires JRE 11, and Wilma Message Search requires JDK 11.
Use cases: The site describes use in development and test environments, including unit, integration, functional, and end-to-end testing, as well as manual testing.
Load behavior: When load rises, Wilma can disable message decoding and then disk logging, and it restores those operations as load returns to normal.
Log retention: Wilma has a scheduled process that deletes old message logs according to configurable settings.
Test scenarios: The maker describes use in unit, integration, functional, end-to-end, and performance testing, as well as manual tests.
Runtime configuration: Wilma's stub behavior is configured using JSON files, which can be uploaded or changed through its UI or service while it is running.
Price from: Free

Where it ranks on Freedom251

Best Service Virtualization Software in 2026#7 of 20

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Sources

epam.github.io/Wilma/· checked 30 Sept 2026
epam.github.io/Wilma/introduction.html· checked 30 Sept 2026
epam.github.io/Wilma/endusers/feature_list.html· checked 30 Sept 2026
epam.github.io/Wilma/endusers/index.html· checked 30 Sept 2026
github.com/epam/Wilma· checked 30 Sept 2026
epam.github.io/Wilma/contact.html· checked 30 Sept 2026