Keploy vs SoapUI
Keploy auto-generates API tests from real production traffic using eBPF with zero code changes. SoapUI is a dedicated API testing tool for manually creating and running SOAP and REST test cases with assertions, data-driven testing, and Groovy scripting. Keploy excels at zero-effort regression coverage; SoapUI excels at detailed protocol-level test authoring.
How They Work Differently
Architectural differences that affect your team's workflow, cost, and velocity.
KeployKeploy uses eBPF to record real API calls and responses from your running application, then replays them as regression tests. It auto-generates mocks for downstream dependencies and normalizes non-deterministic fields automatically. No Groovy scripts or manual test creation needed.
SoapUISoapUI provides a desktop application for building SOAP and REST API tests. Testers create test suites with individual test steps, add assertions for response validation, use Groovy scripts for complex logic, and configure data-driven testing with external data sources. The open-source version is free; SoapUI Pro adds a visual editor and reporting.
How They Compare
Click any row to see real-world KPI impact across industries.
KeployOpen Source · 17K+ Stars
SoapUIWhen to Use Each Tool
Specific scenarios where each tool delivers the most value for your engineering team.
Keploy is the better fit when you need to...
- Want to generate regression tests from production traffic without writing test scripts
- Need automatic mock generation for databases and external services
- Do not need SOAP-specific protocol testing features
- Prefer a modern, lightweight tool over a heavy desktop application
- Want open-source tooling without feature-gated commercial versions
SoapUI is the better fit when you need to...
- Need dedicated SOAP/WSDL testing with XML assertion capabilities
- Want a mature desktop tool with a long track record in enterprise QA
- Require Groovy scripting for complex test logic and data manipulation
- Need WS-Security, MTOM, and other SOAP-specific protocol features
- Your QA team is already proficient in SoapUI project structures
Real-World Scenarios
How each tool handles the challenges your team actually faces.
Your team ships 50 PRs/week and needs regression coverage
Keploy captures traffic automatically and runs tests on every PR in CI. No one writes or maintains Groovy scripts. Coverage grows organically with real usage patterns.
SoapUI requires QA engineers to manually build and maintain test suites. At 50 PRs/week, the test maintenance burden grows quickly, especially when test data and assertions need frequent updates.
You're migrating from monolith to microservices
Keploy records monolith API traffic, auto-generates dependency mocks, and replays against new services. Behavioral parity checking is automatic and requires no manual WSDL mapping.
SoapUI can test both SOAP monolith and REST microservice endpoints. Its MockService can virtualize legacy services during migration. But you must manually create each mock and test case.
New developer onboarding — writing first tests
New developers run the app with Keploy and get tests from real traffic in minutes. No SoapUI project structure or Groovy syntax to learn.
SoapUI's interface is familiar to experienced QA engineers but has a steep learning curve for developers new to the XML-heavy project structure and Groovy scripting.
FAQs
SoapUI supports REST testing, but its origins are in SOAP/XML. The interface reflects that heritage. For teams working exclusively with REST/JSON APIs, Keploy or more modern tools may be a better fit. SoapUI remains strong for organizations with significant SOAP infrastructure.
Keploy captures traffic at the network level and can record SOAP API calls. However, it does not provide SOAP-specific features like WSDL parsing, WS-Security, or XML-specific assertions. For deep SOAP testing, SoapUI is purpose-built.
SoapUI Open Source is free and provides core SOAP/REST testing. SoapUI Pro (now part of ReadyAPI) adds a form-based editor, Excel data sources, reporting, and support. Keploy's open-source version includes all core features without a commercial tier gating functionality.
Keploy tests auto-update when you re-record traffic, so maintenance is minimal. SoapUI tests require manual updates when APIs change — assertions, test data, and Groovy scripts all need human attention.
Yes. SoapUI provides a command-line runner and Maven plugin. However, setting up SoapUI in CI requires installing the runner and managing project files. Keploy's CLI is lighter and designed CI-first.
Looking for a SoapUI Alternative?
Engineering teams evaluating SoapUI alternatives often compare it with Keploy for API testing and regression coverage. Keploy captures real production traffic via eBPF and auto-generates tests with dependency mocks — requiring zero code changes. If you're considering switching from SoapUI or comparing SoapUI and Keploy side by side, the key differences come down to how tests are generated (traffic-based vs manual), how dependencies are mocked (automatic vs configured), and what infrastructure changes are needed (none vs SDK/sidecar/containers).
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