Keploy vs Microcks
Keploy auto-generates API tests from real production traffic using eBPF with zero code changes. Microcks is an open-source platform for API mocking and testing that generates mocks and tests from OpenAPI, AsyncAPI, gRPC, GraphQL, and SOAP specifications. Keploy tests real behavior; Microcks tests spec compliance and provides mock services for development.
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 handles non-deterministic data automatically. Tests are based on what actually happened, not what a spec says should happen.
MicrocksMicrocks imports API specifications (OpenAPI, AsyncAPI, gRPC protobuf, Postman collections) and auto-generates both mock services and contract tests from them. Teams use Microcks mocks during development to avoid dependency on real services, and contract tests in CI to verify implementations match specs. It runs as a Kubernetes-native service.
How They Compare
Click any row to see real-world KPI impact across industries.
KeployOpen Source · 17K+ Stars
MicrocksWhen 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 tests from real traffic, not from spec files
- Need tests that reflect actual production behavior, not spec compliance
- Do not have comprehensive API specifications for your services
- Prefer traffic-based mock generation over spec-based mock generation
- Want a simpler setup without Kubernetes deployment requirements
Microcks is the better fit when you need to...
- Follow a spec-first API development approach with OpenAPI or AsyncAPI
- Need mock services for async APIs (Kafka, AMQP, MQTT) alongside REST
- Want contract testing that validates implementation against specs
- Need Kubernetes-native deployment with Operator support
- Work with event-driven architectures needing AsyncAPI mock support
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 and generates regression tests that run in CI automatically. Tests reflect actual usage patterns and need no spec maintenance.
Microcks validates each PR against API specs. Coverage is limited to what the spec defines. If specs are incomplete or outdated, test coverage has gaps.
You're migrating from monolith to microservices
Keploy records monolith traffic, generates dependency mocks, and verifies new microservices. No specs needed for legacy APIs.
Microcks provides mock services for new microservice dependencies based on specs. This is excellent for parallel development but requires writing specs for each new service boundary.
New developer onboarding — writing first tests
New developers run the app with Keploy and get production-based tests immediately. No spec files or Kubernetes knowledge needed.
Microcks helps new developers by providing mock services they can develop against. They learn API contracts from the spec-generated mocks, but need to understand the spec-first workflow.
FAQs
They overlap in API testing but approach it differently. Keploy generates tests from real traffic (behavior-based). Microcks generates tests and mocks from specs (contract-based). Keploy catches actual regressions; Microcks catches spec violations.
Yes. Microcks uniquely supports AsyncAPI for mocking and testing event-driven services (Kafka, AMQP, MQTT, WebSocket). Keploy focuses on synchronous API traffic. If you need async API testing, Microcks has stronger support.
Yes. Microcks is a CNCF Sandbox project, which signals Kubernetes-native design and cloud-native community adoption. Keploy is an independent open-source project. Both are Apache 2.0 licensed.
Keploy generates mocks from real dependency responses — they reflect actual behavior. Microcks generates mocks from spec examples — they reflect intended behavior. Real traffic mocks may catch more edge cases; spec mocks are more predictable.
Yes. Use Microcks for spec-based mock services during development and contract validation. Use Keploy for regression testing from real traffic in later environments. They address different stages of the testing lifecycle.
Looking for a Microcks Alternative?
Engineering teams evaluating Microcks 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 Microcks or comparing Microcks 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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