Open-Source Testing · keploy

keploy

Keploy is an open-source API and integration testing platform that automatically generates tests and mocks by recording real traffic at the network layer using eBPF. It works language-agnostic and can capture database queries, streaming events, and external API calls to create deterministic offline test suites.

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Source: GitHub — github.com/keploy/keploy

18k

GitHub stars

2.3k

Forks

Primary language

Apache-2.0

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	keploy/keploy
Owner	keploy
Primary language	Go
License	Apache-2.0 — OSI-approved
Stars	18k
Forks	2.3k
Open issues	679
Latest release	v3.5.84 (2026-07-01)
Last updated	2026-07-08
Source	https://github.com/keploy/keploy

What keploy is

Go-based tool that uses eBPF for kernel-level traffic interception to record and replay API flows, database interactions (Postgres, MySQL, MongoDB), and message queues (Kafka, RabbitMQ) as executable test cases. Supports statement, branch, and API schema coverage analysis with AI-assisted test expansion.

Quickstart

Get the keploy source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/keploy/keploy.git2cd keploy3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Rapid Test Generation from Production Traffic

Record real user flows and convert them to executable tests without code changes. Ideal for teams needing fast test coverage from existing production or staging environments.

Infrastructure-Heavy Integration Testing

Mock complex dependencies (databases, Kafka, RabbitMQ, external APIs) deterministically. Enables isolated testing without provisioning real infrastructure in CI/CD pipelines.

API and Microservice Coverage Analysis

Calculate combined statement, branch, and API schema coverage across distributed systems. Useful for QA and developer teams balancing code quality and business logic validation.

Implementation considerations

eBPF requires Linux kernel support (typically kernel 4.15+); verify host kernel version and container runtime compatibility before production rollout.
Record-replay workflow requires capturing representative user flows; plan data collection strategy to ensure captured scenarios cover critical paths and edge cases.
Time-freezing feature used for deterministic replay—verify system clock handling does not conflict with time-sensitive application logic or external integrations.
Mock registry and cloud features mentioned but availability, SLA, and pricing in enterprise context require clarification with vendor.
Language and protocol coverage is broad but some proprietary protocol parsings noted as non-open-source; review dependency list for your stack before commitment.

When to avoid it — and what to weigh

Unit Test Replacement Need — Keploy focuses on API, integration, and E2E testing—not unit test generation. If your primary need is fine-grained unit test creation, consider tools like Pex or Diffblue.
Strict Sandbox Isolation Required — Keploy uses eBPF and network interception; teams requiring air-gapped or strictly isolated sandboxes may face deployment constraints in hardened environments.
Minimal Infrastructure or CI/CD Overhead Budgets — eBPF interception, time-freezing, and mock registry features add operational overhead. Organizations with tight resource constraints should evaluate trade-offs.
Legacy Windows-First Shop — eBPF is primarily Linux-based. Windows deployments may have limited or no eBPF support, requiring evaluation of workarounds.

License & commercial use

Licensed under Apache License 2.0 (Apache-2.0), a permissive OSI-approved license allowing commercial use, modification, and distribution with attribution and liability disclaimer.

Apache-2.0 permits commercial use without royalty or vendor lock-in. However, cloud features (mock registry, time-freezing, console) may have separate commercial terms not covered by the license. Review vendor's enterprise offerings for clarification on SLAs, support, and hosted service terms.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Adequate
License clarity	Clear
Deployment complexity	Moderate
DEV.co fit	Good
Assessment confidence	High

Security considerations

eBPF operates at kernel level—verify that process privileges, SELinux/AppArmor policies, and container capabilities align with security posture. Network traffic capture and mock replay could expose sensitive data (API keys, PII); ensure recorded traffic is encrypted, access-controlled, and compliant with data retention policies. Vendor security audits, vulnerability disclosure policy, and data handling for hosted cloud features require review. No exploit details or threat model provided in source data.

Alternatives to consider

Postman + Newman

Lower operational overhead for API testing; requires manual test authoring but no kernel-level interception or infrastructure virtualization. Better for smaller, simpler test suites.

VCR.py / Betamax

Language-specific HTTP record-replay libraries; simpler setup but limited to HTTP mocking and lack distributed infrastructure support (databases, queues). Suitable for single-service testing.

Wiremock / Mountebank

Standalone mock servers offering HTTP/gRPC stubbing with no infrastructure recording; more manual configuration but no eBPF dependency and easier Windows deployment.

Software development agency

Build on keploy with DEV.co software developers

Evaluate Keploy's record-replay and infrastructure virtualization capabilities for your team. Review kernel requirements, cloud feature terms, and CI/CD integration fit before pilot deployment.

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keploy FAQ

Do I need to modify application code to use Keploy?

No. Keploy uses eBPF to intercept traffic at the network layer, so it works code-less and language-agnostic. You only run your app with `keploy record` or `keploy test` commands.

What happens if my Linux kernel does not support eBPF?

eBPF requires Linux kernel 4.15+. Older kernels will not support Keploy. Verify kernel version before deployment; some container runtimes or hardened images may have restricted eBPF access.

Can Keploy replace all my existing tests?

Keploy excels at API, integration, and E2E testing but is not designed for unit tests. Use it to complement unit test suites and expand coverage of integration and API flows. Consider coverage metrics from the tool to prioritize test expansion.

What is included in the Apache-2.0 license vs. enterprise/cloud offerings?

Apache-2.0 covers the open-source agent and core record-replay functionality. Cloud features (mock registry, hosted console, time-freezing in some contexts) may require separate commercial terms. Contact vendor for clarity on enterprise support, SLAs, and hosted service pricing.

Software development & web development with DEV.co

DEV.co is a software development agency delivering custom software development services to companies building on open source. Our software developers and web developers design, integrate, and ship production systems — spanning web development, APIs, AI, data, and cloud. If keploy is part of your open-source testing roadmap, our team can implement, customize, migrate, and maintain it.

Ready to automate your API testing?

Evaluate Keploy's record-replay and infrastructure virtualization capabilities for your team. Review kernel requirements, cloud feature terms, and CI/CD integration fit before pilot deployment.

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