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Keploy: Open Source Alternative to Postman, Mabl and ReadyAPI

Home/Categories/Developer Tools/Keploy

Keploy

Open source alternative to Postman, Mabl and ReadyAPI

An AI-powered open-source testing tool that generates test cases and mocks for unit, integration, and API testing, increasing test coverage.

image of Keploy

Contents

01Who Keploy is for

Repository

Stars: 17.2K
Forks: 2.2K
License: Apache-2.0
Latest: v3.5.38
Last commit: 19 days ago
Last verified: May 13, 2026
Repo: keploy/keploy ↗

Additional details

17.2K starsGoApache-2.0Active this month

Visit website GitHub repo

02

The problem it solves

03How it solves it

04Strengths and trade-offs

05Keploy vs alternatives

08Similar open-source tools

TL;DR

Keploy is an Apache-2.0 testing tool that records API traffic and turns it into test cases and mocks. It replaces manually maintained API regression tests for backend teams that want real traffic to become repeatable test coverage.Apache-2.0 · Go · 17.2K stars · Active this month

who it's for

Who Keploy is for#

Backend teams adding regression coverage

Use Keploy to capture real API paths and build repeatable tests around behavior that already matters.

Skip if:

Skip if your service interfaces are not stable enough for recorded tests to stay useful.

QA teams mocking dependency-heavy services

Keploy can reduce the work needed to test APIs that depend on databases and external services.

Skip if:

Skip if your test strategy requires fully hand-authored acceptance scenarios only.

the problem

The problem it solves#

how Keploy solves it

How it solves it#

Traffic-to-test generation

Captures API calls and dependencies, then converts them into repeatable test cases that reflect real system behavior.

Mock generation

Creates mocks from recorded dependencies so tests can run without every external service or database path live.

CI-friendly regression testing

Fits backend CI workflows where recorded tests should catch behavior changes before deploy.

strengths · trade-offs

Strengths and trade-offs#

Strengths

Reduces manual fixture workKeploy helps teams turn real API behavior into tests instead of writing every request, response, and mock by hand.
Open source testing workflowApache-2.0 licensing lets backend teams inspect and adapt the test-generation layer inside their CI process.

Trade-offs

-Generated tests still need curationRecorded traffic can include noisy or low-value cases. Teams must review fixtures and avoid treating every generated test as a meaningful contract.

versus alternatives

Keploy vs alternatives#

tech stack · detected from GitHub

What it's built on#

Languages: Go
Frameworks: Flask

frequently asked

FAQ#

Is Keploy open source?

Yes. Keploy is open source under the Apache-2.0 license.

What does Keploy do?

Keploy records API traffic and dependencies, then generates test cases and mocks for regression testing.

How does Keploy compare to Postman?

also worth a look

Similar open-source tools#

Echolon

Local-first API client for HTTP, REST, and GraphQL

49TypeScriptMIT

Octrafic

AI-powered CLI for automated API testing with natural language

Hoppscotch

Open source Postman alternative for REST and GraphQL testing

79.2KTypeScriptMIT

Yaak

Local-first API client for HTTP, GraphQL, and WebSocket

18.6KTypeScriptMIT

DeepSeek TUI

A coding agent that lives in your terminal.

Goose

Run repeatable multi-step coding workflows from CLI or desktop

45.1KRustApache-2.0

Language: Go
Open issues: 634
Contributors: 119
First release: 2022

Categories

Developer Tools AI & Machine Learning DevOps & CI/CD

Tags

Testing AI Coding Assistant Developer Tools CI/CD Platforms API Development Tools LLM Coding Open Core

Backend teams know they need regression tests, but writing and maintaining them by hand is slow. API behavior changes across services, databases, queues, and third-party calls, and mocks drift away from how the system behaves in production.

The result is a testing gap: teams either ship with too little coverage or spend heavy engineering time updating test fixtures after every integration change.

Keploy vs Postman

Keploy and Postman both touch API testing, but they start from different workflows. Postman is a request client and collaboration platform; Keploy records real traffic and turns it into regression tests and mocks.

Keploy is better when the goal is automated backend regression coverage from existing behavior. Postman is still better for exploratory API calls, documentation, and manual team collaboration around collections.

Postman is a broad API client and collaboration platform. Keploy focuses on turning real backend traffic into automated tests and mocks.