Open Source Alternatives
  • Alternatives
  • Categories
    Categories by size882 projects
    • Developer Tools461
    • AI & Machine Learning404
    • Web Development196
    • Business & Productivity191
    • Communication & Collaboration126
    • Security & Monitoring126
    • IT Management123
    • Product & Project Management106
    • Cloud & Hosting105
    • Data & Analytics104
    Browse all 21 categoriesLLMOps & AI Tooling, Design & Creative and 9 more
  • Blog
  • Advertise
SearchNotion, Slack, password manager.../
Submit
Open Source Alternatives
  • Alternatives
    • Developer Tools461
    • AI & Machine Learning404
    • Web Development196
    • Business & Productivity191
    • Communication & Collaboration126
    • Security & Monitoring126
    • Browse all 21 categories
  • Blog
  • Advertise
Submit your project

New open source projects by email

The projects we add and every new guide. Free, unsubscribe any time.

Open Source Alternatives LogoOpen Source Alternatives

Handpicked Open Source Alternatives to Paid Softwares

Product

  • Categories
  • Tag
  • Advertise

Resources

  • Blog
  • Collection
  • Submit

Company

  • Privacy Policy
  • Terms of Service
  • Refund Policy
  • Sitemap

Alternatives

  • Claude Code
  • Jira
  • Notion
  • Slack
  • Linear
  • Wispr Flow
  • All alternatives
© 2026 Open Source Alternatives. All rights reserved.
Open SourceAlternatives
Home/Categories/Developer Tools/Keploy
icon of Keploy

Keploy

Open source alternative to Postman, Mabl and ReadyAPI

  • 18.7K stars
  • Apache-2.0
  • Active this week
  • Last commit 1 day ago

Last verified Oct 20, 2026

Generate API and integration tests from real traffic with Keploy, an Apache-2.0 tool that records requests, dependencies, and mocks for regression coverage.

Visit websiteGitHub18.7K stars
image of Keploy
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.

Read the full breakdownHide the full breakdownWho it is for, how it works, trade-offs and the FAQ
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#

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.

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#

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.

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?

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

also worth a look

Similar open-source tools#

Echolon

Alternative toPostman

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

  • 58 GitHub stars
  • MITLicence MIT

Octrafic

Alternative toPostman

AI-powered CLI for automated API testing with natural language

  • 35 GitHub stars
  • MITLicence MIT

Hoppscotch

Alternative toPostman

Open source Postman alternative for REST and GraphQL testing

  • 80,662 GitHub stars
  • MITLicence MIT

Yaak

Alternative toPostman

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

  • 19,338 GitHub stars
  • MITLicence MIT

Bifrost

Alternative toPortkey

Open-source AI gateway with 23+ providers, failover, and MCP support.

  • 8,975 GitHub stars
  • Apache-2.0Licence Apache-2.0

Duckle

Alternative toFivetran

Self-hosted ETL on DuckDB with 385 connectors and no per-row billing.

  • 1,517 GitHub stars
  • Apache-2.0Licence Apache-2.0
by category

Open source tools in these categories#

461

Developer Tools

REA (Reverse Engineer Anything), superpowers, Skills for Real Engineers
404

AI & Machine Learning

freeCodeCamp, OpenClaw, REA (Reverse Engineer Anything)
86

DevOps & CI/CD

Nvm, Uptime Kuma, Netdata

Featured

Inbox Zero

Alternative toSuperhuman

AI email assistant that drafts replies and clears your inbox

  • 12,712 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
  • #Email

rakazo

Alternative toGrok Bot

AI teammates you own: your keys, your model, your machine.

  • 4,904 GitHub stars
  • Apache-2.0Licence Apache-2.0
  • #AI Agents

Omnara

Alternative toCClaude Managed Agents

Open-source agent deployment API. Self-host or use Omnara Cloud.

  • 2,957 GitHub stars
  • Apache-2.0Licence Apache-2.0
  • #AI Agents
Feature your project

New open source projects by email

The projects we add and every new guide. Free, unsubscribe any time.

Find open source alternatives to paid software

/
  • Claude Code to OpenCode
  • Jira to Windshift
  • Notion to AppFlowy
  • Slack to Mattermost
  • Linear to GitLab
  • Wispr Flow to Handy
  • CapCut to Concat
  • Grok Bot to rakazo
  • Superhuman to Inbox Zero
  • Airtable to AITable
  • Muse to OpenClaw
  • GitHub Copilot to Cline
  • Datadog to Netdata
  • Microsoft Teams to Rocket.Chat
  • Pinecone to Qdrant
  • Zapier to n8n
  • Devin AI to OpenHands
  • Firebase to Supabase
  • 1Password to KeePassXC
  • Confluence to Docmost
  • Contentful to Strapi
  • Adobe Premiere Pro to Shotcut
  • ChatGPT to AnythingLLM
  • LangSmith to Langfuse
  • Claude Code to OpenCode
  • Jira to Windshift
  • Notion to AppFlowy
  • Slack to Mattermost
  • Linear to GitLab
  • Wispr Flow to Handy
  • CapCut to Concat
  • Grok Bot to rakazo
  • Superhuman to Inbox Zero
  • Airtable to AITable
  • Muse to OpenClaw
  • GitHub Copilot to Cline
  • Datadog to Netdata
  • Microsoft Teams to Rocket.Chat
  • Pinecone to Qdrant
  • Zapier to n8n
  • Devin AI to OpenHands
  • Firebase to Supabase
  • 1Password to KeePassXC
  • Confluence to Docmost
  • Contentful to Strapi
  • Adobe Premiere Pro to Shotcut
  • ChatGPT to AnythingLLM
  • LangSmith to Langfuse