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Katalon Studio alternatives: 5 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave Katalon Studio: expensive per-seat paid plans, and heavy for simple request testing. We ranked 5 alternatives by how directly each one replaces Katalon Studio, then by reviews, real visits and how recently each app's facts were checked against its own website. SoapUI currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Apidog logoApidogFree plan + paidNoWeb, Windows, macOS +24 of 457.2
2Postman logoPostmanFree plan + paidNoWeb, Windows, macOS +10 of 351.3
  1. Apidog logo

    1. ApidogTop pick

    Best for: Teams that want API design, testing, mocks and docs in a single tool

    Free plan + paidSelf-hostableWeb, Windows, macOS, Linux, Self-hosted

    57.2

    score / 100

    Why switch from Katalon Studio

    API-focused design, testing and mocking at a lower cost.

    Pros

    • Design, debugging, mocking, testing and docs together
    • Imports from Postman and Insomnia
    • On-premises edition available
    • EU data region

    Cons

    • Busy interface with a learning curve
    • Collaboration relies on the cloud service
    • Main website needs JavaScript, so details are hard to check
    Visit Apidog Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Apidog a good Katalon Studio alternative?

    Verified facts

    4 of 4 verified
    Mocking
    Smart and custom mocks
    Checked Oct 25, 2026docs.apidog.com(opens source in a new tab)
    Self-hosting
    On-premises edition
    Checked Oct 25, 2026docs.apidog.com(opens source in a new tab)
    Data location
    EU option
    Checked Oct 25, 2026docs.apidog.com(opens source in a new tab)
    Response validation
    Against your schema
    Checked Oct 25, 2026docs.apidog.com(opens source in a new tab)
  2. Postman logo

    2. Postman

    Best for: Teams that want a full API lifecycle platform

    Free plan + paidWeb, Windows, macOS, Linux

    51.3

    score / 100

    Why switch from Katalon Studio

    Easier API testing with collections, monitors and team workspaces.

    Pros

    • Covers design, testing, docs and monitoring
    • Supports REST, GraphQL, gRPC
    • Huge public API network

    Cons

    • Pushes cloud accounts and sync
    • Heavy for simple request testing
    Visit Postman Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1530
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Postman a good Katalon Studio alternative?

    Verified facts

    0 of 3 verified
    Free plan
    Yes
    Not checked yetpostman.com(opens source in a new tab)
    Protocols
    REST, GraphQL, gRPC, WebSocket
    Not checked yetpostman.com(opens source in a new tab)
    Platforms
    Web, Windows, macOS, Linux
    Not checked yetpostman.com(opens source in a new tab)

The best Katalon Studio alternative for…

The highest-ranked app in this list for each need.

SoapUI logo

Best Katalon Studio alternative for most people

SoapUI

Free, open-source API functional testing for REST and SOAP.

Karate logo

Best Katalon Studio alternative for a free option

Karate

Open-source framework for API, UI and performance tests in one syntax.

Apidog logo

Best Katalon Studio alternative for a free plan you can upgrade

Apidog

API-focused design, testing and mocking at a lower cost.

Hurl logo

Best Katalon Studio alternative for open source

Hurl

Lightweight plain-text API tests for CI pipelines.

Apidog logo

Best Katalon Studio alternative for self-hosting

Apidog

API-focused design, testing and mocking at a lower cost.

Postman logo

Best Katalon Studio alternative for Mac

Postman

Easier API testing with collections, monitors and team workspaces.

SoapUI logo

Best Katalon Studio alternative for Windows

SoapUI

Free, open-source API functional testing for REST and SOAP.

SoapUI logo

Best Katalon Studio alternative for Linux

SoapUI

Free, open-source API functional testing for REST and SOAP.

Apidog logo

Best Katalon Studio alternative for working in the browser

Apidog

API-focused design, testing and mocking at a lower cost.

Katalon Studio alternatives: common questions

What is the best alternative to Katalon Studio?

SoapUI ranks first right now. Free, open-source API functional testing for REST and SOAP. Karate and Apidog follow it in our ranking.

Is there a free alternative to Katalon Studio?

Yes. SoapUI (open source), Karate (open source), Apidog (free plan + paid) and Hurl (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Katalon Studio?

Yes: SoapUI, Karate and Hurl.

Which Katalon Studio alternatives work on Linux?

SoapUI, Karate, Apidog, Hurl and Postman run on Linux.

Why do people switch from Katalon Studio?

The complaints we hear most: expensive per-seat paid plans; heavy for simple request testing; free version limited to one local user.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Katalon Studio, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.