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Best Open Source Katalon Alternative

A curated collection of the 1 best open source and self-hosted alternatives to Katalon in 2026.

Looking for a free, privacy-friendly, or self-hosted replacement for Katalon in 2026? The top open-source alternative is Hercules — Hercules is the first open-source testing agent, enabling zero-code, zero-maintenance UI, API, security, accessibility, and visual validations..

Hercules

Hercules

★ 1,131

Hercules is the first open-source testing agent, enabling zero-code, zero-maintenance UI, API, security, accessibility, and visual validations.

Hercules preview

Hercules is the first open-source testing agent, enabling zero-code, zero-maintenance UI, API, security, accessibility, and visual validations.

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About Katalon

All-in-one test automation platform for web, API, mobile, and desktop apps that lets teams create, run, and report on tests without deep coding expertise.