# 2 Best Open Source Alternatives for Katalon

Canonical: https://caniforkit.com/katalon
Last updated: 2026-11-07

Looking for the best open source alternative for Katalon? Compare 2 verified free and open source alternatives to Katalon (Keploy, Hercules) with license details, self-hosting requirements, and practical trade-offs.

## Katalon Overview & Subscription Cost
- **Product**: Katalon
- **Category**: [dev tools](https://caniforkit.com/category/dev-tools)
- **Paid Subscription Price**: $25/month per seat
- **1-Seat Annualized Cost**: $300/year
- **5-Person Team Annualized Cost**: $1,500/year
- **10-Person Team Annualized Cost**: $3,000/year
- **Can I Vibe-Code / Rebuild It Myself?**: NO (use a free alternative, save the tokens)
- **Rebuild Verdict**: Instead of paying recurring SaaS fees for Katalon or rebuilding it from scratch, deploy one of the 2 battle-tested open-source alternatives like Keploy.

## Verified Free & Open Source Alternatives

| Alternative | Type | License | Runs On | GitHub Stars | Head-to-Head |
| --- | --- | --- | --- | --- | --- |
| [Keploy](https://caniforkit.com/fork/keploy) | Open Source | Open Source | Self-host | ★ 19.5k | [Compare vs Katalon](https://caniforkit.com/vs/katalon-vs-keploy) |
| [Hercules](https://caniforkit.com/fork/hercules) | Open Source | Open Source | Local | ★ 1.2k | [Compare vs Katalon](https://caniforkit.com/vs/katalon-vs-hercules) |

## In-Depth Alternative Profiles

### Keploy
- **Fork Page**: [Keploy Profile](https://caniforkit.com/fork/keploy)
- **Head-to-Head Comparison**: [Katalon vs Keploy](https://caniforkit.com/vs/katalon-vs-keploy)
- **Official Website**: https://keploy.io/
- **Source Code Repository**: https://github.com/keploy/keploy
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 19.5k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: Captures real API traffic and dependency calls via eBPF to generate tests and mocks automatically, then replays them in CI to catch regressions before they ship.
- **The Catch vs Katalon**: Requires self-hosting setup, updates, and server maintenance compared to managed Katalon.
- **Installation**: Clone https://github.com/keploy/keploy or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Hercules
- **Fork Page**: [Hercules Profile](https://caniforkit.com/fork/hercules)
- **Head-to-Head Comparison**: [Katalon vs Hercules](https://caniforkit.com/vs/katalon-vs-hercules)
- **Official Website**: https://testzeus.com/hercules
- **Source Code Repository**: https://github.com/test-zeus-ai/testzeus-hercules
- **License**: Open Source
- **Runs On**: Local
- **GitHub Stars**: 1.2k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: desktop, cross-platform, one-click install
- **Summary**: Hercules is the first open-source testing agent, enabling zero-code, zero-maintenance UI, API, security, accessibility, and visual validations.
- **The Catch vs Katalon**: Community-driven open source project without dedicated enterprise SLAs.
- **Installation**: Clone https://github.com/test-zeus-ai/testzeus-hercules or deploy with Docker Compose
- **Setup**: Download the native package or installer for your operating system.
- **Data Storage**: All application data lives locally on your own machine.

## Frequently Asked Questions

### What is the best free alternative to Katalon?
The top free alternative to Katalon is Keploy (open source, Open Source). Captures real API traffic and dependency calls via eBPF to generate tests and mocks automatically, then replays them in CI to catch regressions before they ship. Other popular Katalon replacements include Hercules.

### How much does switching from Katalon to a free alternative save?
Katalon starts at $25/month per seat ($300/year). Switching a 5-person team to a free alternative like Keploy saves $1,500 per year in software subscription fees.

### What is the catch when switching away from Katalon?
While Keploy replaces core Katalon features without subscription fees, the real-world trade-off is: Requires self-hosting setup, updates, and server maintenance compared to managed Katalon.

## Related

- [dev tools Software Category Hub](https://caniforkit.com/category/dev-tools)
- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)
- [Self-Hosted Software Directory](https://caniforkit.com/self-hosted)
- [Homepage](https://caniforkit.com)