STATIC COMPARISON / TIER B
Locust vs The Grinder
Answer Locust is an open source, self-hosted load testing tool from Locust authors, scripted in Python. The Grinder is an open source, self-hosted load testing tool from The Grinder project, scripted in Jython, Java. It is discontinued. The practical split is the authoring language: Python for Locust, Jython, Java for The Grinder.
Curator verdict
Both cover HTTP, HTTPS, and both sit in the load testing tool bracket. On recorded coverage Locust is the wider of the two (3 protocols against 2), which matters only if your workload actually uses the extra ones. The Grinder is discontinued with nGrinder named as its successor, so Locust is the safer default for new work. Team language and existing tooling usually settle Locust against The Grinder. Run the same scenario on both before you standardize; the rows below only tell you what is true on paper.
Spec matrix
| Field | Locust | The Grinder |
|---|---|---|
| Vendor | Locust authors | The Grinder project |
| Category | Load Testing | Load Testing |
| License | Open Source | Open Source |
| Deployment | Self-hosted | Self-hosted |
| Status | Active | Discontinued |
| First released | 2011 | 2003 |
| Pricing | Free; MIT License. | Free; open-source license (see project). |
| Scripting | Python | Jython, Java |
| Protocols | HTTP, HTTPS, WebSocket | HTTP, HTTPS |
| OS support | Windows, macOS, Linux | Windows, macOS, Linux |
How to choose
- Only Locust records support for WebSocket — one hard requirement there decides the pair on its own.
- Match the authoring language to the team: Locust means Python, The Grinder means Jython, Java.
- The Grinder is discontinued; migrations off it usually land on nGrinder.
- Open the Test Rig to compare license, deployment, protocol and OS rows side by side.
Need more than two tools or a shareable matrix? Use the live Test Rig from the directory compare tray.
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