# Locust vs BlazeMeter

> Locust is an open source, self-hosted load testing tool from Locust authors, scripted in Python. BlazeMeter is a commercial, vendor-hosted cloud load testing service from Perforce, scripted in Java, JavaScript, Python. The practical split is the cost model: Locust is open source, BlazeMeter is commercial.

- Canonical: https://perf.jmeter.ai/vs/locust-vs-blazemeter/
- Compared: [Locust](https://perf.jmeter.ai/tools/locust/) · [BlazeMeter](https://perf.jmeter.ai/tools/blazemeter/)

## Verdict
Both cover HTTP, HTTPS, WebSocket. On recorded coverage BlazeMeter is the wider of the two (4 protocols against 3), which matters only if your workload actually uses the extra ones. Budget and procurement usually settle Locust against BlazeMeter before any benchmark does. Run the same scenario on both before you standardize; the rows below only tell you what is true on paper.

## Specs
| Field | Locust | BlazeMeter |
| --- | --- | --- |
| Vendor | Locust authors | Perforce |
| Category | Load Testing | Cloud Load Testing |
| License | Open Source | Commercial |
| Deployment | Self-hosted | Cloud |
| Status | Active | Active |
| First released | 2011 | 2011 |
| Pricing | Free; MIT License. | Free tier and paid plans; contact vendor for enterprise pricing. |
| Scripting | Python | Java, JavaScript, Python |
| Protocols | HTTP, HTTPS, WebSocket | HTTP, HTTPS, WebSocket, JDBC |
| OS support | Windows, macOS, Linux | Browser |

## How to choose
- Choose Locust if you need a free, self-supported stack (Free; MIT License).
- Choose BlazeMeter if you can fund a commercial license for vendor support (Free tier and paid plans; contact vendor for enterprise pricing).
- Pick BlazeMeter to avoid operating injectors, Locust when residency or air-gapped runs rule a hosted service out.
- Only BlazeMeter records support for JDBC — one hard requirement there decides the pair on its own.
- Match the authoring language to the team: Locust means Python, BlazeMeter means Java, JavaScript, Python.
- Open the Test Rig to compare license, deployment, protocol and OS rows side by side.

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Curated by NaveenKumar Namachivayam (QAInsights) · methodology: https://perf.jmeter.ai/about/#methodology · corrections: https://github.com/QAInsights/Performance-Testing-Tools/issues/new?title=Tool%20submission%3A%20&body=Tool%20name%3A%20%0AOfficial%20URL%3A%20%0AWhat%20should%20be%20added%20or%20corrected%3F%20%0A