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Apache JMeter vs Locust: What are the differences?


Apache JMeter and Locust are both popular open-source performance testing tools used for load testing and measuring the performance of web applications. While they serve similar purposes, there are certain key differences that set them apart. This article aims to highlight these differences to help you make an informed choice between the two tools.

  1. Scripting Language: Apache JMeter uses BeanShell as its default scripting language, which allows users to write test scripts in Java-like syntax. On the other hand, Locust uses Python as its scripting language, providing a more versatile and familiar language for developers.

  2. Scalability: Apache JMeter is better suited for testing large-scale applications as it allows distributed testing by utilizing multiple load generator machines. In contrast, Locust is more lightweight and focuses on simulating user behavior from a single machine, making it ideal for smaller applications or scenarios where distributed testing is not required.

  3. Ease of Use: JMeter has a more complex and comprehensive user interface, offering a wide range of features and options. While this provides greater flexibility and control over testing scenarios, it also comes with a steeper learning curve. Locust, on the other hand, has a simpler and more intuitive user interface, making it easier for beginners to get started with load testing.

  4. Real-Time Monitoring: JMeter provides built-in plugins and listeners that allow real-time monitoring of resource utilization and performance metrics during the test execution. These plugins enable detailed analysis of test results and provide valuable insights into the performance of the application under different load conditions. In contrast, Locust has limited built-in monitoring capabilities and requires integration with external tools or plugins for real-time monitoring.

  5. Community Support: Apache JMeter has been around for a longer time and has a larger and more established community of users and contributors. This results in a vast amount of resources, documentation, and community support available for JMeter. Locust, being a relatively newer tool, has a smaller community but is growing steadily and has an active user base.

  6. Extensibility: JMeter provides a wide range of out-of-the-box features and plugins to extend its functionality, such as support for various protocols and data formats. Additionally, users can develop custom plugins using Java or other scripting languages. Locust, though relatively limited in terms of built-in features, allows users to write custom classes or functions using Python to tailor the load testing scenarios according to their specific needs.

In summary, Apache JMeter and Locust differ in terms of scripting language, scalability, ease of use, real-time monitoring capabilities, community support, and extensibility. The choice between the two tools depends on the specific requirements of the load testing project and the level of expertise of the testing team.

Advice on Apache JMeter and Locust
Ratan Sharmacharya
Needs advice
Apache JMeterApache JMeter

I have a team that is not heavy on programming skills. I am looking for a load testing tool that is easy to use. Preferably, the tool should be a record and playback tool without much programming. Also, the tool should be able to test APIs apart from web-based applications. What tool should I opt for?

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Replies (2)
Deepak Naik
Product Owner at Digite Infotech Private Limited · | 3 upvotes · 33.6K views

My choice would be Apache JMeter, It's free and opensource plus it comes with lots of plugins and extendability. Apache JMeter needs a small amount of a learning curve and a basic understanding of Network, Protocols (TCP/IP ports, HTTP(S) and REST/SOAP, etc.) for initial setup. But it doesn't require programming skills. it has a nice record and playback option. You can still carry on without the developer skillset if you follow these steps. 1. Take backup. 2. Start recording and interact with the application. 3. stop recording and save the test case. This will give you your test-bed, after this, after these steps, every time just do Restore from backup and then Playback and observer results.

If you have longer recordings then an understanding of how to modify the recorded scripts will come handy.

For some of the advanced features such as Configuring variables, implementing loops, throttling adding think time, and automating test scaling to the number of users will require good planning of test scenarios and a Developer experience but this is true for any tool (even

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Pepe Ruiz
Head of Content at · | 2 upvotes · 33.2K views

Disclaimer: I work at k6, and I recommend you try our tool.

It might require some coding skills, but we support a few options to record a user session to autogenerate the load test. Read How to record a browser session with k6 OSS.

The k6 Cloud also supports recording a user session with a Browser Extension. Additionally, it provides a Test Builder UI to generate a load test for testing APIs.

If you have questions or need help, you can ask on Slack and the Community forum.

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Pros of Apache JMeter
Pros of Locust
  • 5
    Requires no programming knowledge
  • 3
    Supports distributed
  • 2
  • 15
  • 11
    Supports distributed
  • 7
    Open source
  • 6
    Easy to use
  • 6
    Easy to setup
  • 4
  • 2
    Test Anything

Sign up to add or upvote prosMake informed product decisions

Cons of Apache JMeter
Cons of Locust
  • 1
    It's GUI-first
  • 1
    Too complicated
  • 1
    Bad design

Sign up to add or upvote consMake informed product decisions

- No public GitHub repository available -

What is Apache JMeter?

It is open source software, a 100% pure Java application designed to load test functional behavior and measure performance. It was originally designed for testing Web Applications but has since expanded to other test functions.

What is Locust?

Locust is an easy-to-use, distributed, user load testing tool. Intended for load testing web sites (or other systems) and figuring out how many concurrent users a system can handle.

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What companies use Apache JMeter?
What companies use Locust?
See which teams inside your own company are using Apache JMeter or Locust.
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What tools integrate with Apache JMeter?
What tools integrate with Locust?

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What are some alternatives to Apache JMeter and Locust?
TestRail helps you manage and track your software testing efforts and organize your QA department. Its intuitive web-based user interface makes it easy to create test cases, manage test runs and coordinate your entire testing process.
Simulate any user scenario for webapps, websites, mobile apps or web services. 100% Apache JMeter compatible. Scalable from 1 to 1,000,000+ concurrent users.<br>
Selenium automates browsers. That's it! What you do with that power is entirely up to you. Primarily, it is for automating web applications for testing purposes, but is certainly not limited to just that. Boring web-based administration tasks can (and should!) also be automated as well.
It is the only complete API development environment, used by nearly five million developers and more than 100,000 companies worldwide.
Gatling is a highly capable load testing tool. It is designed for ease of use, maintainability and high performance. Out of the box, Gatling comes with excellent support of the HTTP protocol that makes it a tool of choice for load testing any HTTP server. As the core engine is actually protocol agnostic, it is perfectly possible to implement support for other protocols. For example, Gatling currently also ships JMS support.
See all alternatives