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What is the difference between jPerf, iPerf, and qPerf?

JPerf vs. iPerf vs. qPerf

Speed, efficiency, and reliability of our network systems are more important than ever. These factors significantly impact every aspect of our personal and professional lives. Therefore, to ensure optimal network performance, we need to have the right tools for network testing. Three tools, iPerf, jPerf, and qPerf, stand out due to their popularity and effectiveness. We will delve into these tools, their functionality, and the key differences between them.

What is an iPerf test?

iPerf is a widely used, versatile network testing tool that measures the maximum achievable bandwidth on IP networks. It allows network engineers to tune various parameters associated with TCP and UDP to conduct comprehensive network performance tests.

iPerf is a command-line driven software, which means you initiate and control the tests by typing specific commands. It offers flexibility and control over the testing parameters, making it a popular choice among network experts and engineers.

iPerf tests the speed of both wired and wireless networks. iPerf offers two options for your tests: TCP traffic, typically used for tasks like browsing the internet or sending emails, and UDP traffic, which is used for activities like voice over IP calls or video streaming.

Despite iPerf’s flexibility and robustness, its command-line interface can be challenging to navigate for some users. However, NetAlly has simplified this process. The user-friendly screen on NetAlly’s handheld network testers simplifies the process of conducting an iPerf test, making it a tool that’s easy to use for a wide audience.

What is a jPerf test?

jPerf stands as a testament to the power of user-friendly design. It is essentially iPerf, but with a Java-based graphical user interface (GUI). This design allows users to enjoy the robust testing capabilities of iPerf without having to memorize or input any commands manually. Instead, users can navigate the software using the GUI, making the testing process more straightforward and accessible.

jPerf offers the same functionality as iPerf. However, its user-friendly interface makes it a more appealing choice for those who prefer a GUI. Despite these advantages, jPerf is limited to Windows and Mac operating systems. There are no versions for iOS or Android, which can be a constraint for those wanting to test on these platforms. NetAlly tools also provide a bit more information than jPerf, such as a graph over time to show how the speeds changed during the test.

What is a qPerf test?

qPerf is another network performance measurement tool. It shares similarities with iPerf and jPerf but also has distinct features that set it apart.

Unlike iPerf and jPerf, which are more general-purpose tools, qPerf is specifically designed to validate speeds between servers using the RDMA protocol. It boasts a command-based system like iPerf and provides more options, making it a bit more complex.

qPerf is only available for Red Hat Linux operating systems. Although this operating system was popular two decades ago, its usage has declined, limiting the reach of qPerf.

Despite these limitations, qPerf is a powerful tool for those needing to validate speeds between servers. It shares the core functionality of iPerf and jPerf but adds an additional layer of server-to-server speed validation, making it a valuable tool for server environments.

Summary of the differences

iPerf, jPerf, and qPerf all serve the same purpose – network performance testing. However, they differ in their design, functionality, purpose and ease of use.

iPerf is a versatile tool that supports various operating systems and provides a broad range of testing options. However, its command-line interface may be challenging for those unfamiliar with such systems. NetAlly has addressed this issue by incorporating a user-friendly interface into all their performance testing tools. NetAlly offers a range of advanced network performance testing tools, including AirCheck™ G3, EtherScope® nXG, LinkRunner® 10G, AirMagnet® Survey PRO, and Test Accessory.

On the other hand, jPerf always offers a user-friendly interface, making it easy and fast for users to run tests. However, it is limited to Windows and Mac operating systems. This limitation may pose a challenge for users who wish to conduct tests on iOS or Android devices. It also provides less information than NetAlly tools, such as a graph over time to show how the speeds changed during the test.

qPerf focuses on measuring network speed between servers, making it more specialized than iPerf and jPerf. However, it is only available for Red Hat Linux operating systems, limiting its applicability.


In the realm of network performance testing, iPerf, jPerf, and qPerf each offer unique features to suit different needs. Understanding the differences between these tools can help you make an informed decision based on your specific requirements.

Therefore, choosing the right network testing tool depends on your specific needs, the operating systems you’re using, and your comfort level with command-line interfaces. Whether you need to test a wireless network, prefer a graphical interface, or need to validate server speeds, iPerf, jPerf, and qPerf offer robust solutions for network testing. By leveraging tools like NetAlly’s handheld network testers, you can conduct these tests efficiently and effectively, ensuring optimal network performance.

Watch how the iPerf App feature works on the AirCheck G3, EtherScope nXG, and CyberScope® Handheld Cyber Security Analyzer.

Author Bio –
Product Manager – Wireless

Julio Petrovitch is a product manager at NetAlly, plus a certified CWNA/CWAP/CWDP/CWSP. He’s worked with network design, testing and validation for more than 15 years. Throughout he’s career he has had the opportunity to work with multiple networking technologies, including POTS, DSL, Copper/Fiber Ethernet, Wi-Fi, Bluetooth, and BLE.