Open Source Load Testing Tools
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Load Testing Tools
View 51 business solutionsBrowse free open source Load Testing tools and projects for Windows and Mac below. Use the toggles on the left to filter open source Load Testing tools by OS, license, language, programming language, and project status.
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MongoDB Atlas runs apps anywhereMongoDB Atlas gives you the freedom to build and run modern applications anywhere—across AWS, Azure, and Google Cloud. With global availability in over 115 regions, Atlas lets you deploy close to your users, meet compliance needs, and scale with confidence across any geography.
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Yeastar: Business Phone System and Unified CommunicationsUser-friendly, optimized, and scalable, the Yeastar P-Series Phone System redefines business connectivity by bringing together calling, meetings, omnichannel messaging, and integrations in one simple platform—removing the limitations of distance, platforms, and systems.
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k6
A modern load testing tool, using Go and JavaScript
The best developer experience for load testing. Open source and SaaS for engineering teams. Test early and continuously—break the QA silo in performance testing. Backend and frontend engineers prevent regressions when running performance tests. Test scalability to improve your reliability targets. Test SLOs and avoid SLA breaches. Shift left and collaborate with developers for effective and continuous testing. Use the same script for local, distributed, and cloud tests. Migrate from local tests to the cloud using the same script for both environments. Verify that applications can handle the expected traffic. Adapt your testing: stress tests, peak tests, soak tests, etc. Mix browser and API testing—interact with real browsers and collect frontend metrics to get a holistic user view. Simulate real-world traffic in your chaos experiments. Inject system failures in your k6 tests. -
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Apache JMeter
Load testing tool for analyzing and measuring performance of services
The Apache JMeter™ application 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. Apache JMeter may be used to test performance both on static and dynamic resources, Web dynamic applications. It can be used to simulate a heavy load on a server, group of servers, network or object to test its strength or to analyze overall performance under different load types. -
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ali
Generate HTTP load and plot the results in real-time
Generate HTTP load and plot the results in real-time. A load testing tool capable of performing real-time analysis, inspired by vegeta and jplot. ali comes with an embedded terminal-based UI where you can plot the metrics in real-time, so lets you perform real-time analysis on the terminal. Press l (or h) to switch the displayed chart. On all charts, you can click and drag to select a region to zoom into. -
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Fortio
Fortio load testing library, command line tool, advanced echo server
Fortio (Φορτίο) started as, and is, Istio’s load testing tool and later (2018) graduated to be its own open-source project. Fortio runs at a specified query per second (qps) and records an histogram of execution time and calculates percentiles (e.g. p99 ie the response time such as 99% of the requests take less than that number (in seconds, SI unit)). It can run for a set duration, for a fixed number of calls, or until interrupted (at a constant target QPS, or max speed/load per connection/thread). Fortio is a fast, small (4Mb docker image, minimal dependencies), reusable, embeddable go library as well as a command line tool and server process, the server includes a simple web UI and REST API to trigger run and see graphical representation of the results (both a single latency graph and a multiple results comparative min, max, avg, qps and percentiles graphs). -
Eurekos LMS - Build a Smarter CustomerEurekos is a purpose-built LMS that engages customers throughout the entire learning journey from pre-sales, to onboarding, and everything after.
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Locust
Scalable open source load testing tool
Locust is an open source user load testing tool written in Python. The idea behind Locust is to swarm your web site or other systems with attacks from simulated users during a test, with each user behavior defined by you using Python code. This swarming process is then monitored from a web UI in real-time, and will help identify any bottlenecks in your code before real users can come in. As it is completely event-based, Locust can have thousands or even millions of simultaneous users distributed over multiple machines swarming your system. Unlike other event-based apps, it doesn’t use callbacks but uses lightweight processes instead, so you can write very expressive scenarios in Python without complicating it with callbacks. -
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Vegeta
HTTP load testing tool and library. It's over 9000!
Vegeta is a versatile HTTP load testing tool built out of a need to drill HTTP services with a constant request rate. It can be used both as a command line utility and a library. You can install Vegeta using the Homebrew package manager on Mac OS X. Both the library and the CLI are versioned with SemVer v2.0.0. After v8.0.0, the two components are versioned separately to better isolate breaking changes to each. CLI releases are tagged with cli/vMAJOR.MINOR.PATCH and published on the Github releases page. As for the library, new versions are tagged with both lib/vMAJOR.MINOR.PATCH and vMAJOR.MINOR.PATCH. The latter tag is required for compatibility with go mod. The JSON format makes integration with programs that produce targets dynamically easier. Each target is one JSON object in its own line. The method and url fields are required. If present, the body field must be base64 encoded. The generated JSON Schema defines the format in detail. -
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Ddosify
High-performance load testing tool, written in Golang
vLoad tests should be done regularly to avoid being caught unprepared. Find out the maximum service capacity of your web system. Start the test either instantly or for a future date. Define your periodic load tests. Without load tests, businesses understand the load capacity of their systems when they become inaccessible during campaign times such as Black Friday or Cyber Monday. Determine the origins of requests and the test duration with our easy-to-use web interfaces. Review past load tests and general performance from our reports and charts. Adjust the origin of the requests from 100+ locations. Existing solutions are costly and limited. So we’ve developed a brand-new load generator. Customize your tests with scenarios on UI. Without a line of code! Insightful reports and charts to improve your service capability. -
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ESM
Tomorrow's ECMAScript modules today
esm is a JavaScript module loader that enables the use of ECMAScript modules (ESM) in Node.js environments, providing a seamless way to work with modern JavaScript syntax in older Node.js versions. -
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Zerocode
API automation and load testing framework
A community-developed, free, open source, microservices API automation and load testing framework built using JUnit core runners for Http REST, SOAP, Security, Database, Kafka and much more. Zerocode Open Source enables you to create, change, orchestrate and maintain your automated test cases declaratively with absolute ease. Zerocode makes it easy to create and maintain automated tests with absolute minimum overhead for REST,SOAP, Kafka Real Time Data Streams and much more. It has the best of best ideas and practices from the community to keep it super simple, and the adoption is rapidly growing among the developer/tester community. Zerocode is a modern lightweight, simple and extensible open-source framework for writing test intentions in simple JSON or YAML format that facilitates both declarative configuration and automation. Put simply, Zerocode alleviates pain and brings simplicity to modern API automation. -
Securden Windows Privilege ManagerRemove local administrator rights on Windows servers and endpoints. Seamlessly elevate applications for standard users. Grant time-limited rights on-demand. Control application usage by remote employees through whitelisting and blacklisting.
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dperf
DPDK based 100Gbps network performance and load testing software
dperf is a DPDK based 100Gbps network performance and load testing software. Based on DPDK, dperf can generate huge traffic with a single x86 server: tens of millions of HTTP CPS，hundreds of Gbps throughput and billions of concurrent connections. Provides detailed statistics and identify every packet loss. Support multiple scenarios. Load testing and stability testing for Layer 4 Load Balancer and other Layer 4 gateways. Network performance testing for servers on cloud. Performance test of network package processing capability for NIC and CPU. Can be used as a high-performance HTTP server or client for load testing. -
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LOIC-0
A NETWORK STRESS TOOL BASED ON PRAETOX LOIC
Low Orbit Ion Cannon - 0 (LOIC-0) The original Low Orbit Ion Cannon with interface improvements. ALSO NOTED VERSION 1.0 OF LOIC-0 IS VERSION 1.2 OF LOIC AND SO ON. DISCLAIMER: USE ON YOUR OWN RISK. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER OR CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES THIS TOOL IS RELEASED WITH NO WARRANTY AT ALL. TAGS: LOIC,Low Orbit Ion Cannon, network, stress test, security software, network tool, Windows,Linux, LOWC, Low Orbit Web Cannon, network, stress testing, load testing, server load testing, server testing.">
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The Grinder
Distributed load testing framework - Java, Jython, or Clojure scripts.
The Grinder is a load testing framework that makes it easy to run a distributed test using many load injector machines. Test scripts are written in Jython, and can call out to arbitrary Java code, providing support for testing a large range of network protocols. The Grinder comes with a mature plug-in for testing HTTP services, HTTP scripts can be recorded easily from a browser session.">
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r-u-dead-yet
R-U-Dead-Yet? (RUDY) Original source code files
R-U-Dead-Yet, or RUDY for short, implements the generic HTTP DoS attack via long form field submissions. RUDY attack targets web applications by starvation of available sessions on the web server. RUDY keeps sessions at halt using never-ending POST transmissions and sending an arbitrarily large content-length header value. Licensed under the GNU GPL v3 DISCLAIMER: USE ON YOUR OWN RISK. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER OR CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES THIS TOOL IS RELEASED WITH NO WARRANTY AT ALL. -
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Gatling Studio
Desktop app that helps you craft Gatling load-testing simulations
Gatling Studio is a native desktop application created to simplify the creation of Gatling load-testing simulations from real browser traffic. Instead of hand-writing scenarios in Scala or Java from scratch, you use Gatling Studio to drive a Chromium-based browser through a typical user journey. The tool captures all HTTP and HTTPS requests and responses, saves them as a HAR file, and then automatically converts that data into a structured Gatling project with groups, pauses, and exec blocks. It includes logic to filter out noisy or irrelevant requests such as font files, analytics beacons, and static assets, so the generated scenario focuses on the core business interactions. The output is a ready-to-run Gatling project (Java/Maven) that can be executed locally or uploaded to Gatling Enterprise to run at scale. Gatling Studio targets performance engineers and QA teams who want a low-code path from “record what a user does in the browser” to “run a realistic load test.” -
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GoReplay
The Swiss Army knife for testing and monitoring
Increase confidence in code deployments, configuration changes and infrastructure changes with GoReplay! GoReplay is an innovative open source tool that captures and replays live HTTP traffic, using it to continuously test your system with real data. Now you don’t have to put up with risks that come with putting a third-party component in the critical path. With GoReplay you can analyze and record your application traffic without affecting it whatsoever. Use it for shadowing, load testing, monitoring and detailed analysis. You can trust GoReplay to accurately emulate production environments so you can make changes and deploy with confidence. -
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LOIC-SLOW
LOIC-0 WITH SOME LOWBANDWITH NETWORK STRESSING TOOLS ADDED
LOIC-SLOW Low Orbit Ion Cannon- Special Lowbandwith Operating Weapon LOIC-SLOW stands for LOIC - Low Orbit Ion Cannon SLOW - Special Lowbandwith Operating Weapon THE NEXT GENERATION OF LOIC-0 DISCLAIMER: USE ON YOUR OWN RISK. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER OR CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES. THIS TOOL IS RELEASED WITH NO WARRANTY AT ALL. TAGS: LOIC, Low Orbit Ion Cannon, network, stress testing, load testing, server load testing, server testing. -
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The SoapUI download has moved to https://www.soapui.org/downloads/soapui/source-forge.html With more than 9 million downloads SoapUI is the de-facto standard for REST and SOAP API functional, security and performance testing.
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LOIC-IRC-0
LOIC-0 Now with IRC control
A new version of LOIC-0 with IRC control. Also LOIC SLOW with IRC control. PLEASE NOTE THAT THIS TOOL IS RELEASED UNDER GPLv3 LICENSE. DISCLAIMER: USE ON YOUR OWN RISK. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER OR CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES TAGS: LOIC, Low Orbit Ion Cannon, network, stress testing, load testing, server load testing, server testing, IRC, LOIC IRC. -
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GoldenEye
The GoldenEye HTTP DoS Test tool
GoldenEye is an python app for SECURITY TESTING PURPOSES ONLY! GoldenEye is a HTTP DoS Test Tool. Attack Vector exploited: HTTP Keep Alive + NoCache See README more details. Please note that this is a fork from the original at GitHub by https://github.com/jseidl Jan Seidl. And Official project link is https://github.com/jseidl/GoldenEye License This software is distributed under the GNU General Public License version 3 (GPLv3) DISCLAIMER: USE ON YOUR OWN RISK. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER OR CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES. -
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This is a HTTP traffic generator for load testing web applications. It is very simple and fast and can simulate client activity on multiple servers at the same time. Supports almost all http methods such as GET, POST, HEAD
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Addanc is a distributed/scalable system for stress/load testing web based applications. Addanc tests focus on the arrival rate of service requests rather than a fixed number of simulated clients.
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VNC for use with the BrowserMob Selenium JavaScript Validator. This tool is made available for users of BrowserMob FREE Website Monitoring and Load Testing. The BrowserMob Local Validation Service can be downloaded from https://browsermob.com/tools.
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JCrawler is a perfect cralwing/load-testing tool which is cookie-enabled and follows human crawling pattern (hit/second).
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Drill
Drill is an HTTP load testing application written in Rust
Drill is an HTTP load-testing application written in Rust. The main goal for this project is to build a really lightweight tool as an alternative to other that require JVM and other stuff. You can write benchmark files, in YAML format, describing all the stuff you want to test. It was inspired by Ansible syntax because it is really easy to use and extend. As you can see, you can play with interpolations in different ways. This will let you specify a benchmark with different requests and dependencies between them. Right now, the easiest way to get drill is to go to the latest release page and download the binary file for your platform. OpenSSL is needed in order to compile Drill, whether it is through cargo install or when compiling from source with cargo build. -
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JMeter is a load testing framework developed in Java. This plugin adds functionality to JMeter that logs results to a database, allowing for more effective reporting.