Apache JMeter is an open source Java application, designed to load test functional behavior and measure performance. Originally designed for testing Web Applications, it has since expanded to other test functions as well.




Flood.io is described as 'Cloud Based Load & Performance Testing' and is an website. There are more than 25 alternatives to Flood.io, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Self-Hosted apps. The best Flood.io alternative is Apache JMeter, which is both free and Open Source. Other great sites and apps similar to Flood.io are k6, locust, Loadster and Loader.io.
Apache JMeter is an open source Java application, designed to load test functional behavior and measure performance. Originally designed for testing Web Applications, it has since expanded to other test functions as well.




k6 is an open-source load testing tool. It's used to test the performance of websites, web apps, APIs and micro-services.

An open source load testing tool written in Python. Locust allows you to define user behaviour with Python code, and swarm your system with millions of simultaneous users.

Loadster is a full-featured load testing solution for websites, web apps, and web services. It's built for real web apps and effortlessly handles cookies, user sessions, custom headers, dynamic form data and more.
Loader.io is a simple cloud-based load testing service that allows you to stress test your web-apps & apis with thousands of concurrent connections. Made by the team behind SendGrid.

YandexTank is an extensible open source load testing tool for advanced linux users which is especially good as a part of an automated load testing suite.



OctoPerf is an enterprise-grade performance and load testing platform available as SaaS and on-premise, enabling engineering teams to simulate realistic traffic, identify bottlenecks, and validate application scalability at a lower cost than traditional enterprise tools.



Gatling is a software designed for load and performance testing of web applications, APIs, and services. The software enables users to simulate user traffic and analyze the behavior and responsiveness of systems under various load conditions.




Managed load testing platform built on k6, integrating performance testing into CI/CD pipelines, supporting frontend and backend scenarios, GUI test builder, browser recorder, and JavaScript scripting. Free tier offers virtual user hours, metrics, logs, traces, and observability.




Blitz makes load and performance testing of your web site, API, iPhone and Android and Facebook apps a fun sport.

LoadRunner is a software testing tool used to test applications, measuring system behaviour and performance under load. LoadRunner can simulate thousands of users concurrently using application software, recording and later analyzing the performance of key components of the...

Guardius is a Software as a Service (SaaS) company designed to streamline and automate various IT needs for companies that operate their own websites or manage their own infrastructure. It is crucial for companies to safeguard their websites and infrastructure against potential...




Scala language allows to define test scenarios in a very compressed and expressive language.