Apps similar to hey include Apache JMeter, which is free and open source. Other options are locust, Gatling.io, Apache Benchmark and HailStorm. In total there are eight Benchmark Tools like hey for Linux, Windows, Mac, self-hosting and the web.
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.
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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.
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.
ab is a tool for benchmarking your web server. It is designed to give you an impression of how your current web server installation performs. This especially shows you how many requests per second your web server installation is capable of serving.
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Siege is a regression test and benchmark utility. It can stress test a single URL with a user defined number of simulated users, or it can read many URLs into memory and stress them simultaneously.
Kraken is a load testing IDE. Kraken provides a complete development environment to software programmers and load testers that seek to make the most out of Gatling.
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