Looks like K6 is basically Gatling but with a JS-based DSL while Gatling uses Scala (or anything JVM-based like Java/Groovy/Kotlin)... there's also Locust[1] wh

Looks like K6 is basically Gatling but with a JS-based DSL while Gatling uses Scala (or anything JVM-based like Java/Groovy/Kotlin)... there's also Locust[1] which is Python-based. What I really wanted was an interactive tool, like old LoadUI used to do (Wikipedia, nicely, still has the old screenshots which show how cool it used to look: https://en.wikipedia.org/wiki/LoadUI https://en.wikipedia.org/wiki/LoadUI)... because until you run tests, you just don't know what kind of load you can throw at the server (and whether you're hitting CPU/Memory/Bandwitdth limits instead of server limits). Visual Components were written in a scripting DSL (Groovy based) and dynamically loaded so you could change the code even while the test ran... really awesome stuff, a bit like coding in Lisp with a visual facade on top. Based on existing tools, it should be relatively easy to build something like that and I am surprised there seems to be nothing of the kind. I've always wanted to do it myself, maybe one day if no one else finally tackles the problem. [1] https://docs.locust.io/en/stable/ https://docs.locust.io/en/stable/