These days https://k6.io/ https://k6.io/ on command-line. It's open source and you can push the results into their cloud offering for visualization (I haven't t

These days https://k6.io/ https://k6.io/ on command-line. It's open source and you can push the results into their cloud offering for visualization (I haven't tested that yet). https://loader.io/ https://loader.io/ has visualization included but the setup usually takes me more time, e.g. generating 10.000 random queries (for a search engine). They have a limit (3 or 5 megabyte, can't remember) on the maximum payload size and I regularly hit the limit. They host on AWS US East coast exclusively which added a tiny bit of latency when testing services in Europe.