I like most about loader.io, it's ease of use and its free for all features. It has an easy interface which makes loading tests very simple. There are some bugs in the website but they're being fixed every day so keep checking their site updates regularly to be updated regarding changes. If you want to create automated loads without any coding or scripting then Loader.IO can help you out. You don't have to worry much as it will do all the heavy lifting for you. We were able to automate our application loads by using Loader.IO.