BlazeMeter is a tool using which you can run fast performance tests. It runs the tests from real browsers. It is easy to scale and allows you to drive load across the globe through Amazon, Google etc. It can be easily integrated with your delivery pipeline and provides real-time reporting and comprehensive analytics.
NeoLoad offers 1 free plan and 4 paid plans. Free plan is best suited for developers and testers running small loads or performance tests. It lets you run an unlimited number of tests and can handle a load of 50 virtual users.Mobile App Stress Testing Tools Neo Load