Tideways PHP Profiler Extension

The Tideways PHP Profiler Extension (GitHub) a free and open source maintained drop-in replacement for XHProf or UProfiler that has support for PHP7, Windows and Linux and is actively maintained. But this is not just a drop-in replacement for XHprof or UProfiler, Tideways provides a cloud service where you can collect, monitor and analyze your profiling sessions. If you want to stay on the cheap side, you can still use any of the free XHprof and UProfiler compatible tools such as XHGUI.