Gomez is one of the only APM tools available that allows you to monitor performance from first mile (your data center) to last mile (your user’s browser). Gomez offers load testing, internet backbone performance monitoring, automated testing (anyone who’s used Selenium or QTP will find the interface very familiar), and performance and error level alerting. Compuware also recently introduced dynaTrace / PurePath, which gives you automatic transaction path detection, object level performance monitoring and allows you to get very granular with your transaction performance metrics. Gomez is also one of the most mature products out there, and has become the APM industry standard. It’s a great tool, but it’s priced by measurement, which means if you’re implementing RUM tags, synthetic tests, and dynaTrace, it can get very pricey for a high traffic site. Depending on your requirements, you might get what you need from some of the less expensive tools below.