DebugBear

vs

Dynatrace

With WebPageTest you can run a free website speed test from around the globe using real browsers at consumer connection speeds with detailed optimization recommendations.

..

GTmetrix is free, web-based website performance monitoring tool. With GTmetrix you can see how your site performs, reveal why it's slow and discover optimization opportunities.

Over 1 million developers across 60,000 organization use Sentry to diagnose, fix, and optimize the performance of their code. Sentry is a commerical application monitoring platform that allow them to ship better software faster. 

Datadog is a SaaS-based monitoring service for cloud-scale applications, providing monitoring of servers, databases, tools, and services, through a unique data analytics interface. With Datadog dog you can spot problems in your applications faster, and move quickly to fix it.

With Rollbar you can roactively discover, predict, and remediate application errors with real-time, AI-assisted workflows. Rollbar is an error tracking platform for JavaScript, PHP, Ruby, Python, DotNet, Java and iOS. It's loved by developer and trusted by enterprises and allows you to deploy with confidence and deliver more value to your customers, faster.