Loader.io is a load testing service that allows you to stress test your web-apps & apis with thousands of concurrent connections. It is a fully manageable data monitoring and assessment application. Loader is a fully centralized hub that gathers all the user's server feeds into one place and generates reports based on their performance. Loader also identifies potential threats within the user's website, applications and more. Users can also opt to receive notifications of when these threats are close to occurring.
Loader.io offers advanced analytics that are more in-depth, and are more detailed test results. This includes response times, and response codes for each URL in a test (free users only see aggregated stats for all URLs), response time and bandwidth histograms (much more informative than the averages you get for free). Some additional features are - Concurrent Tests, DNS Verification, Priority loaders, Priority Support etc.