Catchpoint released Speed Index as a new feature:
New Metric: Speed Index
Cortex -- Catchpoint's March 2017 release -- brought a new metric: Speed Index. Speed Index is a measure of visual completeness on the page, giving you greater insight into what users actually see when interacting with your web applications.
Speed Index is best used in conjunction with timing metrics such as Document Complete and Render Start. While those metrics are still important to measure, and will remain so, Speed Index is a new, valuable way to gauge the user experience.
Note: Speed Index is available for Catchpoint Web and Transaction tests running on the Chrome monitor. In order to capture Speed Index, the additional setting Capture Filmstrip must be enabled for the test.
We should check if we're billed for usage or if it we can use it "as much as we like" under our existing Catchpoint subscription.