WebPageTest
This article is a stub. You can help the IndieWeb wiki by expanding it with relevant information.
WebPageTest is a web performance testing platform known for its incredibly detailed waterfall charts and number of options including scripting.
The project is built on open source - https://github.com/catchpoint/WebPageTest - but the instance provided by the company operating it has been popular.
Criticism
After being acquired by a larger company, the product seemed to be de-emphasized a great deal. A very large UI change in 2025/2026 led to a large amount of criticism about its quality.