Ask HN: Fitness/Weight Tracking Website I Used to Use

This is an odd request but back around 2016-2017 I frequently used a specific website for tracking my weight. This website was recommended by someone on HN, and I remember the following distinctive details about it:

- It was started by the technical cofounder of a company that has since become an entrenched BigCo during the Dotcom era.

- The site creator chose to go with a mostly basic HTML layout without the use of many dependencies.

- The site's primary colors were I believe white and a shade of purple.

- It contained a very helpful chart which plotted out your average weight given a rolling past ten days of data.

- I think the name of the website was something along the lines of "The Programmer's Exercise Guide" but I vaguely recall the domain being the creator's name or abbreviation of it.

The site was very helpful and I would love to remember what it is again (and to bookmark it this time!). I have combed through my entire password manager and bookmarks list, but have come up short with anything that would have matched what I'm looking for.

Anyone have a guess?