https://github.com/dtolnay/star-history
Here is a side-by-side comparison of graphs generated by star-history.com vs my tool: https://github.com/dtolnay/star-history/issues/8
You can distinguish a lot finer structure in my graph: coinciding with individual blog posts with not as much reach as something on Hacker News front page. That structure is almost entirely concealed in star-history.com by the cartoony graphs.