I used ggplot2 and gganimate in R. The custom ggplot2 theme is called theme_roboto(): https://github.com/juliasilge/silgelib/blob/master/R/graphin...

Almost certainly ggplot2 in R.

Also, the author says in the comments that he used ggplot2 for the static plots and gganimate for the animations.

The color palettes in charts with 2, 3, 4 colors are the ggplot2 defaults, and the author David Robinson has written packages that fit into the "tidyverse" of which ggplot2 is a part, so that seems quite likely.