I use calendar colors "semantically", such that the color of a calendar and its events tells me something about it (type, priority, etc). The built-in colors for Proton Calendar are utterly useless to me in this regard. I also find that the pastel colors blend in the Android app's month view, making events difficult to distinguish with a quick glance. Google's colors leave a lot to be desired, but they're miles better than Proton Calendar. Until I began using Proton Calendar, I hadn't realized how much I rely on the color "semantics" to make information stand out.

I really don't understand how someone puts in the work to add calendar colors, but then nerfs the feature by hard coding just 5 basic color groups, with 4 largely indistinguishable variations of each. Just add a color wheel! If there's some sick need to hard code a limited set of colors, then use fewer variations of more base colors, pick colors with greater differences between them, and include some primaries!

The default color palatte is fine, but I don't like the color choices for some of the categories I use. The way my brain works, I need more colors and SHADES of colors to really make the calendar work the way I want it to work for ME. It works and I've grown accustomed to the LIMITED color choices, but I don't LIKE it. I want more...and I want them for the calendars *and* events.

The current day highlight is VERY subtle.

Have many more ranges of colors thant we could define in a color rainbow to choose for the calendars, as it is the case for google clanedar or infomaniak.