Simple Calendar

I am looking for a simple calendar that offers the possibility to mark calendar days with 3 different colors in a year or month view, so that visitors can see on which days the location can be rented, is occupied or already has an option. (see picture) Without a direct booking option, no further links, no connection of pictures etc. are necessary. But it would be perfect if the mobile view would work too.

Maybe there is already something like that, but I haven't found it yet. I'm sure some users would use it.

Thanks for your efforts!