What Platform Do You Use to Send Messages?

I mostly write at my desk or sometimes, especially if I was writing like at the end of a long day, I like hop on the bed because I can have my laptop and I can see the mountains in my little desert garden. And what platform to use to send messages? ConvertKit. What do you like or not like about ConvertKit? It was easier to use than some of the ones that had more bells and whistles. But I do wish that it was easier to play with fonts and templates and ConvertKit.