Most smartphone messaging apps also have PC versions

Some apps, such as WhatsApp, Skype, Threema and Telegram, offer a website where you can type your messages. — dpa

Most messaging apps were created originally for use on smartphones and tablets, but their developers have since realised that sometimes there's a need to write messages on a computer.

This is especially true if one works the whole day on a desktop PC or notebook and doesn't want to be constantly picking up a smartphone.