Two questions spring to mind that are not immediately obvious from the website - how do they get access to your messages in different accounts?

Are they using some API? Or do they ask you for your username/password for each service and "helpfully" login for you?

It appears to be just a wrapper around web interfaces. Electron or some such nonsense. Truckloads of megabytes - binary size as well as memory consumption.

They pretty much wrap the website versions of the services.

Or better yet, Rambox ;)

http://rambox.pro/

Definitely checking that one out, thank you.

Franz isn't a new standard, by the look of the homepage.

Seems to be wrapping them all.