One language is included
Dialgio works in your site's languages. The 12 EUR monthly fee includes 1 language, for example Romanian.
Every extra language is paid
Each extra language needs one Dialgio: extra language in help and chat, 5 EUR / month. A site in two languages therefore needs one, a site in three languages two.
The site language is a separate item
A Dialgio language is not the same as a site language. Every extra site language is the One more language on the site add-on, paid once. If Dialgio should answer in both languages of a two-language site, you need both: one One more language on the site and one Dialgio: extra language in help and chat.
Let us look at your site.
The quote form takes two minutes: package, add-ons, your company details. You see the price at once, and it commits you to nothing.