What are the free analogues of the TT Prosto font?

Question

Fonts

Good afternoon, we ordered a template for the site, it was sent using a paid font
Font: www.myfonts.com/fonts/type-type/tt-prosto-sans
1. Can this font be used on the site?
2. Are there analogues of this font?
3. What other options are there? (Arial, Verdana, Times new roman - don't work at all :( )

Answer 1

1. You can, if you buy a license
2. Looks like Ubuntu Sans