Which google font is most similar to Avenir Next Demi bold?
Though recognizable in its own right, the popular Montserrat is probably the best replacement for Avenir.
Avenir and Montserrat are both clean, geometric sans serif fonts with clean, simple letterforms and relaxed spacing. Avenir’s letterforms are a bit narrower on the whole. Since Montserrat is on Google Fonts, it’s particularly easy to use in your own project.
It’s worth noting that in uppercase, both the overall feel (Montserrat is punchy and stocky) and the unique letterforms of each (Avenir’s “Q”, Monserrat’s “G”) set the two apart a bit more.
What it’s got: 9 weights + italics
Get it at: Montserrat at Google Fonts
The clean-cut Eau is a fantastic font on its own, and a great free alternative to Avenir.
While Montserrat above is almost immediately recognizable in its own right, Eau is basically unused in the wild – and therefore makes a more interesting free alternative to Avenir.
On the whole, Eau has slightly narrower letterforms and a darker normal weight.
What it’s got: 3 weights + italics
Get it at: Eau at Font Squirrel
Other Avenir alternatives
You can also check out 3 other Avenir alternatives, along with usage notes and download links.
Jost is a good alternative, they both had their design derive from Futura and have a similair double story a. Sadly it is purely geometric and doesn't have neo-grotesk-equse letters. If you really need the lowercase T of Avenir in your alternative go use League Spartan with a alternate lowercase A and U.
Try using Identifont's Similar Font Finder: http://www.identifont.com/find?similar=Avenir+Next&q=Go