Erik Spiekermann is a genius. He made Fira Sans to be a total antithesis to Helvetica. Now, I like Helvetica, but I also love the pure character of Fira Sans and it’s my go-to sans serif.

Here’s a better link for Fira Sans: https://carrois.com/fira/

Also, if you have Fira Sans installed on your computer, you can use it in Slack with `/slackfont Fira Sans’