Viral SaaS

Some of the best viral SaaS products that I've seen are really baking it into the product itself. Instead of sent via iPhone at the bottom of an email signature, you have sent via superhuman. We don't want to put ourselves out there in a way that is fundamentally editing or altering the content of our users. What we do is we just keep it very simple. You know, it's literally three words and you can turn it off if you want. It's on by default.