No option to sign in with email. I won't link things to google or git until I know what I'm dealing with.
Perhaps a demo account providing results of Moz or Heroku or something that shows off your service nicely? Failing that some screenshots of sample results.
It's easier to spin up a temp email than fake Google a/c. If I found you on the web, until I know you're not going to mailbomb me to death (the SEO space can have this habit) I'll give the site a temp.
Even when paying I prefer to sign up with something like me+nonstop@ or me_nonstop@ so if I start getting spam to that address, I know either you a) sold, or b) got hacked. If I am getting a lot of spam, I can nuke just your email, and spin up another for your service.
I'm more than average on privacy and anti surveillance awareness, but I suspect on HN, and in the SEO and web dev spaces you'll also find more of this cynical to all things online than average. ;)
Perhaps a demo account providing results of Moz or Heroku or something that shows off your service nicely? Failing that some screenshots of sample results.