This is a very interesting example of a welcome gate/home page from Quick Sprout. Because Quick Sprout's niche is primarily SEO, they created a website analyzer...View More that points out your SEO problems. Because it doesn't look like an opt-in form & instead seems like a regular search bar, the strategy is much more under-the-radar. Notice how the button to start the analysis is not an ordinary button. Instead, it says "Log In With Google" which is also under-the-radar since many would naturally assume it's just a search button. Instead, Quick Sprout is accessing your information via the Google API. Neil Patel's company, Kissmetrics, uses the same exact strategy showcased here: http://swiped.co/url/LBkEA They present CTAs that say "Log In With Google". Once you put in your site & give access through Google, you are taken to a very informative page displaying your SEO report. They present you with several call-to-actions from there, including 2 pop-ups & an option to download a PDF.